Ge Am-2.4/4.16-100/150- 3 User manual

GEH

-

2000

B

INSTRUCTIONS

AND

RENEWAL

PARTS

(

SUP

ERSEDE

9

SEH

-

2000

A

)

v

.

s

Types

AM

-

2.4

/

4.16

-

100

/

150

-

3

AM

-

2.4

/

4.16

-

100

/

150

A

-

3

AM

-

2.4

/

4.16

-

150

/

250

-

3

AM

-

2.4

/

4.16

-

150

/

250

A

-

3

IVlth

MS

-

13

Mechanism

eOECTSHTS

3

INTRODUCTION

RECEIVING

,

HANDLING

AND

STORAGE

3

.

3

DESCRIPTION

.

4

INSTALLATION

.

..

.

9

OPERATION

.

11

MAINTENANCE

..

•

..

18

RENEWAL

PARTS

.

• •

MEDIUM

VOLTAGE

SWITCHGEAR

DEPARTMENT

wm

L

GENERAL

PHILADELPHIA

,

P A

.

Courtesy of NationalSwitchgear.com

%

GEH

-

2000

Circuit

Breaker

Type

AM

T

1

*

A

1

C

I

i

,

4

in

CM

r

-

o

CM

o

CO

W

&

MM

cn

u

_

LJCGT

;

1

.

Secondary

Coupler

J

2

.

Auxiliary

Switch

3

.

Position

Indicator

4

.

Opening

Spring

Unit

5

.

Operation

Counter

6

.

Manual

Trip

'

#

7

.

Control

Device

8

.

Control

Device

Plunger

Guide

9

.

Closing

Solenoid

10

.

Plunger

Interlock

(

Optional

)

:

J

_

4

>

£

v

/

.

-

_

ni

V

smsamiai

rSi

—

itw

j

»

-

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7

~

^

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,

y

S

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:

rl

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WK

r

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i

:

-

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;

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;

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1

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•

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i

o

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-

»

T

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-

*

7

~

;

I

|

;

•

i

t

_

i

-

Fig

.

I

MS

-

13

Operating

Mechanise

wrmw

*

B

:

v

-

f

‘

ML

.

-

s

:

a

IMi

mmm

00

s

:

-

r

-

8

;

-

A

-

f

’

.

'

J

=

s

'

l

-

Si

f

.

CM

C

?

i

V

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&

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-

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mm

L

.

•

vV

-

•

.

v

3

ST

w

rtiL

«

:

»

J

'

3

XH

-

<

-

12

.

-

Y

5

#

/

CC

S

>

‘

v

-

;

^

O

2

CM

if

§

4

®

>

3

.

Handle

4

.

Release

Valve

1

.

Closing

Armature

2

.

Maintenance

Operating

Device

Method

of

Mounting

Maintenance

Operating

Device

Fig

.

2

Courtesy of NationalSwitchgear.com

MAGNE

-

BLAST

CIRCUIT

BREAKER

TYPE

AM

-

2.4

/

4.16

WITH

MS

-

13

MECHANISM

c

INTRODUCTION

interrupted

in

air

by

sufficiently

elongating

and

cooling

it

.

This

is

accomplished

by

means

of

a

strong

magnetic

field

that

lengthens

the

arc

and

forces

it

into

in

-

timate

contact

with

cool

dielectric

mater

-

given

on

the

nameplate

.

Since

this

book

is

written

to

cover

several

ratings

of

breakers

that

are

of

the

same

general

design

,

all

instructions

will

be

of

a

gen

-

eral

character

and

all

illustrations

will

be

typical

,

unless

otherwise

specified

.

The

Magne

-

blast

Circuit

Breaker

is

the

removable

interrupting

element

for

use

in

vertical

-

lift

metal

-

clad

switchgear

,

to

pro

-

vide

reliable

control

and

protection

of

power

systems

.

Among

the

many

advantages

of

metal

-

clad

switchgear

are

added

protection

to

equipment

and

personnel

,

compactness

,

simplified

installation

and

reduced

mainte

-

nance

.

In

keeping

with

these

features

the

Magne

-

blast

breakers

are

designed

for

in

-

terchangeability

and

manueverability

,

to

-

gether

with

reliability

and

low

maintenance

requirements

.

The

Magne

-

blast

Circuit

Breaker

oper

-

ates

on

the

principle

that

an

arc

can

be

ial

.

v

The

AM

-

2.4

/

4.16

Magne

-

blast

Break

-

er

is

available

in

a

number

of

current

and

voltage

ratings

.

Refer

to

the

breaker

nameplate

for

the

complete

rating

inform

-

ation

of

any

particular

breaker

.

The

short

circuit

conditions

to

be

imposed

on

the

breaker

must

not

exceed

its

rating

,

nor

should

it

be

called

upon

to

operate

at

voltages

or

currents

greater

than

those

PROPER

INSTALLATION

AND

MAIN

-

TENANCE

ARE

NECESSARY

TO

INSURE

CONTINUED

SATISFACTORY

OPERATION

OF

THE

BREAKER

.

The

following

instruc

-

tions

will

provide

complete

infomation

for

placing

the

magne

-

blast

breaker

in

ser

-

vice

and

for

maintaining

satisfactory

operation

.

RECEIVING

,

HANDLING

AND

STORAGE

Loose

parts

associated

of

the

breaker

,

with

the

breaker

are

always

included

in

the

same

crate

.

Check

all

parts

against

the

packing

list

to

be

sure

that

no

parts

have

been

overlooked

.

heaters

are

in

operation

to

prevent

condensation

.

2

.

The

breaker

should

be

stored

in

a

clean

location

,

free

from

corrosive

gases

or

fumes

;

particular

care

should

be

taken

to

protect

the

equipment

from

moisture

and

cement

dust

,

as

this

com

-

bination

has

a

very

corrosive

effect

on

many

parts

.

3

.

Machined

parts

of

the

operating

mech

-

anism

,

etc

.

,

should

be

coated

with

a

heavy

oil

or

grease

to

prevent

rusting

.

If

the

breaker

is

stored

for

any

length

of

time

,

it

should

be

inspected

periodically

to

see

that

rusting

has

not

started

and

to

insure

good

mechanical

condition

.

Should

the

breaker

be

stored

under

unfavorable

atmospheric

conditions

,

steps

should

be

taken

to

dry

out

the

breaker

before

it

is

placed

in

service

.

RECEIVING

AND

HANDLING

Each

breaker

is

carefully

inspected

and

packed

by

workmen

experienced

in

the

nroper

handling

and

packing

of

electrical

quipment

.

Immediately

upon

receipt

of

the

circuit

breaker

,

an

examination

should

be

made

for

any

damage

sustained

in

tran

-

sit

.

If

injury

or

rough

handling

is

evident

,

a

damage

claim

should

be

filed

immediately

with

the

transportation

company

and

the

nearest

General

Electric

Sales

Office

should

be

notified

.

STORAGE

It

is

recommended

that

the

breaker

be

put

into

service

immediately

in

its

per

-

manent

location

.

If

this

is

not

possible

,

the

following

precautions

must

be

taken

to

insure

the

proper

storage

of

the

breaker

:

1

.

The

breaker

should

be

carefully

pro

-

tected

against

condensation

,

preferably

by

storing

it

in

a

warm

dry

room

,

since

water

absorption

has

an

adverse

effect

on

the

insulation

parts

.

Circuit

break

-

ers

for

outdoor

metal

-

clad

switchgear

should

be

stored

in

the

equipment

only

when

power

is

available

and

the

It

is

expected

that

due

care

will

be

exer

-

cised

during

the

unpacking

and

installation

of

the

breaker

so

that

no

damage

will

occur

from

careless

or

rough

handling

,

or

from

exposure

to

moisture

or

dirt

A

nail

puller

should

be

used

to

open

the

crates

,

and

care

should

be

exercised

to

prevent

tools

from

striking

either

the

crate

or

any

part

DESCRIPTION

give

high

speed

closing

and

opening

.

The

closing

operation

is

controlled

by

the

control

device

(

7

)

.

The

control

device

also

per

-

mits

trip

free

operation

(

tripping

the

break

-

er

at

any

time

during

the

closing

operation

)

.

prevents

solenoid

pumping

(

reclosing

)

after

a

trip

free

operation

.

For

AC

closing

operation

,

rectifiers

mounted

elsewhere

in

the

metal

-

clad

unit

are

used

to

supply

the

direct

current

on

which

the

closing

coil

operates

.

The

breaker

can

be

opened

elec

-

trically

,

by

remote

control

,

or

manually

,

by

means

of

the

manual

trip

device

(

6

)

.

All

secondary

connections

from

the

breaker

to

the

metal

-

clad

unit

are

made

through

the

coupler

(

1

)

.

The

magne

-

blast

breaker

is

composed

of

two

major

parts

,

the

breaker

element

and

the

operating

mechanism

.

The

breaker

element

comprises

three

similar

pole

units

,

each

pole

unit

consisting

of

main

and

arc

-

ing

contacts

,

an

interrupter

,

and

an

enclos

-

ing

box

barrier

that

segregates

the

inter

-

rupting

units

from

each

other

to

provide

insulation

between

phases

as

well

as

from

each

phase

to

ground

.

The

primary

con

-

nections

to

the

associated

metal

-

clad

equipment

are

made

through

the

primary

disconnect

studs

.

The

MS

-

13

operating

mechanism

shown

in

Fig

.

1

is

of

the

solenoid

type

designed

to

A

positive

interlock

and

interlock

switch

are

provided

between

the

breaker

and

metal

-

clad

unit

to

prevent

the

raising

or

lowering

of

the

breaker

in

the

unit

while

in

the

closed

position

and

to

prevent

a

closing

operation

when

the

breaker

is

not

in

either

the

fully

raised

or

lowered

position

.

A

plunger

type

interlock

can

also

be

provided

to

prevent

the

closing

of

two

adjacent

breakers

at

the

same

time

or

to

operate

an

additional

auxiliary

switch

mounted

in

the

metal

-

clad

unit

.

and

The

operating

mechanism

used

on

those

breakers

designed

for

MI

-

6

metal

-

clad

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

to

provide

for

every

possible

contingency

to

be

met

in

connection

with

installation

,

operation

or

maintenance

.

Should

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

'

s

purposes

,

the

matter

should

be

referred

to

the

General

Electric

Company

.

3

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

equipment

differs

somewhat

from

those

de

-

signed

for

M

-

26

equipment

but

its

operation

principally

the

same

.

This

mechanism

is

ntrolled

by

a

relay

scheme

mounted

in

the

metal

-

clad

unit

and

a

cut

-

off

switch

located

on

the

breaker

instead

of

the

control

device

.

Two

seven

terminal

secondary

couplers

also

replace

the

one

sixteen

terminal

coup

-

ler

.

The

positive

interlock

between

the

breaker

and

metal

-

clad

unit

is

replaced

with

a

trip

interlock

that

trips

the

mech

-

anism

before

raising

or

lowering

of

the

breaker

can

be

accomplished

.

A

fork

-

type

lever

can

be

furnished

to

operate

an

aux

-

iliary

switch

mounted

in

the

metal

-

clad

unit

.

For

detailed

explanation

of

the

opera

-

tion

of

the

breaker

and

mechanism

refer

to

the

section

OPERATION

.

I

5

A

i

V

+

O

"

.

1

MiN

16

22

S I

3

\

>

\

/

4

\

5

6

cc

ac

(

O

CJ

CC

to

eg

1

.

Stationary

pritnary

Contacts

2

.

Movable

Primary

Contacts

3

.

Buffer

Block

4

.

Stationary

Arcing

Contacts

Fig

.

3

Contact

Adjustaents

5

.

Movable

Arcing

Contacts

6

.

Upper

Arc

Runner

eo

oi

LL

.

INSTALLATION

The

following

instructions

explain

the

necessary

steps

to

be

taken

before

the

breaker

is

placed

in

the

metal

-

clad

unit

.

'

"

Ms

includes

a

complete

check

of

all

of

breaker

adjustments

,

in

addition

to

uiorough

inspection

.

For

final

installa

-

tion

instructions

refer

to

any

issue

of

the

Metal

-

clad

Switchgear

Instruction

Book

,

GEH

-

1802

.

Reference

should

also

be

made

to

the

connection

diagram

that

is

furnished

with

each

unit

.

upper

arc

runner

(

6

)

without

touching

.

