Ge Gek-7345 User manual

INSTRUCTIONS

AND

RECOMMENDED

PARTS

FOR

MAINTENANCE

GEK

-

7345

A

Supersedes

GEK

-

7345

{

!

MAGNE

-

BLAST

CIRCUIT

BREAKER

I

J

TYPE

AM

-

13.8

-

750

-

5

1200

&

2000

AMPERE

W

/

ML

-

13

MECHANISM

I

:

INTRODUCTION

.

•

3

•

•••

•

I

RECEIVING

,

HANDLING

AND

STORAGE

.

1

!

#

•

«

3

•

• •

•

INSTALLATION

.

.••

•

A

••

•

DESCRIPTION

OF

OPERATION

.

*

4

•

• • •

•

1

ADJUSTMENTS

10

I

!

GENERAL

MAINTENANCE

15

it

SI

W

28

RENEWAL

PARTS

I

1

s

II

I

SWITCHGEAR

PRODUCTS

DEPARTMENT

ELECTRIC

GENERAL

I

PHILADELPHIA

,

PA

.

ZJZIZ

:

.

Courtesy of NationalSwitchgear.com

Trnr

-

Tr

—

-

1

“

I

;

I

!

:

'

i

Courtesy of NationalSwitchgear.com

MAGNE

-

BLAST

CIRCUIT

BREAKER

AM

-

13.8

-

750

-

5

Letter

designation

B

,

C

,

F

,

H

,

J

,

L

,

N

,

&

P

used

immediately

following

the

model

number

indicates

basic

design

features

.

INTRODUCTION

The

Magne

-

blast

Breaker

is

the

removable

and

interchangeable

interrupting

element

used

in

metal

-

clad

switchgear

to

provide

reliable

control

and

protection

of

electrical

apparatus

and

power

systems

.

be

such

that

its

voltage

,

current

,

and

interrupting

ratings

are

never

exceeded

,

is

written

to

include

all

ratings

of

the

breaker

as

well

as

several

design

variations

,

the

in

-

structions

will

be

of

a

general

character

and

all

illustrations

will

be

typical

unless

otherwise

specified

*

PROPER

INSTALLATION

AND

MAINTENANCE

ARE

NECESSARY

TO

INSURE

CONTINUED

SAT

-

ISFACTORY

OPERATION

OF

THE

BREAKER

*

The

following

instructions

will

provide

complete

information

for

placing

magne

-

blast

breakers

in

service

and

for

maintaining

satisfactory

operation

.

Since

this

book

The

AM

-

13.8

-

750

Magne

-

blast

Breaker

is

available

with

continuous

current

ratings

of

1200

amperes

and

2000

amperes

in

accordance

with

applicable

industry

standards

.

Refer

to

the

breaker

nameplate

for

complete

rating

information

of

any

particular

breaker

.

The

nameplate

also

de

-

scribes

the

control

power

requirements

for

that

breaker

.

The

application

of

a

breaker

must

RECEIVING

,

HANDLING

AND

STORAGE

Receiving

and

Handling

against

condensation

,

preferably

by

stor

-

ing

it

in

a

warm

dry

room

,

since

water

absorption

has

an

adverse

effect

on

the

insulation

parts

.

Circuit

breakers

for

out

-

door

metal

-

clad

switchgear

should

be

stored

in

the

equipment

only

when

power

is

available

and

the

heaters

are

in

oper

-

ation

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

combination

has

a

very

corrosive

effect

on

many

parts

.

3

.

Unfinished

surfaces

of

rollers

,

latches

,

etc

.

,

of

the

operating

mechanism

should

be

coated

with

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

mechan

-

ical

condition

.

Should

the

breaker

be

stored

under

unfavorable

atmospheric

conditions

,

it

should

be

cleaned

and

dried

out

before

being

placed

in

service

*

Each

breaker

is

carefully

inspected

and

packed

for

shipment

.

Immediately

upon

receipt

of

the

circuit

breaker

,

an

examination

should

be

made

for

any

damage

sustained

in

transit

.

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

.

It

is

expected

that

due

care

will

be

exercised

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

.

Check

all

parts

against

the

packing

list

to

be

sure

that

no

parts

have

been

overlooked

.

Storage

It

is

recommended

that

the

breaker

be

put

into

service

immediately

in

its

permanent

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

protected

Cover

Photo

(

8034807

)

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

,

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

.

To

the

extent

required

the

products

described

herein

meet

applicable

ANSI

,

IEEE

and

NEMA

standards

;

but

no

such

assurance

is

given

with

respect

to

local

codes

and

ordinances

because

they

vary

greatly

.

Should

3

A

.

:

..

:

V

j

.

..

i

IVv

.

V

.

V

.

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

i

INSTALLATION

ER

OR

MECHANISM

UNLESS

THE

CLOS

-

ING

SPRINGS

ARE

BLOCKED

AND

THE

OPENING

SPRINGS

HAVE

BEEN

TRIP

-

PED

OPEN

OR

MECHANICALLY

BLOCK

-

ED

.

THIS

PRECAUTION

IS

REQUIRED

TO

PREVENT

ACCIDENTAL

CLOSING

OR

TRIPPING

.

1

.

Remove

the

box

barrier

and

mechanism

cover

and

make

a

visual

inspection

to

ascertain

that

the

breaker

and

mechanism

is

in

satisfactory

condition

.

Check

all

bearing

surfaces

of

the

mechanism

for

lubrication

.

Refer

to

section

on

lubrication

page

18

and

Figure

17

.

2

.

Charge

the

breaker

closing

springs

man

-

ually

using

a

5

/

8

"

ratchet

wrench

to

turn

the

driving

eccentric

(

4

)

Figure

1

.

Turning

the

eccentric

counter

clockwise

will

ad

-

vance

the

ratchet

wheel

and

compress

the

springs

.