All

adjustments

should

be

checked

not

only

during

the

initial

installation

of

the

breaker

but

also

during

periodic

inspec

-

V

PRIMARY

CONTACT

GAP

tioas

and

whenever

it

becomes

necessary

to

repair

or

replace

parts

that

have

become

worn

or

defective

while

in

service

.

The

following

adjustments

are

listed

in

the

order

in

which

they

are

to

be

checked

.

First

,

however

,

remove

the

breaker

from

the

metal

-

clad

unit

and

remove

the

box

barrier

and

the

mechanism

cover

.

Refer

to

Fig

.

4

.

With

the

breaker

closed

,

press

the

manual

trip

button

allowing

the

breaker

to

trip

open

normally

.

Do

not

force

the

contacts

open

wider

by

hand

.

The

gap

between

the

stationary

primary

contacts

(

5

)

and

the

movable

primary

contact

(

6

)

should

be

3

-

13

/

16

"

+

1

/

8

"

-

3

/

16

"

.

To

change

this

gap

,

loosen

the

check

nut

(

25

)

,

Fig

.

5

,

and

turn

the

adjusting

nut

(

26

)

on

stud

(

9

)

.

Screwing

the

adjusting

nut

down

will

decrease

the

primary

contact

gap

.

Tighten

the

check

nut

and

remeasure

the

contact

gap

(

close

and

trip

the

breaker

before

checking

the

measurement

)

.

\

PRIMARY

CONTACT

WIPE

DO

NOT

WORK

ON

EITHER

THE

BREAKER

OR

THE

MECHANISM

WHILE

IN

THE

CLOSED

POSITION

UNLESS

THE

PROP

AND

TRIP

LATCH

HAVE

BEEN

SECURELY

WIRED

OR

BLOCKED

TO

PRE

-

VENT

ACCIDENTAL

TRIPPING

.

When

the

breaker

Is

closed

,

as

shown

in

Fig

.

3

,

the

stationary

primary

contacts

(

1

)

.

should

rise

5

/

16

"

+

0

-

l

/

l

6

"

.

To

obtain

this

adjustment

,

open

the

breaker

and

,

referring

to

Fig

.

4

,

loosen

the

check

-

TRm

T

ATPH

U

/

TDI

?

nut

(

4

)

and

turn

the

adjusting

nut

(

3

)

.

DA

1

L

WIPE

Screwing

up

on

the

adjusting

nut

will

de

-

Refer

to

Fig

.

5

.

The

wipe

of

the

trip

crease

the

primary

contact

wipe

,

down

will

latch

(

4

)

on

the

trip

roller

(

6

)

should

be

from

increase

it

.

Tighten

the

check

nut

,

close

3

/

16

"

to

1

/

4

"

.

This

can

be

measured

by

the

breaker

and

recheck

the

wipe

.

With

putting

a

film

of

grease

on

the

latch

(

4

)

,

the

primary

contact

wipe

correctly

ad

-

closing

the

breaker

part

way

,

and

trip

-

justed

.

the

clearance

between

the

contact

ping

.

The

mechanism

has

the

proper

trip

(

7

)

and

the

buffer

block

should

be

latch

wipe

when

the

latch

rests

against

the

1

/

16

"

or

greater

(

as

shown

in

Fig

.

3

)

stop

(

5

)

.

No

adjustment

is

provided

and

when

the

breaker

is

fully

closed

.

a

visual

inspection

is

usually

all

that

is

required

.

If

this

setting

is

not

correct

,

look

for

insufficient

travel

of

the

trip

shaft

(

3

)

.

ADJUSTMENTS

Although

the

breaker

has

been

com

-

pletely

adjusted

and

tested

at

the

factory

,

it

is

possible

that

unusually

rough

handling

during

transportation

may

have

caused

some

loosening

or

disturbance

of

parts

of

the

apparatus

.

It

is

therefore

advisable

to

review

all

adjustments

before

placing

the

breaker

in

service

,

making

readjustments

wherever

necessary

.

arm

ARCING

CONTACT

WIPE

Refer

to

Fig

.

3

.

Close

the

breaker

until

the

arcing

contacts

just

touch

.

This

can

be

determined

with

the

use

of

a

circuit

ISM

IN

THE

CLOSED

POSITION

,

KEEP

continuity

tester

such

as

a

light

indication

FINGERS

CLEAR

OF

THE

LINKAGE

,

AS

or

bell

set

In

this

position

,

the

gap

between

ACCIDENTAL

TRIPPING

CAN

CAUSE

SE

-

the

stationary

primary

contacts

(

1

)

and

the

VERE

INJURY

,

movable

primary

contact

(

2

)

should

be

5

/

16

”

or

greater

.

This

setting

has

been

PROP

CLEARANCE

made

in

the

factory

and

no

adjustment

is

provided

.

A

wipe

of

less

than

5

/

16

"

is

usually

an

indication

that

the

arcing

con

-

closed

as

far

as

possible

with

the

mainte

-

tacts

need

to

be

replaced

.

When

making

nance

device

,

the

clearance

between

the

this

check

,

also

see

that

the

movable

arcing

closing

(

10

)

and

the

prop

(

15

)

should

contact

(

5

)

passes

through

the

slot

in

the

be

l

/

32

"

to

3

/

32

"

.

Measure

the

prop

A

maintenance

operating

device

is

pro

-

vided

for

operation

of

the

breaker

during

these

adjustment

checks

.

Mount

the

device

as

shown

in

Fig

.

2

,

and

turn

the

release

valve

(

4

)

firmly

to

the

right

.

To

close

the

breaker

,

operate

the

handle

(

3

)

with

a

pump

-

ing

motion

.

By

turning

the

release

valve

(

4

)

to

the

left

,

the

closing

armature

will

return

to

its

normal

position

.

Electrical

operation

must

not

be

attempted

until

the

breaker

has

been

operated

manually

through

complete

stroke

several

times

and

1

installation

inspection

has

been

com

-

WHEN

WORKING

ON

THE

MECHAN

-

Refer

to

Fig

.

5

.

With

the

breaker

pieced

.

4

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Bre

Type

AM

GEH

-

2000

clearance

with

a

feeler

gage

to

determine

whether

or

not

an

adjustment

should

be

ade

,

and

if

so

,

exactly

how

much

adjust

-

ent

will

be

required

.

To

make

the

ad

-

justment

,

it

will

first

be

necessary

to

open

the

breaker

and

remove

the

maintenance

operating

device

.

Remove

the

stop

nuts

(

22

and

24

)

being

careful

not

to

drop

the

armature

(

21

)

.

Lower

the

armature

from

the

mechanism

and

remove

the

two

set

screws

(

19

)

.

Remove

the

closing

plunger

(

17

)

from

the

armature

and

add

or

subtract

the

necessary

thickness

of

shims

(

20

)

to

give

the

required

adjustment

,

then

replace

the

closing

plunger

,

screwing

it

down

against

the

shims

.

Using

a

small

drill

,

spot

the

closing

plunger

through

the

set

screw

hole

.

Replace

the

set

screws

.

To

remount

the

armature

on

the

breaker

,

compress

the

piston

ring

(

18

)

.

After

reassembly

,

re

-

mount

the

maintenance

closing

device

and

check

the

adjustment

.

CLOSING

PLUNGER

CLEARANCE

Refer

to

Fig

.

5

.

With

the

breaker

in

the

open

position

,

the

clearance

between

the

closing

plunger

roller

(

14

)

should

be

obtain

this

clearance

,

the

nuts

(

22

)

two

armature

guide

bolts

(

23

)

n

raised

or

lowered

.

Both

nuts

should

be

moved

the

same

amount

.

After

making

an

adjustment

,

close

and

open

the

breaker

and

recheck

the

plunger

clearance

.

Repeat

the

adjustment

if

necessary

.

\

o

2

00

‘

175

i

and

the

closing

16

"

to

3

/

16

"

.

To

i

on

the

may

be

o

QO

1

.

Operating

Rod

2

.

Operating

Rod

3

.

Adjusting

Nut

4

.

Check

Nut

5

.

Stationary

Primary

Contacts

6

.

Movable

Primary

Contacts

7

.

Contact

Ana

8

.

Yoke

=

t

ct

u

.

Adjustable

Coupling

for

Making

Primary

Contact

Wipe

Adjustment

Fig

.

4

1

.

Main

Oper

.

Shaft

2

.

llain

Crank

3

.

Trip

Shaft

4

.

Trip

Latch

5

.

Trip

Latch

Stop

6

.

Trip

Roller

7

.

Position

Indicator

8

.

Clevis

9

.

Adjustable

Stud

10

.

Closing

11

.

Opening

Spring

Housing

12

.

Opening

Spring

,

Inner

13

.

Opening

Spring

,

Outer

14

.

Closing

Roller

15

.

Prop

16

.

Closing

Coil

17

.

Closing

Plunger

18

.

Piston

Ring

19

.

Set

Screw

20

.

Shims

21

.

Closing

Armature

22

.

Stop

Nuts

23

.

Armature

Guide

Bolts

24

.

Stop

Nuts

25

.

Check

Nut

26

.

Adjusting

Nut

co

s

2

04

5

to

6

u

.

To

20

Y

/

//

/

A

/

//

A

21

22

23

24

Fig

.

5

Cross

Section

of

MS

-

13

Meehan

iso

5

.

t

Courtesy of NationalSwitchgear.com

<

I

2

3

I

4

5

^

1

.

Back

Auxiliary

Switch

2

.

Mounting

Screw

^

3

.

Top

Auxiliary

Switch

4

.

Plunger

5

.

Operating

Arm

6

.

Trip

Lever

7

.

Plunger

Guide

6

J

|

8

1

.

Interlock

Shaft

2

.

Latch

Check

Switch

Am

*

^

-

3

.

Latch

Checking

Switch

4

.

Trip

Shaft

5

.

Interlock

Switch

Am

v

.

6

.

Interlock

Switch

Control

Device

*

in

as

far

as

possible

.

In

this

position

the

clearance

between

the

switch

plunger

(

2

)

and

the

adjustment

screw

(

3

)

should

be

not

more

than

1

/

32

”

.

If

adjustment

is

neces

-

sary

,

add

or

remove

washers

(

4

)

as

re

-

quired

.

AUXILIARY

DEVICES

Plunger

Interlock

(

AM

-

2.4

/

4.16

-

100

/

150

-

3

and

150

/

250

-

3

)

Fig

.

6

Interlock

Switch

and

Latch

Checking

Switch

Refer

to

Fig

.

9

.

With

the

breaker

in

the

open

position

,

the

vertical

distance

"

A

"

from

the

top

of

the

interlock

bolt

(

2

)

to

the

bottom

of

the

elevating

bar

(

13

)

should

be

15

-

19

/

32

"

±

1

/

16

"

.

To

change

this

ad

-

justment

add

or

remove

washers

(

3

)

.

INTERLOCK

SWITCH

WIPE

Referring

to

Fig

.

6

,

rotate

the

interlock

shaft

(

1

)

manually

clockwise

to

release

the

interlock

switch

arm

(

3

)

.

The

point

at

which

the

contacts

make

can

be

determined

with

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

To

obtain

ad

-

justment

on

the

interlock

switch

(

6

)

,

bend

the

interlock

switch

arm

(

3

)

.

The

roller

and

crank

on

the

interlock

switch

(

6

)

should

have

1

/

32

"

to

1

/

16

"

overtravel

after

final

adjustment

.

CONTROL

DEVICE

ADJUSTMENT

Latch

Checking

Switch

Wipe

Auxiliary

Switch

Linkage

(

Furnished

Special

on

AM

-

2.4

/

4.16

-

100

/

Referring

to

Fig

.

6

,

rotate

the

trip

shaft

(

5

)

manually

clockwise

to

release

the

latch

checking

switch

arm

(

2

)

.

The

point

at

which

the

contacts

make

can

be

determined

with

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

To

obtain

adjustment

on

the

latch

checking

switch

(

4

)

,

bend

the

latch

checking

switch

arm

(

2

)

.

The

roller

and

crank

on

the

latch

checking

switch

(

4

)

should

have

1

/

32

to

1

/

16

overtravel

after

final

adjustment

150

A

-

3

and

-

150

/

25

QA

-

3

)

Refer

to

Fig

.

10

.

With

the

breaker

in

the

open

position

,

the

distance

from

the

center

line

of

the

front

bushings

(

1

)

to

the

center

of

the

slot

in

the

fork

lever

(

2

)

should

be

12

-

9

/

32

"

as

shown

.

To

change

this

setting

,

loosen

the

locking

bolts

(

3

)

and

move

the

fork

level

in

the

proper

direction

.

Tighten

the

lock

bolts

.

FINAL

INSPECTION

AND

TEST

1

.

For

ease

in

reviewing

the

adjustments

,

the

following

are

recapitulated

:

a

.

Primary

contact

wipe

:

5

/

16

"

+

0

-

1

/

16

"

.

Referring

to

Fig

.

7

,

measure

the

over

-

travel

of

the

two

auxiliary

switch

plungers

.

Manually

operate

the

control

device

by

pressing

the

operating

arm

(

5

)

the

full

extent

of

travel

to

the

rear

.

With

the

device

in

this

position

further

depress

the

plunger

(

4

)

on

the

top

auxiliary

switch

(

3

)

.

The

gap

between

the

plunger

and

operating

arm

should

be

1

/

32

"

or

greater

.

To

increase

the

overtravel

,

loosen

the

screws

(

2

)

and

move

the

switch

toward

the

rear

of

the

mounting

plate

.

Tighten

the

screws

and

recheck

the

adjustment

.

Impact

Trip

,

Current

Trip

,

Capacitor

Trip

,

and

Undervoltage

Trip

Devices

Fig

.

9

shows

the

necessary

settings

that

are

to

be

checked

when

these

devices

are

furnished

.

The

amount

of

wipe

between

the

trip

roller

(

16

)

and

the

trip

latch

(

15

)

should

be

3

/

32

"

to

5

/

32

"

.

This

can

be

altered

by

changing

the

number

of

shims

under

the

block

against

which

the

trip

plate

(

14

)

stops

.

In

order

to

trip

properly

,

the

clearance

between

the

trip

bolt

(

11

)

and

the

trip

plate

*

(

9

)

should

be

1

/

32

"

to

1

/

16

"

.

This

can

be

far

m

In

a

similar

manner

,

check

the

over

-

travel

on

the

back

auxiliary

switch

(

1

)

.

i

9

2

altered

by

releasing

the

check

nut

and

|

screwing

the

trip

bolt

(

11

)

in

or

out

of

the

i

reset

arm

(

8

)

.

^

"

'

•

2

*

When

an

undervoltage

device

is

fur

-

nished

check

the

clearance

between

the

f

?

*

'

.

trip

hammer

(

19

)

and

the

trip

plate

(

14

)

,

gy

with

the

undervoltage

coil

energized

.

This

clearance

should

be

1

/

32

"

to

1

/

16

"

and

can

be

altered

by

removing

the

connecting

at

either

end

of

the

adjusting

rod

assembly

(

20

)

,

and

turning

the

clevis

at

that

end

.

&

3

BEFORE

MANUALLY

OPERATING

THE

CONTROL

DEVICE

,

MAKE

CERTAIN

THAT

ALL

CONTROL

POWER

TO

THE

BREAKER

HAS

BEEN

DISCONNECTED

.

MANUAL

OPERATION

OF

THE

CONTROL

DEVICE

WITH

CONTROL

POWER

CON

-

NECTED

WILL

ENERGIZE

THE

CLOSING

COIL

AND

PRODUCE

A

CLOSING

OPERA

-

TION

.

4

g

ry

*

:

cm

«

3

5

H

£

a

&

.

r

CUT

-

OFF

SWITCH

ADJUSTMENTS

(

AM

-

2.4

/

4.16

-

100

/

150

A

-

3

,

-

150

/

250

A

-

3

)

Refer

to

Fig

.

8

.

With

the

breaker

in

he

open

position

,

the

clearance

between

he

switch

plunger

and

the

adjusting

screw

is

obtained

by

pushing

the

switch

plunger

(

2

)

-

1

.

Cut

-

off

Switch

2

.

Switch

Plunger

3

.

Adjusting

Bolt

4

.

Washers

5

.

Lever

Ann

After

checking

all

the

mechanical

ad

-

justments

as

outlined

above

,

operate

the

devices

manually

to

make

certain

that

they

trip

and

reset

properly

.

Fig

.

8

Cut

-

off

Switch

Adjustments

6

Courtesy of NationalSwitchgear.com

rA

*

to

2

’

'

A

«

2

37

si

3

V

4

'

V

/

*

M

/

4

X

3

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

2

3

!

'

>

1

.

Front

Disconnect

Stud

2

.

Plunger

Interlock

Bolt

3

.

Washers

4

.

Connecting

Rod

5

.

Reset

Plate

6

.

Reset

Roller

7

.

Main

Operating

Shaft

8

.

Reset

Arts

9

.

Trip

Plate

10

.

Spring

11

.

Trip

Bolt

12

.

Clevis

13

.

Elevating

Bar

14

.

Impact

Trip

Plate

15

.

Trip

Latch

16

.

Trip

Roller

17

.

Trip

Armature

18

.

Trip

Lever

19

.

Undervoltage

Trip

Hamer

20

.

Adjusting

Rod

21

.

Manual

Trip

Button

22

.

Trip

Setting

Plate

23

.

Undervoltege

Device

{

!

4

-

3

.

14

15

&

i

*

16

i

•

nTO

*

17

18

\

&

o

IS

!

C

HTO

;

C

.

0

20

10

m

i

o

11

-

o

c

2

12

-

23

X

13

=

f

S

as

to

i

at

Fig

.

9

Adjustments

On

Current

Trip

Device

and

Undervoltage

Trip

Device

,

Show

With

The

Breaker

In

The

Closed

Position

c

*

u

_

2

3

4

5

6

4

.

See

that

all

bearing

surfaces

of

the

mechanism

have

been

lubricated

.

Refer

to

the

section

on

LUBRICATION

.

5

.

Operate

the

breaker

slowly

with

the

maintenance

closing

device

and

note

that

there

is

no

excessive

binding

or

friction

and

that

the

breaker

can

be

moved

to

the

fully

opened

and

fully

closed

positions

.

6

.

See

that

any

place

where

the

surface

of

the

paint

has

been

damaged

during

installation

is

repainted

immediately

.

HI

-

POTENTIAL

TEST

If

the

breaker

had

been

stored

for

a

long

period

of

time

,

it

is

recommended

that

the

insulation

be

checked

before

the

breaker

is

placed

in

service

.

A

standard

60

cycle

high

potential

test

at

14

,

000

volts

RMS

will

normally

indicate

whether

the

breaker

is

satisfactory

for

service

.

With

the

breaker

contacts

in

the

fully

opened

position

,

apply

the

high

potential

to

each

terminal

of

the

breaker

individually

for

one

minute

with

all

other

terminals

and

the

breaker

frame

grounded

.

After

high

potential

tests

are

made

on

organic

insulating

materials

,

these

materials

should

be

inspected

for

visible

leakage

current

paths

,

and

necessary

action

must

be

taken

to

replace

insulation

that

may

have

been

affected

by

moisture

absorption

.

The

high

potential

test

is

also

recommended

for

breakers

which

have

been

removed

from

service

and

stored

over

an

extended

period

of

time

under

unfavorable

atmospheric

conditions

.

I

1

.

Front

Bushing

2

.

Fork

Lever

3

.

Locking

Bolts

4

.

5

.

Link

6

.

Rod

i

,

s

V

CO

I

\

f

OJ

n

i

If

f

8

f

\

<

£

>

O

ai

Fig

.

10

Auxiliary

Switch

Linkage

u

_

b

.

Arcing

contact

wipe

:

5

/

16

”

or

greater

(

gap

at

primary

contacts

)

.

c

.

Primary

contact

gap

:

3

-

13

/

16

+

1

/

8

"

-

3

/

16

"

.

d

.

Trip

latch

wipe

:

3

/

16

"

to

1

/

4

"

with

trip

latch

resting

against

stop

.

1

/

16

"

±

1

/

32

"

.

1

/

16

"

k

.

Impact

trip

roller

wipe

:

1

/

8

"

t

1

/

32

"

.

l

.

Impact

trip

bolt

clearance

:

3

/

64

"

±

1

/

64

"

.

m

.

Undervoltage

trip

hammer

clear

-

1

/

64

"

.

n

.

Plunger

interlock

(

100

/

150

-

3

and

150

/

250

-

3

)

:

15

-

19

/

32

"

+

1

/

16

"

.

ance

:

3

/

64

"

+

e

.

Prop

clearance

:

f

.

Closing

plunger

clearance

:

to

3

/

16

”

.

g

.

Interlock

switch

wipe

:

1

/

16

"

min

.

o

.

Auxiliary

switch

linkage

(

100

/

150

A

-

3

and

150

/

250

A

-

3

)

:

12

-

9

/

32

"

.

2

.

Check

all

nuts

,

washers

,

bolts

,

cotter

pins

,

and

terminal

connections

for

tightness

.

h

.

Control

device

switch

overtravel

:

1

/

32

"

min

.

i

.

Cut

-

off

switch

overtravel

:

1

/

32

"

max

.

j

.

Latch

checking

switch

wipe

:

1

/

16

"

min

.

AUXILIARY

DEVICES

3

.

Inspect

all

wiring

to

make

sure

that

no

damage

has

resulted

during

in

-

stallation

,

and

test

for

possible

grounds

or

short

circuits

.

On

breakers

that

are

equipped

with

auxiliary

devices

such

as

a

current

trip

,

undervoltage

trip

or

capacitor

trip

,

the

device

should

be

checked

for

proper

7

•

i

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

electrical

operation

.

The

current

trip

de

-

vice

should

trip

the

breaker

at

3

amperes

.

The

undervoltage

trip

device

should

trip

the

breaker

when

the

control

voltage

drops

below

30

to

60

%

of

rated

voltage

,

and

it

should

pick

up

at

80

%

of

the

control

volt

-

age

or

less

.

An

adjustment

plate

is

pro

-

vided

on

the

front

of

the

undervoltage

trip

device

as

an

aid

in

obtaining

the

desired

setting

.

NOTE

:

When

checking

the

pick

-

up

value

of

the

undervoltage

device

,

apply

a

voltage

equal

to

80

%

of

normal

control

voltage

to

the

undervoltage

device

coil

.

The

device

should

pick

up

at

this

value

.

Do

not

increase

the

voltage

gradually

on

this

coil

as

it

will

overheat

the

coil

,

producing

a

false

reading

,

and

may

damage

the

coil

if

excessive

over

-

heating

occurs

.

The

capacitor

trip

should

be

capable

of

tripping

the

breaker

as

late

as

25

seconds

after

the

control

voltage

is

removed

.

If

the

auxiliary

devices

do

not

perform

in

accordance

with

these

specifications

,

a

careful

examination

should

be

made

for

defective

parts

.

CONTROL

POWER

CHECK

After

the

breaker

has

been

closed

and

opened

slowly

several

times

with

the

maintenance

closing

device

,

and

the

mech

-

anism

adjustments

checked

as

described

above

,

the

operating

voltages

should

be

checked

at

the

closing

coil

and

trip

coil

terminals

.

For

electrical

operation

of

the

breaker

,

the

control

power

may

be

either

an

alternating

or

direct

current

source

.

The

operating

ranges

for

the

closing

and

tripping

voltages

are

given

on

the

breaker

nameplate

.

Ordinarily

,

standard

ranges

apply

which

are

as

follows

:

4

5

6

CM

8

oi

u

_

%

1

.

Shunting

and

Anti

-

Pusnp

Switch

*

2

.

Seal

-

in

Switch

*

3

.

Operating

Coil

4

.

Crank

5

.

Stationary

Contact

Assembly

6

.

Movable

Contact

Assembly

7

.

Arm

8

.

Arc

Chute

9

.

Trip

Lever

10

.

Plunger

Guide

Fig

.

II

Control

Device

CLOSING

RANGE

NOMINAL

VOLTAGE

TRIPPING

RANGE

125

V

.

d

-

C

250

V

.

d

-

c

230

V

.

a

-

c

90

-

130

V

.

d

-

c

180

-

260

V

.

d

-

c

190

-

250

V

.

a

-

c

70

-

140

V

.

d

-

c

140

-

280

V

.

d

-

c

190

-

250

V

.

a

-

c

CO

§

8

When

repetitive

operation

is

re

-

NOTE

:

quired

from

a

direct

current

source

,

the

closed

circuit

voltage

at

the

closing

coil

should

not

exceed

115

V

.

d

-

c

and

230

V

.

d

-

c

at

the

nominal

voltages

of

125

V

.

d

-

c

and

250

V

.

d

-

c

respectively

.

CO

9

i

10

CM

I

ca

For

a

-

c

operation

,

two

copper

-

oxide

rectifiers

,

mounted

elsewhere

in

the

metal

-

clad

unit

,

are

used

.