When

the

springs

have

reached

the

fully

charged

position

the

indicator

(

1

)

will

read

"

CHARGED

"

,

and

the

driving

pawl

will

be

raised

from

the

ratchet

wheel

teeth

.

Additional

turning

of

the

eccentric

will

not

advance

the

ratchet

wheel

.

Insert

the

spring

blocking

device

(

6

)

and

manually

discharge

the

springs

against

the

pins

by

pushing

the

manual

close

.

button

(

3

)

.

The

springs

are

now

blocked

and

slow

closing

of

the

breaker

contacts

can

be

accomplished

by

again

turning

the

driving

eccentric

with

a

5

/

8

"

ratchet

wrench

.

During

the

slow

closing

operation

check

to

insure

that

the

mechanism

does

not

stick

or

bind

during

the

entire

stroke

,

that

it

latches

securely

in

the

closed

position

,

and

that

it

trips

freely

when

the

manual

trip

lever

is

operated

.

At

this

time

,

also

check

the

following

adjustments

:

a

.

Arcing

contact

wipe

(

Refer

to

page

10

)

b

.

Primary

contact

wipe

(

Refer

to

pagelO

)

c

.

Primary

contact

gap

(

Refer

to

page

11

)

.

;

v

~

The

closing

springs

should

now

be

un

-

blocked

.

Rotate

the

driving

eccentric

until

the

indicator

reads

"

CHARGED

"

and

the

ratchet

wheel

does

not

advance

.

The

spring

blocking

device

can

now

be

removed

.

Connect

the

test

coupler

to

the

circuit

breaker

and

operate

it

electrically

sev

-

eral

times

.

Check

the

control

voltage

as

described

under

"

CONTROL

POWER

CHECK

"

(

Page

14

)

.

Disconnect

the

test

coupler

and

replace

box

barrier

.

If

the

breaker

has

been

stored

for

a

long

period

of

time

,

it

is

recommended

that

the

insulation

be

checked

with

a

standard

60

hertz

high

potential

test

.

Refer

to

Insulation

Test

(

Page

17

)

.

I

3

.

4

.

5

.

NOTE

:

If

the

breaker

secondary

wiring

is

to

be

given

a

hi

-

potential

test

at

1500

volts

,

remove

both

the

motor

leads

from

the

terminal

connection

.

Failure

to

dis

-

connect

the

motor

from

the

circuit

may

cause

damage

to

the

winding

insulation

.

Lubricate

the

silver

portion

of

the

ball

contact

at

the

top

of

the

breaker

bushing

by

applying

,

a

thin

film

of

contact

lu

-

bricant

D

50

H

47

Refer

to

metal

-

clad

instruction

book

GEH

-

1802

for

instruction

on

inserting

the

breaker

into

the

metal

-

clad

unit

.

6

.

7

.

DO

NOT

WORK

ON

EITHER

THE

BREAK

-

DESCRIPTION

OF

OPERATION

stored

energy

type

designed

to

give

high

speed

closing

and

opening

.

The

mechanism

will

operate

on

a

-

c

or

d

-

c

voltage

as

indicated

on

the

breaker

nameplate

.

Closing

and

opening

operations

are

controlled

either

electrically

from

the

metal

-

clad

unit

and

remote

location

,

or

mechanically

by

the

manual

close

and

trip

levers

on

the

breaker

.

All

secondary

connections

from

the

breaker

to

the

metal

clad

unit

are

made

through

the

coupler

(

1

)

Figure

2

.

A

spring

release

interlock

,

Figure

3

,

is

provided

to

discharge

both

the

closing

and

opening

springs

when

the

breaker

is

withdrawn

from

or

inserted

into

the

metal

-

clad

unit

.

The

Magne

-

blast

Breaker

has

two

principal

components

;

the

breaker

element

and

the

operating

mechanism

:

The

breaker

element

is

three

similar

pole

units

,

each

of

which

includes

the

current

carrying

parts

,

main

and

arcing

contacts

,

interrupter

,

and

an

enclosing

barrier

system

that

provides

insulation

between

poles

,

or

phases

and

to

ground

.

The

primary

connections

to

the

associated

metal

-

clad

switchgear

are

made

through

the

ball

contacts

at

the

top

of

the

breaker

bushings

.

The

operating

mechanism

type

ML

-

13

is

of

the

I

4

§

:

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

Figure

1

.

(

8040935

)

Spring

Blocking

Device

1

.

Charge

-

Discharge

Indicator

Driving

Pawl

Manual

Close

Button

Eccentric

Manual

Charging

Wrench

Spring

Blocking

Device

Figure

2

.

(

8040932

)

Left

Side

View

ML

-

13

Operating

Mechanism

2

3

i

.

Secondary

Coupler

Interlock

Switches

Auxiliary

Switch

Latch

Checking

Switch

Cam

Closing

Roller

Power

Switches

Closing

Latch

Closing

Springs

Motor

2

.

4

3

.

4

.

5

.

6

.

7

.

8

.

9

.

10

.

Figure

3

.

(

8038805

)

Spring

Discharge

Linkage

1

.

Link

Adjusting

Bolt

Trip

Latch

Crank

Discharge

Crank

Adjusting

Clevis

Spring

Release

Crank

2

.

3

.

4

.

5

.

6

.

5

V

'

TWiTV

'

"

'

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

Blast

Circuit

Breaker

A

positive

interlock

(

3

)

Figure

4

and

interlock

switches

(

2

)

Figure

2

,

are

provided

between

the

breaker

and

metal

-

clad

unit

to

prevent

raising

or

lowering

of

the

breaker

in

the

unit

while

in

a

closed

position

and

to

prevent

a

closing

operation

when

the

breaker

is

not

in

either

the

fully

raised

or

lowered

position

.