A

tapped

resistor

is

provided

in

each

rectifier

circuit

to

control

the

d

-

c

voltage

.

The

resistor

setting

should

be

adjusted

so

that

the

closed

circuit

volt

-

age

at

the

breaker

closing

coil

terminals

is

110

to

120

volts

d

-

c

.

Where

repetitive

operation

is

set

at

105

to

(

2

u

_

13

14

required

,

the

voltage

should

be

115

volts

d

-

c

.

/

V

/

A

Resistor

Setting

,

Ohms

*

a

-

c

Volts

(

Closed

Circuit

)

Winter

Summer

1

/

4

0

190

-

196

194

-

206

204

-

216

214

-

226

224

-

236

234

-

246

244

-

250

1

.

Main

Crank

2

.

Trip

Latch

3

.

Trip

Roller

4

.

Closing

Roller

5

.

Piston

Ring

6

.

Closing

Armature

7

.

Armature

Guide

Bolts

8

.

Spring

Retainer

9

.

Opening

Spring

,

Inner

10

-

Opening

Spring

,

Outer

11

.

Closing

12

.

Prop

13

.

Closing

Coil

14

.

Qosing

Plunger

Rod

1

/

2

0

1

/

4

1

/

2

1

/

4

3

/

4

1

/

2

1

-

1

/

4

1

-

1

/

4

3

/

4

1

*

a

-

c

Volts

as

measured

across

the

rec

-

tifier

and

a

-

c

series

resistor

.

Fig

.

12

Cross

Section

of

MS

-

13

Operating

Mechanism

in

the

Open

position

8

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

The

a

guide

•

articular

combination

of

ambient

temper

-

ture

and

a

-

c

supply

voltage

.

Summer

set

-

tings

are

used

where

ambient

temperatures

are

normally

above

freezing

(

32

°

F

)

.

It

is

necessary

to

use

winter

settings

where

the

ambient

temperature

may

drop

to

20

°

F

or

less

at

any

time

,

explanation

of

copper

-

oxide

rectifiers

for

circuit

breaker

application

,

refer

to

In

-

struction

Book

GEI

-

11306

.

preceding

tabulation

is

included

as

for

adjusting

the

resistors

for

the

and

read

the

d

-

c

voltage

at

the

closing

coil

terminals

.

relay

to

de

-

energize

the

circuit

.

required

to

close

simultaneously

,

the

closed

circuit

voltage

at

the

closing

coil

of

each

breaker

must

fall

within

the

specified

limits

.

Release

the

closing

DO

NOT

MAINTAIN

VOLTAGE

ON

THE

CLOSING

COIL

ANY

LONGER

THAN

THE

FEW

SECONDS

REQUIRED

TO

READ

THE

VOLTMETER

.

These

coils

are

designed

for

intermittent

operation

and

will

be

damaged

by

prolonged

current

flow

.

Electrical

closing

or

opening

is

ac

-

complished

by

merely

energizing

the

closing

or

trip

coil

circuit

.

Control

switches

are

provided

for

this

purpose

on

the

metal

-

clad

unit

.

It

is

also

possible

to

trip

the

breaker

manually

by

pressing

the

manual

trip

button

(

6

)

,

Fig

.

1

.

For

a

more

detailed

If

the

closed

circuit

voltage

at

the

ter

-

minals

of

the

closing

coil

does

not

fall

in

the

specified

range

,

proceed

as

follows

:

To

check

the

d

-

c

voltage

at

the

closing

coil

terminals

,

proceed

as

follows

:

When

all

the

foregoing

inspection

de

-

tails

have

been

checked

,

the

breaker

may

be

safely

placed

in

service

.

Before

the

breaker

is

finally

raised

into

position

in

the

metal

-

clad

unit

,

rub

a

small

amount

of

G

.

E

.

Contact

Lubricant

D

50

H

28

on

the

silvered

portion

of

the

breaker

studs

to

form

a

thin

coating

for

contacting

purposes

.

1

.

a

-

c

control

power

source

-

Decrease

the

series

resistance

to

increase

the

d

-

c

voltage

,

or

increase

the

series

re

-

sistance

to

decrease

the

d

-

c

voltage

.

Recheck

voltage

at

the

closing

coil

.

2

.

d

-

c

control

power

source

-

Check

volt

-

age

at

the

source

of

power

and

line

drop

between

the

power

source

and

breaker

.

1

.

Mechanism

with

a

control

device

,

Fig

.

Close

the

breaker

by

manually

operating

the

control

device

.

Hold

the

contacts

in

the

closed

position

and

read

the

d

-

c

voltage

at

the

closing

coil

ter

-

minals

.

release

the

control

device

.

11

.

To

de

-

energize

the

circuit

,

NOTE

:

This

breaker

mechanism

com

-

bination

is

designed

only

for

electrical

closing

when

in

use

.

NEVER

ATTEMPT

MANUAL

CLOSING

WITH

THE

BREAKER

IN

SERVICE

,

for

under

such

conditions

,

sufficient

closing

force

and

speed

cannot

be

applied

.

2

.

Mechanism

with

cut

-

off

switch

,

Fig

.

8

.

Close

the

breaker

by

manually

oper

-

ating

the

control

relay

located

in

the

metal

-

clad

unit

.

Hold

the

relay

closed

When

two

or

more

breakers

,

operating

from

the

same

control

power

source

,

are

OPERATION

CLOSING

OPERATION

the

trip

coil

,

the

trip

plunger

rotates

the

trip

latch

(

2

)

,

Fig

.

12

,

causing

the

oper

-

ating

mechanism

linkage

to

collapse

.

The

energy

stored

in

the

opening

springs

(

9

and

10

)

is

thus

released

,

opening

the

breaker

.

During

this

operation

,

the

trip

coil

circuit

is

de

-

energized

,

and

upon

completion

of

the

opening

operation

,

the

operating

mechan

-

ism

is

returned

to

its

normal

position

,

ready

for

closing

.

allowing

the

armature

to

return

by

gravity

to

its

original

position

.

The

control

device

plunger

also

mechanically

trips

the

seal

-

in

switch

,

de

-

energizing

the

control

device

coil

if

the

closing

control

switch

is

not

closed

.

If

the

closing

control

switch

is

held

in

the

closed

position

throughout

and

after

the

breaker

closing

operation

,

the

control

de

-

vice

linkage

will

remain

picked

up

and

be

unable

to

reset

to

prepare

for

another

breaker

closing

operation

.

This

arrange

-

ment

insures

that

"

pumping

"

of

the

breaker

will

not

occur

during

a

trip

-

free

oper

-

ation

.

The

closing

operation

of

the

breaker

is

primarily

controlled

by

the

control

device

,

Fig

.

11

,

mounted

on

the

operating

chanism

.

The

closing

sequence

is

in

-

ated

from

a

control

switch

mounted

on

the

door

of

the

metal

-

clad

unit

or

at

a

.

re

-

mote

operating

station

.

Operation

of

the

closing

control

switch

energizes

the

pick

-

up

coil

of

the

control

device

.

As

the

control

device

closes

,

seal

-

in

contacts

shunt

the

closing

control

switch

to

allow

the

opening

of

the

closing

control

switch

contacts

without

affecting

the

overall

closing

operation

.

This

type

of

arrangement

assures

complete

clos

-

ing

of

the

breaker

with

only

momentary

contact

of

the

closing

control

switch

.

As

the

breaker

opens

,

the

main

con

-

tacts

part

first

,

shunting

the

current

through

the

arcing

contacts

.

An

arc

forms

as

the

arcing

contacts

part

.

See

Fig

.

13

.

As

the

movable

arcing

contact

(

27

)

is

withdrawn

through

the

slot

in

the

arc

runner

,

the

upper

end

of

the

arc

is

transferred

to

the

upper

arc

runner

(

4

)

.

To

assist

the

interruption

at

this

point

,

a

stream

of

air

is

emitted

from

the

booster

tube

(

28

)

and

forces

the

arc

onto

the

lower

arc

runner

(

10

)

.

Estab

-

lishment

of

the

arc

on

the

runners

auto

-

matically

inserts

the

blowout

coils

into

the

circuit

,

introducing

a

magnetic

field

between

the

pole

pieces

which

tends

to

draw

the

arc

away

from

the

arcing

contacts

.

The

250

MVA

interrupter

contains

one

upper

mag

-

netic

blowout

coil

and

one

lower

blowout

coil

,

each

individually

connected

in

series

with

its

respective

arc

runner

.

The

arc

is

forced

outward

along

the

diverging

arc

runners

by

the

magnetic

field

.

The

operating

sequence

for

breakers

designed

for

MI

-

6

metal

-

clad

equipment

is

similar

to

that

described

above

except

that

a

relay

mounted

elsewhere

in

the

metal

-

clad

unit

replaces

the

control

device

.

Also

,

a

cut

-

off

switch

(

Fig

.

8

)

is

used

to

replace

the

mechanical

trip

arrange

-

ment

of

the

control

device

.

The

cut

-

off

switch

energizes

an

auxiliary

relay

to

de

-

energize

the

main

relay

.

The

closing

speed

of

the

arcing

contact

should

be

7

to

10

feet

per

second

for

the

100

/

150

MVA

breakers

and

9

to

12

feet

per

second

for

the

150

/

250

MVA

breakers

with

rated

closed

circuit

voltage

at

the

closing

coil

terminals

,

the

average

speed

of

the

movable

arcing

contact

from

a

point

1

"

before

the

tip

is

tangent

to

the

lower

surface

of

the

upper

arc

runner

to

the

tangent

position

.

those

Operation

of

the

control

device

ener

-

gizes

the

breaker

closing

coil

by

closing

the

main

control

device

contacts

(

5

and

6

)

,

Fig

.

11

.

Once

the

control

device

contacts

are

picked

up

,

they

are

electrically

held

in

the

closed

position

until

the

breaker

closing

operation

is

completed

.

Energizing

the

breaker

closing

coil

raises

the

armature

(

6

)

,

Fig

.

12

which

in

turn

lifts

the

closing

roller

(

4

)

through

plunger

(

14

)

.

is

transmitted

through

the

mechanism

link

-

age

and

rotates

the

main

crank

(

1

)

,

closing

the

breaker

contacts

.

As

the

armature

reaches

the

end

of

its

travel

,

the

prop

(

12

)

rotates

beneath

the

(

11

)

latching

the

breaker

in

the

closed

position

.

During

the

operation

,

the

opening

springs

(

9

are

compressed

in

readiness

for

an

This

motion

These

speeds

represent

closing

and

10

)

opening

operation

.

Air

trapped

above

the

armature

acts

as

a

dashpot

to

absorb

the

energy

of

the

mechanism

as

it

approaches

the

end

of

its

stroke

.

At

the

same

time

,

the

arc

is

being

forced

into

the

arc

chute

(

8

)

which

is

com

-

posed

of

a

series

of

gradually

interleaving

insulating

fins

.

These

fins

,

which

project

alternately

from

the

two

opposite

inner

surfaces

of

the

chute

,

elongate

the

arc

into

a

gradually

deepening

serpentine

path

,

so

that

the

electrical

resistance

in

the

paUi

of

the

arc

is

rapidly

increased

and

the

heat

from

the

arc

is

absorbed

.

The

increased

resistance

reduces

both

the

magnitude

and

OPENING

OPERATION

An

electrical

opening

operation

is

in

-

itiated

by

energizing

the

trip

coil

.

This

is

accomplished

either

by

actuating

the

opening

control

switch

on

the

metal

-

clad

unit

or

by

a

combination

of

relays

and

cur

-

rent

devices

used

to

detect

a

fault

on

the

load

side

of

the

breaker

.

By

energizing

Slightly

before

tlje

mechanism

latches

,

control

device

plunger

(

5

)

,

Fig

.

23

,

lanically

trips

the

main

control

device

.

acts

,

de

-

energizing

the

closing

coil

and

9

i

t

Courtesy of NationalSwitchgear.com

t

%

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

14

15

16

I

—

17

$

2

-

<

0

O

3

18

CM

5

19

CO

©

1

u

.

-

20

4

21

5

-

2 2

6

23

24

8

25

26

—

27

9

28

29

10

L

.

+

.

W

II

\

I

30

12

I

\

I

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I

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]

I

13

I

J

-

f

\

o

/

Operating

Rod

Stationary

Primary

Contacts

Movable

Primary

Contacts

Cup

Bearing

Yoke

Movable

Contact

Arm

Assembly

Movable

Arcing

Contact

Booster

Tube

Connection

Bar

Booster

Cylinder

and

Piston

21

.