To

insure

that

this

interlock

will

function

during

manual

,

as

well

as

during

electrical

operation

of

the

equipment

,

both

mechan

-

ical

and

electrical

blocking

is

provided

.

If

for

any

reason

the

closing

springs

should

be

discharged

against

the

positive

interlock

the

mechanism

will

be

jammed

and

be

inoperable

.

The

mechanism

can

be

released

and

returned

to

the

reset

position

by

pushing

in

on

the

trip

lever

(

8

)

Figure

5

.

It

may

require

more

than

normal

force

to

release

the

interlock

.

A

plunger

interlock

,

Figure

14

can

be

provided

when

required

to

operate

a

stationary

auxiliary

switch

and

/

or

a

rod

interlock

mounted

in

the

metal

-

clad

unit

.

When

the

breaker

is

used

interchangeably

with

type

MS

-

13

solenoid

operated

breakers

in

M

-

36

metal

-

clad

units

,

fuses

are

mounted

on

the

^

breaker

for

protection

of

the

motor

and

closing

circuit

.

These

breakers

are

identified

by

either

a

^

"

C

"

,

"

F

"

or

"

J

"

suffix

in

the

breaker

nomenclature

.

In

cases

where

breakers

with

type

ML

-

13

mechanisms

must

match

and

line

up

with

breakers

having

type

ML

-

11

mechanisms

the

spring

charging

circuit

for

both

mechanisms

should

be

fused

with

Buss

Company

Fusetrons

as

follows

:

Cat

.

No

.

Cont

.

Volt

.

Fuse

Size

FRN

10

FRN

4

FRN

4

FRN

4

FRN

2.5

FRN

2.5

FRN

2.5

48

v

d

-

c

HOv

d

-

c

125

v

d

-

c

115

v

a

-

c

220

v

d

-

c

250

v

d

-

c

230

v

a

-

c

10

A

4

A

4

A

4

A

2.5

A

2.5

A

2.5

A

•

’

4

ff

I

iitic

fails

1

MSHS

12

b

2

mg

PriMa

*

A

'

3

n

at

-

4

Ilia

5

tmm

6

ipLh

•

V

7

'

8

9

*

s

»

Sska

)

Sis

'

10

1

—

Figure

4

.

(

8038804

)

Right

Side

View

ML

-

13

Operating

Mechanism

Figure

5

.

(

8040934

)

Front

View

ML

-

13

Operating

Mechanism

.

1

.

Upper

Spring

2

.

Latching

Pawls

3

.

Positive

Interlock

Roller

4

.

Opening

Spring

5

.

Cam

Shaft

6

.

Ratchet

Wheel

7

.

Bearing

Block

8

.

Driving

Pawl

9

.

Lower

Spring

10

.

Driving

Pawl

Lever

11

.

Eccentric

12

.

Closing

Spring

1

.

Auxiliary

Switch

Open

-

Close

Indicator

Trip

Coil

Prop

Springs

Operation

Counter

Trip

Latch

Charge

-

Discharge

Indicator

Manual

Trip

Lever

Manual

Close

Button

Motor

2

.

3

.

4

.

5

.

6

.

7

.

8

.

9

.

10

.

6

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

of

the

ratchet

wheel

rotation

the

power

switches

(

7

)

are

opened

and

the

driving

pawl

is

raised

from

the

ratchet

wheel

surface

.

This

allows

the

motor

and

driving

mechanism

to

coast

to

a

natural

stop

expending

all

residual

energy

.

During

the

time

the

springs

are

being

com

-

pressed

a

relay

(

17

)

Figure

6

,

is

energized

to

hold

the

closing

circuit

open

.

The

relay

remains

energized

until

the

springs

are

fully

charged

and

the

control

switch

contacts

are

re

-

set

.

Spring

Charging

The

mechanism

has

a

high

speed

gear

motor

(

10

)

Figure

5

,

that

compresses

a

set

of

closing

springs

through

the

action

of

an

eccentric

,

ratchet

,

and

pawl

assembly

.

The

rotary

action

of

the

motor

is

converted

to

a

straight

stroke

through

the

eccentric

(

11

)

Figure

4

,

and

a

lever

that

carries

a

spring

loaded

driving

pawl

(

2

)

Figure

1

.

The

pawl

advances

the

ratchet

wheel

(

6

)

Figure

4

a

few

degrees

each

stroke

where

it

is

held

in

position

by

the

latching

pawls

(

2

)

.

When

the

ratchet

wheel

has

been

rotated

approximately

180

degrees

the

closing

springs

(

12

)

will

be

fully

compressed

.

As

the

ratchet

wheel

continues

to

rotate

,

the

spring

load

will

shift

over

center

and

attempt

to

discharge

.

After

a

few

degrees

of

rotation

,

the

closing

roller

(

6

)

Figure

2

,

will

engage

the

closing

latch

(

8

)

and

the

compressed

springs

will

be

held

by

the

latch

until

a

closing

operation

is

required

.

During

the

last

few

degrees

The

closing

springs

may

be

charged

manually

if

control

voltage

is

lost

.

A

5

/

8

"

ratchet

wrench

can

be

used

to

rotate

the

eccentric

in

a

counter

clock

-

wise

direction

until

the

indicator

reads

"

Charged

"

and

the

driving

pawl

is

raised

from

the

ratchet

wheel

.

The

use

of

the

ratchet

wrench

provides

for

maximum

safety

in

the

event

that

control

power

is

suddenly

restored

without

warning

.

In

this

event

,

the

motor

drive

will

override

the

ratchet

wrench

and

continues

to

charge

the

springs

.

1

2

3

4

5

6

8

I

_

9

S

.

IQ

11

12

13

14

wm

16

17

Figure

6

.

(

8040933

)

Control

Mechanism

Latch

Monitoring

Switch

Mounting

Bracket

Closing

Solenoid

Closing

Coil

Support

Control

Relay

13

.

Power

Switches

Closing

Latch

Closing

Latch

Shaft

15

.

Latch

Adjusting

Screw

16

.

Closing

Coil

Bolts

Closing

Latch

Spring

1

.

Latch

Checking

Switch

Cam

Switch

Striker

Switch

Support

Bolts

Switch

Support

Closing

Latch

Roller

7

.

14

.

2

.

8

.

3

.

9

.

4

.

10

.

17

.

5

.

11

.

6

.

12

.

7

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

Closing

Operation

Opening

Operation

The

breaker

can

be

closed

electrically

by

energizing

the

closing

solenoid

(

15

)

Figure

6

,

or

manually

by

pushing

the

close

button

(

9

)

Figure

5

.

In

either

method

the

closing

latch

is

rotated

from

under

the

closing

roller

to

release

the

closing

springs

(

9

)

Figure

2

.

The

energy

in

the

springs

is

used

to

rotate

a

cam

(

8

)

Figure

7

,

and

close

the

breaker

through

the

operating

mechanism

linkage

.

During

the

closing

operation

,

the

mech

-

anism

is

trip

-

free

at

all

times

.

The

breaker

is

held

closed

by

the

closing

prop

(

5

)

moving

into

position

under

the

prop

(

4

)

.

During

the

closing

operation

the

opening

springs

(

4

)

Figure

4

,

are

compressed

and

held

ready

for

an

opening

operation

with

the

trip

latch

(

17

)

Figure

7

bearing

against

the

trip

latch

roller

(

19

)

.

When

the

closing

operation

of

the

breaker

is

completed

and

the

closing

latch

is

fully

reset

,

the

contacts

of

the

latch

monitoring

switch

closes

to

permit

the

spring

charging

motor

to

be

energized

and

recharge

the

closing

springs

.

The

breaker

can

be

opened

either

electrically

by

energizing

the

trip

coil

(

3

)

Figure

5

,

or

manually

by

pushing

the

trip

lever

(

8

)

.

In

each

method

the

trip

latch

is

rotated

off

the

trip

latch

roller

,

permitting

the

operating

mechanism

linkage

to

collapse

.

The

energy

stored

in

the

opening

springs

is

released

to

provide

the

required

opening

speed

for

successful

interruption

of

the

circuit

.

As

the

breaker

opens

to

interrupt

a

current

,

the

arc

first

starts

at

the

arcing

contacts

(

5

&

21

)

Figure

8

,

transfers

to

the

arc

runner

(

3

&

8

)

and

energizes

the

blow

-

out

coils

(

2

&

7

)

.

This

action

introduces

a

magnetic

field

between

the

pole

pieces

(

4

&

9

)

of

the

interrupter

that

forces

the

arc

deeper

into

the

arc

chute

(

6

)

.

At

the

time

the

arcing

contacts

part

a

discharge

of

air

is

expelled

through

the

booster

tube

(

22

)

across

the

arc

.

This

air

flow

assists

the

arc

transfer

and

interruption

by

blowing

the

arc

away

from

the

contacts

and

into

the

arc

chute

.

As

the

magnetic

field

forces

the

arc

deeper

into

the

interrupter

!

9

10

+

<

>

v

.

I

/

II

'

/

i

2

iirhii

21

i

.

3

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/

'

/

Jx

-

\

s

3

23

J

1

A

-

mt

-

_

J

4

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4

15

a

16

m

\

17

/

5

24

SI

18

25

6

19

26

\

/

j

v

\

i

I

'

i

I

'

A

/

20

cr

.

i

8

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\

I

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t

^

—

J

/

<

'

/

;

/

i

^

#

=

¥

rf

£

l

Figure

7

.

(

0134

C

3583

)

Sectional

Side

View

of

Mechanism

1

.

Main

Shaft

Bearing

Crank

Shaft

Cranks

Prop

Cam

Shaft

Cam

Shaft

Bearing

Cam

Handle

10

.

Trip

Coil

Support

Trip

Coil

Upper

Prop

Spring

Trip

Armature

Lower

Prop

Spring

Cam

Follower

Roller

Trip

Shaft

Trip

Latch

Stop

19

.

Trip

Latch

Roller

20

.

Trip

Latch

Roller

Support

21

.

Check

Nut

22

.

Stop

Plate

23

.

Spring

Rod

24

.

Spring

25

.

Spring

26

.

Spring

Guide

2

.

11

.

3

.

12

.

4

.

13

.

5

.

14

.

6

.

15

.

7

.

16

.

8

.

17

.

9

.

i

18

.

I

8

s

Courtesy of NationalSwitchgear.com

1

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

along

the

diverging

arc

runners

,

the

field

is

progressively

increased

by

the

insertion

of

each

additional

blow

-

out

coil

into

the

circuit

.

an

early

current

zero

the

arc

cannot

re

-

establish

itself

and

interruption

occurs

.

Trip

Free

Operation

The

arc

chute

has

a

series

of

interleaving

ceramic

fins

,

Figure

19

.

As

the

arc

is

forced

into

the

interrupter

it

is

lengthened

in

the

gradually

deepening

serpentine

path

between

the

fins

so

that

the

electrical

resistance

of

the

arc

is

rapidly

increased

and

its

heat

is

absorbed

by

the

ceramic

material

.

The

increased

resistance

reduces

the

magnitude

and

phase

angle

of

the

current

and

at

If

the

trip

coil

circuit

is

energized

while

the

breaker

is

closing

,

the

trip

armature

will

force

the

trip

latch

(

17

)

Figure

7

away

from

the

trip

roller

(

19

)

causing

the

mechanism

linkage

to

collapse

and

the

breaker

to

re

-

open

.

The

closing

cam

(

8

)

will

complete

its

closing

stroke

and

the

springs

will

re

-

charge

as

in

a

normal

closing

.

operation

.