11

.

Blow

-

out

Coil

12

.

Blow

-

out

Core

13

.

Muffler

14

.

Front

Bushings

15

.

Rear

Bushings

16

-

Frame

17

.

Operating

Crank

18

.

Upper

Horizontal

Barrier

19

.

Spring

Retainer

20

.

Lower

Horizontal

Barrier

Box

Barrier

Handle

Blow

-

out

Core

Blow

-

out

Coil

Arc

Runner

Pole

Piece

Stationary

Arcing

Contact

Box

Barrier

Arc

Chute

Pole

Piece

Arc

Runner

1

.

22

.

2

.

23

.

3

.

24

.

4

.

25

.

S

.

26

.

6

.

27

.

7

.

28

.

8

.

29

.

9

.

30

.

10

.

Fig

.

13

Cross

Section

Of

Breaker

Pole

Unit

10

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

the

phase

angle

of

the

current

,

early

current

zero

the

arc

path

and

the

gases

produced

by

the

arc

so

cooled

that

the

arc

cannot

re

-

establish

itself

,

and

interruption

occurs

.

TRIP

FREE

OPERATION

and

at

an

is

so

long

cedure

except

that

instead

,

of

energizing

the

trip

circuit

,

the

manual

trip

(

6

)

,

Fig

.

1

,

is

used

.

c

If

the

trip

coil

circuit

is

energized

while

the

breaker

is

closing

,

the

trip

plunger

will

force

the

trip

latch

(

2

)

,

Fig

.

12

,

away

from

the

trip

roller

(

3

)

causing

the

mecha

-

nism

linkage

to

collapse

and

the

breaker

to

re

-

open

.

The

closing

armature

(

6

)

com

-

pletes

its

closing

stroke

,

but

the

closing

coil

is

de

-

energized

at

the

end

of

the

stroke

,

and

the

armature

is

returned

to

its

original

position

by

gravity

.

The

opening

speed

of

the

arcing

con

-

tact

should

be

12

to

18

feet

per

second

at

rated

control

voltage

.

This

speed

repre

-

sents

the

average

speed

over

3

”

from

the

point

when

the

tip

on

the

movable

arcing

contact

is

tangent

to

the

lower

surface

of

the

upper

runner

.

The

150

MVA

interrupter

Is

essentially

the

same

as

the

250

MVA

interrupter

except

that

it

utilizes

the

magnetic

elements

in

the

upper

runner

only

.

Manual

tripping

follows

the

same

pro

-

MAINTENANCE

Dependable

service

and

safer

power

equipment

are

contingent

upon

the

unfailing

performance

of

the

power

circuit

breaker

.

To

maintain

such

service

,

it

is

recommend

-

ed

that

a

definite

inspection

and

main

-

tenance

schedule

be

set

up

and

followed

,

as

serious

shutdowns

can

often

be

avoided

by

locating

potential

sources

of

trouble

in

an

early

stage

.

A

periodic

lubrication

of

parts

subject

to

wear

is

also

vitally

im

-

portant

for

the

successful

operation

of

the

breaker

.

3

.

BUSHINGS

AND

INSULATION

The

surface

of

the

Self

-

X

bushings

should

be

kept

clean

and

unmarred

to

prevent

moisture

absorption

.

If

the

insulation

sur

-

face

should

become

damaged

,

it

should

be

sanded

and

cleaned

,

and

should

be

refinished

with

either

clear

varnish

(

GE

-

1170

)

or

clear

*

Glyptal

resin

(

GE

-

1202

)

.

Allow

to

dry

smooth

and

hard

.

All

other

insulation

parts

on

the

breaker

should

be

kept

clean

and

dry

.

Smoke

or

dust

collected

between

inspection

periods

should

be

wiped

off

,

and

if

dampness

is

apparent

,

heaters

should

be

installed

to

insure

dryness

.

If

the

arc

chute

has

suffered

any

mechanical

injury

due

to

dropping

or

accidental

striking

,

resulting

in

the

actual

breaking

off

of

fins

,

replace

-

ment

of

the

chute

will

be

necessary

.

BREAKER

CONTACTS

By

removing

the

box

barrier

the

mov

-

able

and

stationary

primary

contacts

and

the

movable

arcing

contacts

can

be

in

-

spected

.

The

stationary

arcing

contacts

can

be

inspected

only

after

removing

the

arc

chute

assembly

,

as

explained

under

REPAIR

AND

REPLACEMENT

.

If

the

con

-

tacts

are

burned

or

pitted

,

they

should

be

made

smooth

with

a

fine

file

.

After

completing

inspection

of

the

con

-

tacts

,

check

the

contact

adjustments

as

specified

under

INSTALLATION

,

ADJUST

-

MENTS

.

BEFORE

ANY

MAINTENANCE

WORK

IS

PERFORMED

,

MAKE

CERTAIN

THAT

ALL

CONTROL

CIRCUITS

ARE

OPENED

AND

THAT

THE

BREAKER

IS

REMOVED

FROM

THE

METAL

-

CLAD

UNIT

.

DO

NOT

WORK

ON

THE

BREAKER

OR

MECHA

-

NISM

WHILE

IN

THE

CLOSED

POSITION

UNLESS

THE

PROP

AND

TRIP

LATCH

HAVE

BLOCKED

TO

PREVENT

ACCIDENTAL

TRIPPING

.

LUBRICATION

In

order

to

maintain

reliable

operation

it

is

important

that

all

circuit

breakers

be

properly

lubricated

at

all

times

.

During

assembly

at

the

factory

,

all

bearing

sur

-

faces

,

machined

surfaces

,

and

all

other

parts

of

the

breaker

and

mechanism

subject

to

wear

have

been

properly

lubricated

using

the

finest

grade

of

lubricants

avail

-

able

.

However

,

even

the

finest

oils

and

greases

have

a

tendency

to

oxidize

with

age

,

as

evidenced

by

hardening

and

darken

-

ing

in

color

.

Elimination

of

the

hardened

lubricant

is

essential

for

the

proper

opera

-

tion

of

circuit

breakers

.

Also

frequent

operation

of

the

breaker

causes

the

lubri

-

cant

to

be

forced

out

from

between

the

bearing

surfaces

.

A

simple

lubrication

will

often

clear

up

minor

disturbances

which

might

be

mistakenfor

more

serious

trouble

.

BEEN

SECURELY

WIRED

OR

MECHANISM

PERIODIC

INSPECTION

The

frequency

of

periodic

inspection

should

be

determined

by

each

operating

company

on

the

basis

of

the

number

of

operations

(

including

switching

)

,

the

magni

-

tude

of

currents

interrupted

,

and

any

un

-

usual

operations

which

occur

from

time

to

time

.

Operating

experience

will

soon

establish

a

maintenance

schedule

which

will

give

assurance

of

proper

breaker

con

-

dition

.

tion

of

fault

duty

and

repetitive

operation

is

encountered

,

an

inspection

is

recom

-

mended

after

any

severe

fault

operation

.

The

following

instructions

list

the

main

points

to

be

included

in

an

inspection

,

and

a

number

of

general

recommendations

.

ARC

CHUTES

It

is

not

necessary

to

inspect

the

arc

chutes

unless

there

is

evidence

of

damage

or

if

the

arc

chutes

are

removed

for

any

reason

.

When

inspecting

an

arc

chute

,

it

should

be

disassembled

and

the

following

points

noted

:

Scale

formed

over

the

surface

of

the

arc

chute

must

not

be

removed

,

but

loose

particles

collected

in

the

chute

should

be

blown

out

.

2

.

Cracks

which

have

formed

in

the

fins

of

the

arc

chute

are

to

be

expected

in

ceramic

materials

of

this

type

when

subjected

to

the

severe

heat

of

an

arc

.

These

cracks

do

not

interfere

with

the

operation

of

the

device

in

any

way

and

should

be

disregarded

.

A

careful

inspection

should

be

made

to

check

for

loose

nuts

or

bolts

and

broken

retaining

rings

.

All

cam

,

roller

,

and

latch

surfaces

should

be

inspected

for

any

evidence

of

damage

or

excessive

wear

.

Lubricate

the

mechanism

as

outlined

below

,

then

,

using

the

maintenance

operating

de

-

vice

,

open

and

close

the

breaker

several

times

to

make

certain

that

the

mechanism

operates

freely

throughout

its

entire

stroke

.

Check

the

mechanism

adjustments

as

speci

-

fied

under

INSTALLATION

,

ADJUST

-

MENTS

.

Check

all

terminal

connections

.

On

installations

where

a

combina

-

Alternative

Lubrication

(

Requires

Disassembly

)

Lubrication

at

Maintenance

Period

Part

Ground

surfaces

such

as

cams

,

rollers

,

latches

,

etc

.

Sleeve

Bearings

(

Mechanism

and

Breaker

linkage

)

Wipe

clean

and

apply

D

50

H

15

.

Wipe

clean

and

apply

D

50

H

15

.

Very

light

application

of

light

machine

oil

SAE

-

20

or

-

30

.

Remove

pins

and

links

and

clean

as

per

the

following

cleaning

instructions

.

Apply

D

50

H

15

liberally

.

Clean

as

per

the

following

cleaning

instructions

and

repack

with

D

50

H

15

.

Wipe

clean

and

apply

D

50

H

28

.

Removable

Seal

and

Open

Type

Ball

,

Roller

and

Needle

Bearings

Silver

Plated

Contacts

and

Primary

Disconnect

Studs

.

Light

application

of

light

machine

oil

SAE

-

20

or

-

30

.

1

.

Wipe

clean

and

apply

D

50

H

28

.

Wipe

clean

and

apply

D

50

H

15

.

(

No

lubrication

is

required

on

the

loose

rings

between

bush

-

ing

and

contact

arm

)

.

Cup

Bearing

No

lubrication

re

-

quired

.

Fig

.

14

Lubrication

Chart

11

Reg

.

Trade

-

Mark

of

General

Electric

Co

.

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

BIast

Circuit

Breaker

Type

AM

If

it

is

desirable

to

leave

the

5

.

Damaged

control

device

coil

.

REMEDY

:

Replace

damaged

coil

.

6

.

Damaged

closing

coil

.

REMEDY

:

Replace

damaged

coil

.

Esso

Anti

-

7

.

Defective

cut

-

off

switch

,

latch

-

check

-

ing

switch

,

or

interlock

switch

.

REMEDY

:

Replace

defective

switch

.

8

.

Blown

fuse

in

closing

circuit

.

REMEDY

:

Replace

blown

fuse

after

determining

cause

of

failure

.

9

.

Faulty

connections

in

closing

circuit

.

REMEDY

:

Repair

broken

or

loose

wires

and

see

that

all

binding

screws

are

tight

.

10

.

Insufficient

control

voltage

caused

by

excessive

drop

in

leads

.

REMEDY

:

Install

larger

wires

and

improve

electrical

contact

at

connec

-

tions

.

A

definite

lubrication

schedule

should

be

set

up

taking

into

consideration

the

fre

-

quency

of

operation

of

the

breaker

and

local

conditions

.

Until

such

a

schedule

is

worked

out

,

the

breaker

should

be

lubricated

at

each

periodic

inspection

and

also

whenever

it

is

overhauled

,

in

accordance

with

the

lubrication

chart

,

Fig

.

14

.

It

is

also

recom

-

mended

that

all

circuit

breakers

be

operated

!

at

regular

intervals

to

insure

the

user

that

the

equipment

is

operating

freely

.

The

lubrication

chart

(

Fig

.

14

)

is

divided

into

two

methods

of

lubrication

.

The

first

method

outlines

the

maintenance

lubrication

which

should

be

performed

at

the

time

of

periodic

maintenance

,

and

re

-

quires

no

disassembly

.

The

second

method

outlines

a

lubrication

procedure

similar

to

that

performed

on

the

breaker

at

the

factory

,

but

should

be

used

only

in

case

of

a

general

overhaul

or

disassembly

for

other

reasons

,

or

if

the

operation

of

the

breaker

becomes

slower

.

hours

.

bearings

in

the

alcohol

for

a

longer

time

,

an

inhibited

alcohol

such

as

is

used

for

anti

-

freeze

should

be

used

.

Even

then

the

bearings

should

be

removed

from

the

alcohol

within

twenty

-

four

hours

.

Freeze

and

Du

Pont

Zerone

are

satis

-

factory

for

this

purpose

,

against

the

toxic

effects

of

the

alcohol

must

be

exercised

by

wearing

rubber

gloves

and

by

using

the

alcohol

in

a

well

ventilated

room

;

excessive

exposure

to

the

fumes

is

sometimes

unpleasant

to

personnel

.

Wash

-

ing

the

bearings

in

light

oil

and

draining

should

follow

immediately

then

apply

the

lubricant

.

-

J

Precautions

TROUBLE

SHOOTING

Failure

of

a

breaker

to

operate

properly

will

generally

fall

within

three

general

classes

:

Failure

to

trip

,

failure

to

close

or

latch

closed

,

and

overheating

,

following

is

a

brief

outline

showing

parti

-

cular

types

of

distress

that

might

be

en

-

countered

,

together

with

suggestions

for

remedying

the

trouble

:

FAILURE

TO

TRIP

The

11

.

Insufficient

control

voltage

caused

by

poor

regulation

(

a

-

c

control

)

.

REMEDY

:

Install

larger

control

transformer

.

Check

rectifier

to

be

sure

it

is

delivering

adequate

d

-

c

supply

.

Mechanism

binding

or

sticking

caused

OVERHEATING

by

lack

of

lubrication

.

REMEDY

:

Lubricate

complete

mecha

-

1

.

nism

.

General

Electric

Lubricant

D

50

H

15

and

D

50

H

28

are

available

in

1

/

4

#

collapsible

tubes

.

It

is

so

packaged

to

insure

cleanliness

and

to

prevent

oxidation

.

METHOD

OF

CLEANING

BEARINGS

1

.

Wherever

cleaning

is

required

,

as

in

-

dicated

in

the

lubrication

chart

,

the

follow

-

ing

procedures

are

recommended

:

Sleeve

Bearings

Poor

condition

of

contacts

due

to

lack

of

attention

after

severe

duty

or

too

frequent

operation

.

REMEDY

:

burned

and

pitted

contacts

.

(

Contacts

should

be

reconditioned

very

carefully

and

only

when

absolutely

necessary

)

.

Contacts

not

properly

aligned

or

ad

-

justed

.

REMEDY

:

Check

all

adjustments

in

accordance

with

INSTALLATION

,

AD

-

JUSTMENTS

.

2

.

Mechanism

binding

or

sticking

caused

by

being

out

of

adjustment

.

REMEDY

:

Check

all

mechanism

ad

-

justments

,

latches

,

stops

,

auxiliary

devices

,

etc

.

,

in

accordance

with

IN

-

STALLATION

,

ADJUSTMENTS

.

Ex

-

*

2

.

amine

latch

and

roller

surfaces

for

corrosion

.

Recondition

or

replace

The

pins

should

be

removed

and

all

old

oxidized

grease

removed

by

immersion

in

clean

petroleum

solvent

or

similar

cleaner

.

DO

NOT

USE

CARBON

-

TETRACHLORIDE

.

Wipe

the

bearing

clean

.

Apply

a

small

amount

of

G

.

E

.

Lubricant

D

50

H

15

to

the

entire

surface

of

the

bearing

and

just

before

reassembling

.

3

.

Damaged

trip

coil

.

REMEDY

:

Replace

damaged

coil

.

Blown

fuse

in

trip

circuit

.

REMEDY

:

Replace

blown

fuse

after

determining

cause

of

failure

.

Faulty

connections

in

trip

circuit

.

REMEDY

:

Repair

broken

or

loose

4

.

wires

and

see

that

all

binding

screws

are

tight

.

Damaged

or

dirty

contacts

in

trip

circuit

.

REMEDY

:

Recondition

or

replace

con

-

tacts

.

3

.

Breaker

kept

closed

or

open

for

too

long

a

period

.

REMEDY

:

Operate

breaker

more

often

to

wipe

contacts

clean

.

Replace

con

-

tacts

if

necessary

.

Overloading

.

REMEDY

:

Replace

breaker

with

one

of

adequate

rating

for

present

or

future

load

,

or

re

-

arrange

circuits

so

as

to

remove

excess

load

.

4

.

Removable

Seal

and

Open

Type

Ball

,

Roller

and

Needle

Bearings

The

bearings

should

be

first

removed

from

the

mechanism

and

disassembled

by

the

removal

of

the

seals

or

inner

race

in

the

case

of

needle

bearings

.

They

should

then

be

placed

in

a

container

of

clean

petroleum

solvent

or

similar

cleaner

.

DO

NOT

USE

CARBON

-

TETRACHLORIDE

.

If

the

grease

in

the

bearings

has

become

badly

oxidized

it

may

be

necessary

to

use

alcohol

(

type

used

for

thinning

shellac

)

to

remove

it

.

Ordinarily

,

by

agitating

the

bearings

in

the

cleaning

solution

,

and

using

a

stiff

brush

to

remove

the

solid

particles

,

the

bearings

can

be

satisfactorily

cleaned

.

Do

not

handle

the

bearings

with

bare

hands

as

deposits

from

the

skin

onto

the

bearings

are

inducive

to

corrosion

.

If

the

bearings

are

touched

,

the

contamination

can

be

re

-

moved

by

washing

in

alcohol

.

After

the

bearings

have

been

thoroughly

cleaned

,

spin

them

in

clean

new

light

machine

oil

until

the

cleaner

or

solvent

is

entirely

removed

.

Allow

this

oil

to

drain

off

and

then

repack

them

immediately

with

G

.

E

.

Lubricant

D

50

H

15

being

sure

all

metal

parts

are

greased

.

The

removable

seals

should

then

be

replaced

.

5

.

6

.

5

.

Primary

connections

of

inadequate

ca

-

pacity

.

REMEDY

:

Increase

size

or

number

of

conductors

or

remove

excess

current

.

FAILURE

TO

CLOSE

OR

LATCH

CLOSED

1

.

Mechanism

binding

or

sticking

caused

g

by

lack

of

lubrication

.

REMEDY

:

Lubricate

complete

mecha

-

nism

.

2

.

Mechanism

binding

or

sticking

caused

7

.

by

being

out

of

adjustment

.

REMEDY

:

Check

all

mechanism

ad

-

justments

,

latches

,

stops

,

auxiliary

devices

,

etc

.

,

in

accordance

with

IN

-

STALLATION

,

ADJUSTMENTS

.

Ex

-

amine

latch

and

roller

surfaces

for

corrosion

.

Control

device

sticking

or

not

oper

-

ating

properly

.

REMEDY

:

Check

and

adjust

control

device

,

or

replace

.

4

.

Damaged

or

dirty

contacts

in

control

circuit

,

including

control

device

.

REMEDY

:

Recondition

or

replace

con

-

tacts

.

Loose

connections

or

terminal

con

-

nections

.

REMEDY

:

Tighten

.

Ambient

temperature

too

high

.

REMEDY

:

Relocate

in

a

cooler

place

,

or

arrange

some

means

of

cooling

.

REPAIR

AND

REPLACEMENT

The

following

information

covers

in

detail

the

proper

method

of

removing

vari

-

ous

parts

of

the

breaker

in

order

to

make

*

any

necessary

repairs

.

This

section

in

-

cludes

only

those

repairs

that

can

be

made

at

the

installation

on

parts

of

the

breaker

that

are

most

subject

to

damage

or

wear

.

IMPORTANT

:

UPON

COMPLETION

OF

ANY

REPAIR

WORK

,

ALL

BREAKER

AND

MECHANISM

ADJUSTMENTS

MUST

BE

3

.

If

it

becomes

necessary

to

clean

the

bearings

in

alcohol

(

shellac

thinner

)

be

sure

the

alcohol

is

perfectly

:

lean

,

and

do

not

allow

the

bearings

to

remain

in

the

alcohol

more

than

a

few

NOTE

:

12

Courtesy of NationalSwitchgear.com

(

8

wO

*

u

.

t

3

.

13

3

1

.

Sear

Eushing

2

.

Supporting

Bolt

3

.

Upper

Mounting

Support

4

.

Stationary

Arcing

Contact

Assenbiy

5

.

Movable

Arcing

Contact

6

.

Assembly

Eolts

7

.

Brace

for

Arc

Chute

8

.

Arc

Chute

Mounting

Bracket

9

.

Lower

Supporting

Bolt

10

.

Lower

Mounting

Support

Fig

.

15

Arc

Chute

Partially

Removed

Shov

-

ing

Accessibility

of

Arcing

Contacts

14

to

/

.

7

1

u

_

15

ts

&

.

16

8

9

.

Asscshly

Balt

10

.

Upper

Counting

Support

11

.

Assembly

Bolt

and

Molded

Cap

12

.

Side

Shield

13

.

Asscssbly

Bolt

14

.

Lower

Mounting

Support

15

.

Assembly

Bolts

16

.

Assembly

Bolts

1

.

Assembly

Bolts

end

folded

Caps

2

.

Assembly

Bolts

3

.

Upper

Pole

Piece

4

.

Assembly

Bolt

5

.

Side

Brace

6

.

Lower

Pole

Piece

7

.

Assembly

Bolt

8

.

Lower

Brace

*

Refer

to

the

section

on

IN

-

CHECKED

.

STALLATION

,

paying

particular

attention

to

ADJUSTMENTS

and

FINAL

INSPECTION

.

ARC

CHUTE

Fig

.

16

Arc

Chute

Assembly

Complete

To

remove

an

arc

chute

,

first

open

the

breaker

and

remove

the

box

barrier

(

7

)

,

Fig

.

13

.

Loosen

the

two

upper

supporting

bolts

(

2

)

,

Fig

.

15

,

and

the

one

lower

sup

-

porting

bolt

(

9

)

using

a

3

/

4

"

wrench

.

By

raising

the

complete

arc

chute

assembly

about

3

/

8

"

and

sliding

it

toward

the

rear

of

the

breaker

it

can

be

removed

as

shown

in

Fig

.

15

.

To

disassemble

the

arc

chute

after

it

has

been

removed

from

the

breaker

,

pro

-

ceed

as

follows

:

1

.

Remove

the

assembly

bolts

(

7

,

9

,

11

and

13

)

,

Fig

.

16

.

2

.

Remove

the

side

brace

and

pole

piece

assembly

(

5

)

,

Fig

.

16

.

3

.

To

remove

the

upper

mounting

support

(

10

)

,

Fie

.

16

,

remove

the

assembly

bolts

(

1

)

and

connection

screw

(

2

)

,

Fig

.

18

.

4

.

Remove

the

assembly

bolts

(

16

)

,

Fie

.

16

to

remove

the

lower

brace

(

8

;

.

5

.

Remove

the

lower

mounting

support

(

14

)

,

Fig

.

16

,

by

removing

the

assembly

bolts

(

15

)

and

the

connection

nut

(

9

)

,

Fig

.

18

.

6

.

At

this

point

the

fiber

side

shields

(

6

)

,

Fig

.

18

,

the

upper

arc

runner

assembly

(

4

)

and

lower

arc

runner

assembly

(

7

)

can

be

removed

.

7

.

Further

disassembly

of

both

the

upper

and

lower

arc

runner

assemblies

can

be

done

by

removing

the

various

screws

and

1

/

4

"

assembly

bolts

(

not

illustrated

)

as

shown

in

Fig

.

17

.

8

.

The

arc

chute

sides

(

6

)

,

Fig

.

17

,

can

be

separated

by

removal

of

assembly

bolts

(

2

and

4

)

,

Fig

.

16

.

Reassemble

the

arc

chute

in

the

reverse

order

.

The

following

items

should

be

noted

during

reassembly

:

1

.

Equally

space

the

fins

of

the

arc

chute

sides

before

bolting

together

.

2

.

Check

to

insure

that

electrical

connec

-

tions

to

the

blowout

coils

are

tight

.

3

.

When

reassembling

the

arc

runner

as

-

semblies

,

check

that

the

spacers

(

1

and

13

)

,

Fig

.

17

,

are

correctly

installed

.

4

.

Before

bolting

the

upper

mounting

sup

-

port

in

place

,

make

certain

that

the

upper

arc

runner

assembly

is

tight

against

the

arc

chute

side

so

that

the

gap

between

the

upper

insulation

(

7

)

,

Fig

.

17

,

and

the

arc

chute

side

(

6

)

is

a

minimum

.

5

.

Make

certain

that

the

electrical

con

-

nections

(

2

and

9

)

,

Fig

.

18

,

are

tight

.

To

reassemble

the

arc

chute

to

the

breaker

,

proceed

as

follows

:

1

.

Rest

the

lower

mounting

support

(

10

)

on

the

arc

chute

mounting

bracket

(

8

)

as

shown

in

Fig

.