£

2

10

II

12

13

2

O

14

3

15

1

i

16

4

17

5

18

6

19

7

20

8

21

22

9

23

*

24

1

“

I

1

y

Figure

8

.

(

0152

C

5904

)

Cross

Section

of

Breaker

Pole

Unit

17

.

Stationary

Primary

Contact

18

.

Movable

Primary

Contact

19

.

Hinge

Cup

Bearing

1

.

Lower

Pole

Pieces

Front

Bushing

Rear

Bushing

Upper

Horizontal

Barrier

2

Q

.

Contact

Arm

Assembly

Main

Operating

Crank

Spring

Retainer

Lower

Horizontal

Barrier

23

.

Connection

Bar

Operating

Rod

Box

Barrier

Upper

Blow

-

Out

Coil

Upper

Arc

Runner

Upper

Pole

Pieces

Stationary

Arcing

Contact

Arc

Chute

Side

Lower

Blow

-

Out

Coil

Lower

Arc

Runner

9

.

2

.

10

.

3

.

11

.

12

.

4

.

13

a

21

.

Movable

Arcing

Contact

22

.

Booster

Tube

and

Piston

5

.

6

.

14

.

7

.

15

.

24

.

Booster

Cylinder

8

.

16

.

9

i

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

ADJUSTMENTS

the

movable

primary

contact

(

2

)

should

be

5

/

16

"

or

greater

.

This

setting

has

been

made

in

the

factory

and

no

adjustment

is

provided

.

A

wipe

of

less

than

5

/

16

"

is

an

indication

that

the

arcing

contacts

need

to

be

replaced

.

When

making

this

check

,

see

that

there

is

clearance

between

the

arcing

contact

(

5

)

and

the

slot

in

the

throat

baffle

(

7

)

during

entire

stroke

of

the

moving

contact

assembly

.

Primary

Contact

Wipe

All

adjustments

should

be

checked

during

periodic

inspections

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

after

removing

the

box

barriers

and

front

cover

from

the

breaker

.

DO

NOT

WORK

ON

EITHER

THE

BREAKER

OR

MECHANISM

UNLESS

THE

CLOSING

SPRINGS

ARE

BLOCKED

AND

THE

OPENING

SPRINGS

HAVE

BEEN

TRIPPED

OPEN

OR

MECHANICALLY

BLOCKED

.

PREVENT

ACCIDENTAL

CLOSING

OR

TRIPPING

.

Refer

to

Figure

9

,

when

the

breaker

is

closed

the

stationary

primary

contacts

(

1

)

should

rise

^

from

1

/

4

"

to

5

/

l

6

"

.

Before

checking

this

dimen

-

sion

be

sure

the

mechanism

is

re

-

set

so

that

^

the

prop

(

4

)

Figure

7

is

resting

on

the

prop

.

To

obtain

the

proper

contact

adjustment

,

open

the

breaker

,

and

,

referring

to

Figure

10

,

loosen

the

check

nut

(

4

)

and

turn

the

adjusting

nut

(

3

)

.

Screwing

up

on

the

adjusting

nut

will

decrease

the

primary

contact

wipe

,

down

will

increase

it

.

Tighten

the

check

nut

,

close

the

breaker

and

THIS

MEASURE

IS

REQUIRED

TO

Arcing

Contact

Wipe

Refer

to

Figure

9

.

Close

the

breakeruntil

the

arcing

contacts

just

touch

.

This

can

be

determined

with

the

use

of

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

In

this

position

,

the

gap

between

the

stationary

primary

contacts

(

1

)

and

D

5

*

1

«

.

?

2

3

4

<

o

5

7

Primary

Contact

Wipe

Arcing

Contact

Wipe

Figure

9

.

(

0132

C

2778

)

Contact

Adjustments

i

.

Stationary

Primary

Contacts

Movable

Primary

Contacts

Buffer

Block

Stationary

Arcing

Contacts

5

.

Movable

Arcing

Contacts

6

.

Contact

Arm

7

.

Throat

Baffle

2

.

3

.

4

10

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

recheck

the

wipe

.

With

the

primary

contact

wipe

correctly

adjusted

,

the

clearance

between

the

contact

arm

(

6

)

Figure

9

and

the

buffer

block

(

3

)

should

be

1

/

16

”

or

greater

when

the

breaker

is

fully

closed

.

Primary

Contact

Gap

Trip

Latch

Wipe

Refer

to

Figure

7

.

The

wipe

of

the

trip

latch

(

17

)

on

the

trip

roller

(

19

)

should

be

from

3

/

16

”

to

1

/

4

”

.

This

can

be

measured

by

putting

a

film

of

grease

on

the

latch

,

closing

the

breaker

part

way

,

and

trippingo

The

mechanism

has

the

proper

trip

latch

wipe

when

the

latch

rests

against

the

stop

(

18

)

.

No

adjustment

is

provided

and

a

visual

inspection

is

usually

all

that

is

required

.

If

this

setting

is

not

correct

,

look

for

insufficient

travel

of

the

trip

shaft

(

16

)

.

Trip

Armature

Travel

Refer

to

Figure

10

.

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

(

8

)

measured

between

the

closest

points

,

should

be

5

-

1

/

8

”

to

5

-

9

/

16

”

.

To

change

this

gap

,

loosen

the

check

nut

(

21

)

Figure

7

,

and

turn

the

adjusting

nut

(

22

)

on

stud

(

23

)

.

Screwing

the

adjusting

nut

down

will

decrease

the

primary

contact

gap

.

Tighten

the

check

nut

and

re

-

measure

the

contact

gap

(

close

and

trip

the

breaker

before

checking

the

measurement

)

.

Refer

to

Figure

7

.

The

trip

armature

(

13

)

should

have

7

/

32

”

to

9

/

32

”

travel

before

the

trip

latch

(

17

)

starts

to

move

.

This

can

be

adiusted

by

moving

the

trip

coil

support

(

10

)

and

/

or

by

adjusting

the

trip

arm

screw

(

10

)

Figure

11

.

A

locking

screw

located

behind

the

trip

arm

screw

must

first

be

loosened

.

Retighten

locking

screw

after

making

adjustment

.

Closing

Latch

Wipe

WHEN

WORKING

ON

THE

MECHANISM

IN

THE

CLOSED

POSITION

,

KEEP

FINGERS

CLEAR

OF

THE

LINKAGE

,

AS

ACCIDENTAL

TRIPPING

’

CAN

CAUSE

SEVERE

INJURY

.

Refer

to

Figure

6

.

The

wipe

between

the

closing

latch

(

8

)

and

roller

(

6

)

should

be

3

/

16

”

to

1

/

4

”

.

If

re

-

setting

is

required

,

loosen

,

set

,

and

retighten

adjustment

nut

and

screw

(

10

)

.

Closing

Latch

Monitoring

Switch

.

Refer

to

Figure

6

.

The

closing

latch

must

be

fully

re

-

set

and

the

latch

monitoring

switch

(

13

)

operated

before

the

motor

will

start

.

When

the

latch

is

fully

re

-

set

the

clearance

between

the

switch

striker

arm

and

the

switch

mounting

bracket

(

14

)

is

1

/

32

”

or

less

,

this

can

be

adjusted

by

bending

the

striker

arm

.

Motor

and

Relay

Switches

Refer

to

Figure

6

.

With

the

closing

springs

blocked

rotate

the

switch

cam

(

2

)

until

the

switch

striker

(

3

)

has

traveled

the

maximum

amount

(

about

180

degrees

rotation

of

cam

)

.

At

this

point

the

clearance

between

the

striker

and

the

switch

support

(

5

)

should

be

1

/

32

”

or

less

.

This

can

be

adjusted

by

loosening

the

switch

support

mounting

bolts

(

4

)

and

rotating

the

support

.

PM

:

'

1

I

ft

?

a

Interlock

Switch

Wipe

10

.

(

8038802

)

Adjustable

Coupling

For

Making

Primary

Contact

Wipe

Adjustments

Figure

Refer

to

Figure

12

.

With

the

positive

interlock

in

the

reset

,

or

normal

position

the

clearance

between

the

interlock

switch

arm

(

2

)

and

the

switch

mounting

plate

(

3

)

should

be

1

/

32

"

or

less

.

This

can

be

adjusted

by

bending

the

switch

arm

.

1

.

Operating

Rod

Operating

Rod

Adjusting

Nut

Check

Nut

Stationary

Primary

Contacts

Yoke

Contact

Arm

Movable

Primary

Contacts

2

.

3

.

4

.

Driving

Pawl

Adjustment

Refer

to

Figure

4

.

The

driving

pawl

(

8

)

must

advance

the

ratchet

wheel

(

6

)

sufficiently

5

.

6

.

7

.

8

.

11

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

if

2

5

6

3

7

4

Figure

11

.

(

8040934

)

Auxiliary

Switch

and

Trip

CoiL

1

.

Trip

Latch

Spring

2

.

Switch

Arm

3

.

Spring

Discharge

Crank

4

.

Cotter

5

.

Trip

Coil

Support

6

.

Trip

Coil

7

.

Mounting

Bolts

8

.

Latch

Set

Screws

9

o

Trip

Latch

10

.

Trip

Arm

Screw

11

.

Manual

Trip

Lever

Figure

12

.

(

8040933

)

Positive

Interlock

Switch

Positive

Interlock

Shaft

Switch

Arm

Switch

Support

Interlock

Switch

Latch

Checking

Switch

Arm

Trip

Shaft

1

.

2

.

30

4

.

50

6

.

7

.

on

each

stroke

to

allow

the

latching

pawls

(

2

)

to

fall

into

the

ratchet

teeth

.

This

should

be

checked

with

the

closing

spring

load

against

the

driving

members

.

With

the

mechanism

unblocked

,

hand

charge

the

closing

springs

with

the

manual

charging

wrench

until

they

are

slightly

more

than

half

charged

.

Slowly

rotate

the

charging

wrench

until

the

driving

pawl

has

traveled

through

its

return

stroke

and

check

the

maximum

clearance

between

the

pawl

and

the

ratchet

tooth

.

Rotate

the

charging

wrench

until

the

driving

pawl

has

advanced

the

ratchet

tooth

to

its

maximum

travel

.

Now

check

the

clearance

between

the

ratchet

tooth

and

the

latching

pawl

.

The

clearance

should

be

approximately

equal

for

both

the

driving

and

latching

pawls

andnotless

than

.

015

"

in

either

case

.

If

adjustment

is

required

for

either

pawl

the

springs

must

first

be

fully

charged

and

blocked

.

Loosen

seven

motor

support

bolts

(

1

)

Figure

15

,

and

move

entire

motor

assembly

to

the

rear

if

the

clearance

is

under

the

minimum

at

the

latching

pawls

,

and

to

the

front

if

the

clearance

is

under

the

minimum

at

the

driving

pawl

.

Move

the

motor

assembly

approximately

twice

the

dimensional

increase

required

at

the

pawl

.

Be

certain

the

motor

assembly

is

moved

straight

forward

or

rearward

and

tighten

the

one

bolt

on

the

right

side

of

the

mounting

frame

first

to

assure

proper

alighment

.

After

tightening

the

remaining

bolts

the

springs

should

be

released

and

the

clearance

again

checked

as

described

above

.

AUXILIARY

DEVICES

Latch

Checking

Switch

Refer

to

Figure

13

.

Charge

the

closing

springs

sufficiently

to

reset

the

mechanism

linkage

.