15

.

2

.

Slide

the

arc

chute

forward

and

lift

it

slightly

to

engage

the

supporting

bolts

(

2

)

,

Fig

.

15

,

in

the

slots

of

the

upper

mounting

support

(

3

)

.

3

.

Tighten

the

supporting

bolts

(

2

and

9

)

,

Fig

.

15

.

the

electrical

and

mechanical

connec

-

tions

between

the

bushing

and

the

arc

runners

.

4

.

Check

that

the

movable

arcing

contact

(

5

)

,

Fig

.

3

,

passes

through

the

slot

in

the

upper

arc

runner

(

6

)

without

touch

-

These

bolts

serve

as

both

ing

.

13

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

8

r

*

.

8

o

ac

I

"

*

CJ

u

.

to

cs

r

-

8

§

00

1

.

Upper

Arc

Runner

Spacers

2

.

Upper

Arc

Runner

Assembly

3

.

Blowout

Core

4

.

Blo

’

cout

Coil

5

.

Insulation

6

.

Upper

Arc

Runner

7

.

Arc

Chute

Side

8

.

Upper

Insulation

9

.

Lower

Arc

Runner

10

.

Blowout

Coil

11

.

Blowout

Core

12

.

Lower

Arc

Runner

Assembly

13

.

Lower

Coil

Connection

14

.

Lower

Arc

Runner

Spacers

CP

.

U

-

1

.

Upper

Mounting

Support

2

.

Connection

Bolt

3

.

Upper

Elo

-

sout

Coil

4

.

Upper

Arc

Runner

Assembly

5

.

Upper

Arc

Runner

6

.

Side

Shield

7

.

Lower

Arc

Runner

Assembly

8

.

Lower

Coil

Connection

9

.

Connection

Nut

10

.

Lover

Mounting

Support

•

Fig

.

17

Arc

Chute

Asseably

with

Side

Removed

Fig

.

18

Front

View

Arc

Chute

Asseably

2

.

Remove

the

cup

bearing

(

3

)

and

the

(

2

)

Fig

.

4

.

3

.

When

reassembling

,

first

insert

the

piston

assembly

(

10

)

,

Fig

.

21

,

into

the

booster

cylinder

and

reassemble

the

cup

bearing

(

3

)

.

4

.

Replace

(

2

)

,

Fig

.

nection

bar

(

9

)

,

Fig

.

21

.

F

.

After

disassembly

and

reassembly

of

any

contacts

,

check

all

contact

adjust

-

ments

as

described

under

INSTALLA

-

TION

,

ADJUSTMENTS

.

spring

compression

(

Fig

.

20

A

)

.

Turn

handle

(

2

)

in

clockwise

direc

-

tion

to

compress

contact

spring

(

Fig

.

20

B

)

.

Hold

spring

firmly

in

yoke

on

spring

compressor

to

pre

-

vent

the

spring

from

slipping

out

of

the

compressor

.

Place

washer

(

not

shown

)

on

guide

on

top

of

spring

,

place

top

of

guide

into

hole

in

spring

retainer

(

4

)

and

the

round

end

of

spring

out

in

primary

finger

Hold

spring

assembly

firmly

in

place

and

remove

spring

compressor

.

CONTACTS

3

.

Open

the

breaker

and

remove

the

box

barrier

and

arc

chutes

as

previously

des

-

cribed

.

To

remove

the

contacts

,

proceed

as

follows

:

A

.

Stationary

Arcing

Contacts

(

10

)

Fig

.

19

1

.

Disconnect

the

contact

braids

from

contact

fingers

by

removing

two

bolts

(

8

)

,

Fig

.

19

.

2

.

Grasp

the

lower

end

of

the

contact

fingers

with

pliers

and

pull

contact

assembly

downward

to

remove

from

stud

assembly

.

3

.

To

disassemble

braids

from

stud

assembly

,

remove

one

bolt

(

5

)

.

4

.

To

disassemble

stud

assembly

from

contact

support

,

remove

two

bolts

5

.

Reassemble

in

the

reverse

order

.

B

.

Stationary

Primary

Contacts

(

9

)

,

Fig

.

20

1

.

Compress

the

contact

spring

(

6

)

.

2

.

Remove

spring

and

spring

guide

(

1

)

.

3

.

Raise

the

contact

finger

to

clear

the

primary

contact

stop

plate

(

8

)

and

lift

the

finger

out

of

contact

support

(

7

)

.

finger

at

a

time

.

To

replace

the

Stationary

Primary

Con

-

tacts

:

1

.

Place

the

finger

(

9

)

on

contact

sup

-

port

(

7

)

so

that

it

is

retained

by

stop

plate

(

8

)

.

2

.

Open

spring

compressor

(

3

)

and

as

-

semble

spring

guide

,

spring

and

4

,

and

con

-

4

.

guide

in

cut

(

Fig

.

20

C

)

.

5

.

BUSHINGS

C

.

Movable

Arcing

Contact

(

7

)

,

Fig

.

21

.

1

.

Remove

the

assembly

bolts

(

8

)

.

2

.

Reassemble

in

reverse

order

.

IMPORTANT

:

DO

NOT

REMOVE

ALL

SEX

BUSHINGS

AT

ONCE

.

The

bushings

have

been

carefully

aligned

with

the

breaker

frame

,

during

assembly

at

the

factory

,

and

it

is

important

that

this

alignment

be

maintain

-

ed

to

facilitate

installation

of

the

breaker

in

the

metal

-

clad

unit

.

It

is

therefore

recom

-

mended

that

the

bushings

be

removed

and

reassembled

one

at

a

time

.

Also

,

before

removing

any

one

bushing

,

measure

the

distance

from

that

particular

bushing

to

ad

-

jacent

bushings

in

both

directions

,

so

that

it

may

be

re

-

installed

in

the

same

location

.

It

is

also

possible

to

remove

and

re

-

assemble

three

bushings

at

one

time

.

If

this

is

preferred

,

alignment

of

the

bushings

may

be

accomplished

by

placing

the

breaker

in

a

de

-

energized

spare

metal

-

clad

unit

before

tightening

the

bushing

mounting

bolts

.

This

must

be

done

before

the

arc

chutes

are

re

-

installed

(

6

)

.

D

.

Movable

Primary

Contacts

(

5

)

,

Fig

.

21

.

(

1200

Amp

.

Breaker

)

1

.

Remove

the

nuts

from

assembly

bolts

(

6

)

.

2

.

Remove

the

primary

contacts

and

spacers

(

not

illustrated

)

.

3

.

Reassemble

in

reverse

order

.

(

2000

Amp

.

Breaker

)

1

.

Remove

the

nuts

from

assembly

bolts

(

6

)

.

2

.

Remove

the

connection

bar

(

9

)

.

3

.

Remove

the

cup

bearing

(

3

)

.

4

.

Spread

the

contact

arms

(

4

)

and

remove

the

primary

contacts

(

5

)

.

5

.

Reassemble

in

the

reverse

order

.

Remove

one

contact

E

.

Contact

Blade

Assembly

(

4

,

5

,

7

)

,

Fig

.

21

1

.

Remove

the

connection

bar

(

9

)

.

14

Courtesy of NationalSwitchgear.com

*

To

replace

the

bushing

,

proceed

as

follows

:

V

.

Rear

Bushing

Open

the

breaker

and

remove

the

box

barrier

and

arc

chutes

as

already

described

.

Remove

the

upper

and

lower

horizontal

barriers

(

4

and

5

)

,

Fig

.

22

.

Remove

the

four

bolts

(

3

)

at

the

mount

-

ing

flange

of

the

rear

bushing

being

removed

and

lower

the

bushing

assem

-

bly

.

Referring

to

Fig

.

20

,

disassemble

the

primary

contact

springs

(

6

)

as

pre

-

viously

described

.

Disassemble

the

spring

retainer

(

4

)

by

removing

mounting

bolts

(

5

)

.

Referring

to

Fig

.

19

,

disassemble

the

contact

support

(

4

)

and

arc

chute

mount

-

ing

bracket

(

2

)

by

removing

two

bolts

(

3

)

.

Reassemble

in

the

reverse

order

.

The

arc

chute

mounting

bracket

(

2

)

is

not

symmetrical

and

must

be

assembled

correctly

to

orient

the

arc

chute

properly

on

the

breaker

.

The

longest

projection

of

the

bracket

should

be

toward

the

lower

end

of

the

bushing

.

1

.

?

o

CM

2

.

CM

o

CO

3

.

S

4

.

5

.

6

.

7

.

10

an

=

J

-

s

1

.

Fear

Ashing

2

.

Guide

and

Support

for

Arc

Chute

3

.

Bolts

for

Contact

Support

4

.

Contact

Support

5

.

Bolt

for

Flexible

Braid

6

.

Mounting

Bolt

7

.

Flexible

Braid

8

.

Connection

Bolt

9

.

Stud

for

Mounting

Arcing

Fingers

10

.

Stationary

Arcing

Contact

Assembly

11

.

Spring

Baffle

1

.

Contact

Springs

2

.

Stationary

Primary

Contacts

3

.

Qjp

Bearing

4

.

Contact

Arm

5

.

Movable

Primary

Contacts

6

.

Assembly

Bolts

7

.

Movable

Arcing

Contact

8

.

Assembly

Bolts

9

.

Connection

Bar

10

.

Piston

Assembly

Front

Bushing

8

1

.

Open

the

breaker

and

remove

the

box

barrier

and

arc

chutes

as

already

des

-

cribed

.

Remove

the

upper

and

lowrer

horizontal

barriers

(

4

and

5

)

,

Fig

.

22

.

Remove

the

connection

bar

(

9

)

,

Fig

.

21

,

and

cup

bearing

(

3

)

.

Remove

the

four

bolts

at

the

mounting

flange

of

the

front

bushing

being

re

-

moved

,

and

lower

the

bushing

.

O

'

u

.

2

.

3

.

4

.

c

Fig

.

19

Rear

Bushing

Assembly

Fig

.

21

Removal

of

Contacts

5

.

When

reassembling

,

first

mount

the

bushing

and

assemble

the

cup

bearing

(

3

)

and

contact

arm

(

4

)

,

Fig

.

21

.

Check

all

contact

adjustments

as

out

-

lined

unaer

INSTALLATION

,

ADJUST

-

MENTS

.

if

6

.

CO

—

I

co

/

:

CM

§

CM

CTI

u

_

=

f

o

9

CM

s

CM

1

.

Front

Bushing

2

.

Bear

Bushing

3

.

Mounting

Bolts

4

.

Upper

Horizontal

Barrier

5

.

Lower

Horizontal

Barrier

*

1

.

Spring

Guide

2

.

Handle

for

Spring

Compressor

3

.

Spring

Compressor

4

.

Spring

Retainer

5

.

Assembly

Bolt

for

Spring

Retainer

6

.

Spring

7

.

Contact

Support

8

.

Stop

Plate

9

.

Stationery

Primary

Contact

Fingers

u

.

Rear

View

of

Breaker

with

One

Arc

Chute

Removed

Fig

.

22

Fig

.

20

Method

of

Installing

Primary

Contact

Springs

Using

a

Spring

Compressor

15

*

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

CLOSING

COIL

The

closing

coil

is

contained

within

the

solenoid

pot

(

1

)

,

Fig

.

23

.

To

remove

the

closing

coil

,

proceed

as

follows

:

1

.

Open

the

breaker

.

2

.

Remove

the

two

closing

coil

leads

(

10

)

.

Remove

the

terminal

board

(

2

)

from

the

solenoid

pot

and

let

it

hang

by

the

wires

.

Also

,

remove

the

wire

cleat

band

(

3

)

.

o

Remove

the

stop

nuts

(

7

and

12

)

on

guide

studs

(

11

)

,

lower

the

armature

plate

(

6

)

and

control

device

trip

plunger

(

5

)

.

Note

:

For

ease

in

removing

the

closing

coil

and

bottom

plate

(

step

5

)

the

armature

and

plunger

assembly

can

be

removed

from

the

mechanism

by

removing

the

four

bolts

on

the

under

side

of

the

armature

plate

.

Loosen

the

four

nuts

under

the

bottom

plate

(

4

)

approximately

1

/

2

"

.

Support

the

bottom

plate

with

a

rope

sling

or

hoist

and

remove

the

two

rear

nuts

.

3

.

4

.

LO

=

r

o

CN

o

CO

Remove

the

nuts

(

8

)

at

the

top

of

the

front

studs

.

This

permits

the

bottom

plate

,

closing

coil

,

solenoid

pot

(

1

)

and

control

device

plunger

guide

(

9

)

to

be

removed

.

5

.

CO

C

«

J

cn

u

_

To

reassemble

,

first

place

the

closing

coil

and

spacers

on

the

bottom

plate

(

4

)

.

Raise

into

position

,

inserting

the

control

device

plunger

guide

(

9

)

and

compressing

the

piston

ring

on

the

upper

pole

piece

.

Tilt

the

bottom

plate

downward

and

replace

the

solenoid

pot

(

1

)

and

two

front

studs

and

nuts

(

8

)

.

6

.

7

.

1

.

Solenoid

Pot

v

.

2

.

Terminal

Board

3

.

Secondary

Wire

Cleats

4

.

Bottom

Plate

5

.

Control

Device

Trip

Plunger

Rod

6

.

Guide

Studs

7

.

Closing

Armature

8

.

Stop

Nuts

9

.

Front

Stud

Nuts

10

.

Plunger

Guide

11

.

Closing

Coil

Leads

12

.

Stop

Nuts

Tighten

the

four

nuts

under

the

bottom

plate

taking

special

precaution

to

center

the

closing

coil

around

the

pole

piece

.

If

the

closing

coil

is

not

firmly

held

in

place

,

add

spacers

above

the

closing

coil

.

8

.

ao

CN

P

"

o

Fig

.

23

Closing

Solenoid

Assenbly

CN

8

=

-

Replace

the

control

device

trip

plunger

(

5

)

and

armature

(

6

)

.

9

.

CN

cn

Li

-

10

.

Recheck

the

mechanism

adjustments

as

explained

under

INSTALLATION

,

ADJUSTMENTS

.

TRIP

COIL

To

replace

the

potential

ti

‘

.

p

coil

(

3

)

,

Fig

.

25

,

proceed

as

follows

:

Open

the

breaker

and

remove

the

opening

spring

unit

(

2

)

,

Fig

.

24

,

by

removing

the

pivot

pins

(

1

and

3

)

.

Disconnect

the

two

trip

coil

lead

wires

(

4

)

,

Fig

.

25

.

Remove

the

two

mounting

bolts

(

2

)

and

the

trip

coil

support

(

1

)

.

Remove

the

trip

coil

(

3

)

.

After

reassembling

(

in

the

reverse

order

)

check

the

primary

contact

gap

adjustment

as

explained

under

INSTAL

-

LATION

,

ADJUSTMENTS

.

1

.

2

.

3

.

4

.

1

.

Pivot

2

.

Opening

Spring

Unit

3

.

Pivot

5

.

Fig

.

24

Opening

Spring

Assembly

16

Courtesy of NationalSwitchgear.com

INTERLOCK

SWITCH

To

remove

the

interlock

switch

(

3

)

Fig

.

6

,

remove

the

two

mounting

screws

(

4

)

and

disconnect

the

lead

wires

.

Re

-

assemble

in

the

reverse

order

and

check

the

switch

adjustments

as

explained

under

-

INSTALLATION

,

ADJUSTMENTS

.

LATCH

CHECKING

SWITCH

To

remove

the

latch

checking

switch

(

6

)

,

Fig

.

6

,

(

when

furnished

)

,

remove

the

two

mounting

screws

(

8

)

and

disconnect

the

lead

wires

.

Reassemble

in

the

reverse

order

and

check

the

switch

adjustments

as

explained

under

INSTALLATION

,

ADJUST

-

MENTS

.

cs

(

0

2

o

CO

in

Oi

cn

u

_

CUT

-

OFF

SWITCH

To

remove

the

cut

-

off

switch

(

1

)

,

Fig

.

8

,

remove

the

two

mounting

bolts

and

disconnect

the

lead

wires

,

sembling

,

check

the

cut

-

off

switch

adjust

-

ment

as

explained

under

INSTALLATION

,

ADJUSTMENTS

.

When

reas

-

3

.

Trip

Coil

2

.

Mounting

Bolt

*

s

4

.

Trip

Coil

Leads

Fig

.

25

Potential

Trip

Coil

:

17

t

Courtesy of NationalSwitchgear.com

*

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

RENEWAL

PARTS

The

listed

terms

"

right

”

and

"

left

"

apply

when

facing

the

solenoid

mechanism

end

of

the

breaker

.

Note

:

ORDERING

INSTRUCTIONS

1

.

ALWAYS

SPECIFY

THE

COMPLETE

NAMEPLATE

DATA

OF

BOTH

THE

BREAKER

AND

THE

MECHANISM

.

2

.

SPECIFY

THE

QUANTITY

,

CATALOG

NUMBER

(

IF

LISTED

)

,

REFERENCE

NUMBER

(

IF

LISTED

)

,

AND

DESCRIPTION

OF

EACH

PART

ORDERED

,

AND

THIS

BULLETIN

NUMBER

.

3

.

STANDARD

HARDWARE

,

SUCH

AS

SCREWS

,

BOLTS

,

NUTS

,

WASHERS

,

ETC

.

,

IS

NOT

LISTED

IN

THIS

BULLETIN

.

SUCH

ITEMS

SHOULD

BE

PURCHASED

LOCALLY

.

4

.

FOR

PRICES

,

REFER

TO

THE

NEAREST

OFFICE

OF

THE

GENERAL

ELECTRIC

COMPANY

.

ILLUSTRATION

REFERENCE

Page

Arc

Chute

Control

Device

for

All

Mechanisms

Cross

-

sections

-

Type

AM

2.4

/

4.16

-

3

Impact

Trip

Device

for

All

Mechanisms

Interlock

Plunger

Maintenance

Closing

Device

Movable

Contact

Arm

Assembly

MS

-

13

Mechanism

-

Cross

-

section

,

Details

,

Spring

Asm

.

MS

-

13

Mechanism

,

Front

View

,

Right

and

Left

Side

View

MS

-

13

Mechanism

,

with

Current

Trip

,

Partial

View

Rear

Bushing

Assembly

Secondary

Disconnect

Device

and

Mechanism

Parts

Undervoltage

Device

FIG

.

27

FIG

.

38

FIG

.

26

FIG

.

37

FIG

.

30

FIG

.

34

FIG

.

29

FIG

.

31

FIG

.

32

FIG

.

35

FIG

.

28

FIG

.

33

FIG

.

36

22

32

20

31

25

0

)

29

24

27

28

30

23

29

30

18

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

PARTS

RECOMMENDED

FOR

NORMAL

MAINTENANCE

\

In

the

tabulation

below

are

listed

the

parts

of

those

breakers

which

are

usually

recommended

for

stock

for

normal

maintenance

.

Other

parts

are

listed

on

the

following

pages

.

«

CAT

.

NO

.

FOR

TYPE

AM

-

4.16

-

(

MVA

)

-

3

NO

.

PER

BREAKER

FIG

.

REF

.

RATING

IN

AMPS

RATING

IN

MV

A

NO

.

NO

.

DESCRIPTION

J

26

1

263

B

293

P

-

2

258

C

616

P

-

9

236

C

791

P

-

8

236

C

791

P

-

8

6496488

P

-

3

236

C

790

G

-

9

6591644

P

-

7

6591644

P

-

8

6591644

P

-

7

6591644

P

-

8

6591644

P

-

7

6591644

P

-

8

414

A

180

6509787

P

-

1

6445087

6557243

P

-

1

6557243

P

-

2

6557243

P

-

2

258

C

616

P

-

13

258

C

616

P

-

6

414

A

116

P

-

4

421711

407193

383

A

932

P

-

1

414

A

116

P

-

2

414

A

117

P

-

1

281

B

708

G

-

4

236

C

791

G

-

4

6375521

G

-

2

6375521

G

-

6

6375521

G

-

l

6375521

G

-

2

6174582

G

-

l

6174582

G

-

2

6174582

G

-

14

6174582

G

-

10

6275070

G

-

l

6275070

G

-

2

6275070

G

-

3

6275017

G

-

19

6275017

G

-

20

6275017

G

-

33

6174599

G

-

2

6174599

G

-

6

6275017

G

-

19

6275017

G

-

20

6275017

G

-

33

All All

3

Booster

cylinder

Upper

runner

insulation

Primary

contact

finger

Primary

contact

finger

Movable

arcing

contact

Stationary

arcing

contact

asm

.

Primary

contact

mov

.

Primary

contact

mov

.

Primary

contact

mov

.

Primary

contact

mov

.

Primary

contact

mov

.

Primary

contact

mov

.

Primary

contact

finger

spring

Primary

contact

finger

spring

Buffer

Clamp

for

buffer

Clamp

for

buffer

Clamp

for

buffer

Lower

barrier

Lower

barrier

Insulating

plate

Insulating

cap

Washer

Lower

shield

Insulation

Upper

insulation

Operating

rod

Flex

.

Conn

.

Closing

coil

(

125

V

.

d

-

c

Closing

coil

(

125

V

.

d

-

c

Closing

coil

(

250

V

.

d

-

c

Closing

coil

(

250

V

.

d

-

c

.

Potential

trip

coil

(

125

V

.

d

-

c

Potential

trip

coil

(

250

V

.

d

-

c

Potential

trip

coil

(

230

V

.

a

-

c

Potential

trip

coil

(

48

V

.

d

-

c

)

Potential

trip

coil

(

24

V

.

d

-

c

)

Potential

trip

coil

(

48

V

.

d

-

c

)

Potential

trip

coil

(

32

V

.

d

-

c

)

UVD

Coil

(

125

V

.

d

-

c

)

UVD

Coil

(

250

V

.

d

-

c

)

UVD

Coil

(

230

V

.

a

-

c

)

Current

trip

coil

(

3

Amp

.

Capacitor

trip

coil

(

230

V

.

a

-

c

Control

device

coil

(

125

V

.

d

-

c

'

Control

device

coil

(

250

V

.

d

-

c

(

Control

device

coil

(

230

V

.

a

-

c

,

cont

.

)

Control

device

coil

(

230

V

.

a

-

c

)

int

.

)

27

130

All

6

600

/

1200

/

2000

28

165

150

12

28

165

250

24

29

211

All

3

156

28

All

3

100

/

150

100

/

150

/

250

150

/

250

600

/

1200

600

/

1200

29

212

3

29

212

3

29

212

6

1200

29

212

6

1200

29

212

All

2000

6

29

212

All

2000

6

600

/

1200

/

2000

28

160

150

12

28

160

250

24

28

159

All

3

600

/

1200

28

168

150

6

168

28

150

2000

6

1200

/

2000

28

168

250

6

27

132

150

All

6

27

132

250

All

6

28

158

All

3

27

131

All Ail

12

27

A

250

j

All

12

27

126

250

All

6

27

117

All

3

27

118

All

6

All

?

26

7

All

3

AH

28

155

All

3

261

f

30

250

All

1

30

261

150

All

1

30

261

250

All

1

30

261

150

All

1

32

370

All

1

32

370

All

1

32

370

All

AH

1

32

370

All

1

32

370

All

1

All

370

32

All

1

All

370

32

All

1

All

663

36

All

1

36

663

All

1

36

663

All

1

37

738

All

3

All

a

-

c

37

738

All

1

All

38

753

All

1

AU

38

753

All All

1

38

753

All

1

38

753

All

6275017

G

-

34

All

1

*

Not

shown

.

19

.

*

Courtesy of NationalSwitchgear.com

*

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

e

H

9

8

15

S

l

8

STij

!

CN

I

\

ID

CM

8

Cn

U

_

>

*

o

13

-

’

MR

as

*

i

A

I

+

QT

.

'

\

*

\

iw

2

—

0

100

I

^

I

l

210

\

V

ylyL

-

\

•

ra

-

.

i

»

11

CO

t

7

i

CM

I

/

7

Li

<

£

>

CM

'

I

\

c

i

—

z

r

/

!

on

•

*

>

i

k

-

'

!

-

•

:

U

.

CTj

5

n

1 5

6

1 2

3

4

19

32

J

22

23

*

/

24

*

-

ND

27

R

,

CM

cr

.

r

-

25

27

c

_

>

CO

CM

SECTIONS

"

AA

"

*

7

<

o

31

28

cs

TOPff

OTP

TO

on

26

30

U

-

(

2000

AMP

)

(

1200

AMP

)

Fig

.

26

Cross

-

sections

Type

AH

2.4

/

4.16

-

3

20

Courtesy of NationalSwitchgear.com

GE AM-2.4/4.16-100/150- 3 User manual

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