Rotate

the

trip

latch

(

4

)

by

pressing

the

manual

trip

lever

to

open

the

latch

checking

switch

(

2

)

.

Allow

the

trip

latch

to

reset

slowly

and

determine

the

point

at

which

the

contacts

are

made

by

using

a

circuit

continuity

tester

(

light

indicator

,

bell

set

,

etc

)

o

The

contacts

of

the

latch

checking

switch

should

just

make

when

the

gap

between

the

trip

latch

(

4

)

and

the

stop

(

5

)

located

on

the

latch

roller

link

(

7

)

is

1

/

16

”

.

There

should

be

a

minimum

of

1

/

64

”

between

the

switch

arm

(

3

)

and

the

switch

support

(

1

)

.

justment

of

the

latch

checking

switch

,

bend

the

latch

checking

switch

arm

(

3

)

.

To

obtain

ad

-

12

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

UEK

-

7345

5

-

1

/

8

"

to

Primary

contact

gap

:

5

-

9

/

16

"

.

Trip

latch

wipe

:

3

/

16

"

to

1

/

4

"

with

trip

latch

resting

against

stop

.

Trip

armature

travel

7

/

32

"

to

9

/

32

"

.

Closing

latch

wipe

:

3

/

16

"

to

1

/

4

"

.

Closing

latch

monitoring

switch

:

Max

-

imum

clearance

1

/

32

"

.

Plunger

Interlock

Refer

to

Figure

14

.

With

the

breaker

in

the

closed

position

,

the

vertical

distance

"

A

"

from

the

top

of

the

plunger

bolt

(

1

)

to

the

bottom

of

the

breaker

lifting

rail

(

3

)

should

be

11

-

7

/

32

"

to

11

-

11

/

32

"

.

To

change

this

adjustment

,

add

or

remove

washers

(

2

)

.

Auxiliary

Fuses

On

breakers

with

either

a

"

C

"

,

"

F

"

or

"

J

"

suffix

,

a

set

of

protecting

fuses

is

mounted

on

the

front

of

the

breaker

.

These

fuses

are

the

primary

protective

devices

for

the

closing

control

circuit

on

those

breakers

that

are

used

in

metal

-

clad

units

designed

for

solenoid

operated

breakers

.

Inspection

and

Test

1

.

For

ease

in

reviewing

the

adjustments

,

the

following

are

recapitulated

:

a

.

Primary

contact

wipe

:

1

/

4

”

to

5

/

16

"

.

b

.

Arcing

contact

wipe

:

5

/

16

"

or

greater

gap

at

primary

contacts

.

c

.

d

.

e

.

f

.

g

.

Motor

and

relay

switch

:

clearance

1

/

32

"

.

Interlock

switch

:

maximum

clearance

1

/

32

"

.

Driving

and

Latching

Pawl

:

minimum

clearance

to

ratchet

teeth

.

015

"

.

Latch

checking

switch

contacts

make

when

the

gap

between

the

trip

latch

and

the

stop

is

1

/

16

"

.

Plunger

interlock

:

11

-

11

/

32

"

.

h

.

maximum

l

.

J

.

k

.

11

-

7

/

32

"

to

1

.

2

.

Check

all

nuts

,

washers

,

bolts

,

cotterpins

,

and

terminal

connections

for

tightness

.

3

Figure

14

.

(

8034464

)

Plunger

Interlock

1

.

Plunger

Bolt

2

.

Washer

3

.

Breaker

Lifting

Rail

Figure

13

.

(

0114

C

5320

)

Latch

Checking

Switch

1

.

Switch

Support

2

.

Latch

Checking

Switch

3

.

Switch

Arm

4

.

Trip

Latch

5

.

Reset

Stop

6

.

Latch

Roller

7

.

Latch

Roller

Link

8

.

Latch

Roller

13

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

Opening

and

Closing

Speeds

Inspect

all

wiring

to

make

sure

that

no

damage

has

resulted

during

installation

,

and

test

for

possible

grounds

or

short

circuits

.

See

that

all

bearing

surfaces

of

the

mechanism

have

been

lubricated

.

Refer

to

the

section

on

LUBRICATION

.

(

Page

18

and

Figure

17

)

.

Operate

the

breaker

slowly

with

the

manual

charging

wrench

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

.

See

that

any

place

where

the

surface

of

the

paint

has

been

damaged

is

repainted

immediately

.

Check

the

trip

coil

plunger

and

the

closing

coil

plunger

to

see

that

they

move

freely

.

3

.

The

closing

speed

of

the

arcing

contact

of

the

breaker

should

be

a

minimum

of

11

feet

per

second

.

This

represents

the

average

speed

of

the

movable

arcing

contact

from

a

point

3

"

before

the

tip

is

tangent

to

the

lower

surface

of

the

probes

on

the

upper

arc

runner

to

the

tangent

position

.

The

opening

speed

of

the

arcing

contact

should

be

a

minimum

of

15

feet

per

second

.

This

represents

the

average

speed

over

3

"

from

the

point

when

the

tip

on

the

movable

arcing

contact

is

tangent

to

the

lower

surface

of

the

probes

on

the

upper

runner

.

Proper

servicing

and

lubrication

of

the

breaker

and

its

operating

mechanism

should

maintain

these

speeds

and

no

adjustments

is

provided

.

Control

Power

Check

4

.

5

.

6

.

7

.

After

the

breaker

has

been

operated

several

times

with

the

manual

charging

wrench

and

the

mechanism

adjustments

are

checked

as

described

,

the

operating

voltages

should

be

checked

at

the

closing

coil

,

trip

coil

,

and

motor

terminals

.

Control

Power

for

electrical

operation

of

the

breaker

may

be

from

either

an

alternating

or

direct

current

source

.

The

operating

ranges

for

the

closing

and

tripping

voltages

as

given

on

the

breaker

nameplate

,

are

as

follows

:

Nominal

Voltage

Closing

Range

Tripping

Range

Jl

MB

ii

Si

®

mm

*

im

24

v

d

-

c

48

v

d

-

c

llOv

d

-

c

125

v

d

-

c

220

v

d

-

c

250

v

d

-

c

115

v

a

-

c

230

v

a

-

c

14

-

30

v

d

-

c

28

-

60

v

d

-

c

60

-

125

v

d

-

c

70

-

140

v

d

-

c

120

-

250

v

d

-

c

140

-

280

v

d

-

c

95

-

125

v

a

-

c

190

-

250

v

a

-

c

m

1

34

-

50

v

d

-

c

80

-

115

v

d

-

c

90

-

130

v

d

-

c

160

-

230

v

d

-

c

180

-

260

v

d

-

c

95

-

125

v

a

-

c

190

-

250

v

a

-

c

2

m

mm

*

5

3

6

.

II

;

.

*

,

7

:

2

8

4

'

9

1111

m

mm

f

@

§

l

§

il

Ifi

SSM

:

If

the

closed

circuit

voltage

at

the

terminals

of

the

coil

or

motor

does

not

fall

in

the

specified

range

,

check

the

voltage

at

the

source

of

power

and

line

drop

between

the

power

source

and

breaker

.

5

m

w

mmsm

When

two

or

more

breakers

operating

from

the

same

control

power

source

are

required

to

close

simultaneously

,

the

closed

circuit

voltage

at

the

closing

coil

or

motor

of

each

breaker

must

fall

within

the

specified

limits

.

Figure

15

.

(

8040931

)

Driving

Elements

1

.

Mounting

Bolts

Manual

Close

Button

Motor

Retaining

Ring

Eccentric

Retaining

Ring

Hex

Charging

Stud

Driving

Link

Motor

Support

2

.

3

.

Electrical

closing

or

opening

is

accomplished

by

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

or

close

the

breaker

manually

by

pressing

the

manual

trip

lever

(

8

)

Figure

5

,

or

the

manual

close

button

(

9

)

.

4

.

5

.

6

.

I

7

.

8

.

9

.

I

14

:

I

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

GENERAL

MAINTENANCE

"

i

Interrupters

GENERAL

Since

there

are

no

moving

parts

,

the

inter

-

rupters

of

a

magne

-

blast

breaker

will

normally

require

little

or

no

inspection

unless

there

is

evidence

of

damage

to

the

arc

chutes

sides

or

contamination

in

the

throat

area

.

If

either

of

these

conditions

are

present

the

interrupters

should

be

removed

from

the

breaker

and

the

following

points

noted

:

Safe

and

dependable

service

from

electrical

apparatus

and

power

systems

is

contingent

upon

reliable

performance

of

power

circuit

breakers

.

To

obtain

maximum

reliability

the

breaker

should

be

inspected

and

maintained

on

a

regular

schedule

.

The

breakers

are

designed

in

accordance

with

applicable

standards

which

require

that

they

be

capable

of

performing

up

to

5000

operations

for

1200

ampere

breakers

and

3000

operations

for

2000

ampere

breakers

switching

rated

continuous

current

before

any

replacement

of

parts

should

be

necessary

.

This

requirement

is

based

on

the

breakers

being

serviced

,

or

maintained

,

at

least

every

2000

operations

,

or

once

per

year

,

whichever

comes

first

.

If

the

breaker

is

also

required

to

interrupt

fault

currents

during

this

period

of

time

additional

maintenance

and

replacement

of

parts

may

be

necessary

.

The

throat

area

of

the

interrupter

should

be

cleaned

with

sandpaper

(

Do

Not

use

emery

cloth

or

other

metallic

abrasives

)

.

All

flat

areas

on

either

side

of

the

movable

arcing

contact

travel

should

be

sanded

.

Do

not

sand

or

otherwise

attempt

to

clean

the

ceramic

fins

of

the

arc

chute

sides

or

throat

pieces

.

Heavily

contaminated

parts

should

be

replaced

.

l o

2

.

Cracks

which

have

formed

in

the

fins

of

the

arc

chute

are

to

be

expected

in

ceramic

materials

of

this

type

when

sub

-

jected

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

.

3

.

If

the

arc

chute

has

suffered

any

mech

-

anical

injury

due

to

dropping

or

accidental

striking

,

resulting

in

the

actual

breaking

off

of

fins

,

replacement

will

be

necessary

.

Small

broken

corners

on

the

exhaust

end

of

the

arc

chutes

will

not

interfere

with

its

performance

and

can

be

disregarded

.

4

.

The

plastisol

flexible

covering

for

the

pole

pieces

(

5

)

&

(

8

)

Figure

18

and

the

upper

mounting

support

(

12

)

should

be

inspected

for

breaks

in

the

insulation

.

If

there

are

holes

or

breaks

in

the

insulation

they

should

be

repaired

or

the

part

replaced

.

Interrupter

Removal

and

Replacement

Refer

to

Figure

16

.

An

arc

chute

lifter

is

normally

furnished

with

the

metal

-

clad

switchgear

for

use

in

removing

and

replacing

the

interrupters

of

the

AM

-

13.8

-

750

breakers

.

When

the

lifter

is

not

available

an

overhead

crane

or

portable

hoist

may

be

used

.

The

arc

chute

lifter

is

assembled

to

the

top

plate

of

the

breaker

as

shown

in

the

reference

figure

.

Before

assembling

the

lifter

on

the

breaker

it

is

necessary

to

remove

the

box

barrier

.

For

breaker

types

"

H

"

and

"

N

”

,

assemble

the

arc

chute

lifter

(

4

)

as

shown

in

Figure

16

A

using

the

bolt

(

5

A

)

located

between

the

front

and

rear

bushings

.

For

breaker

types

”

F

"

,

”

J

”

,

”

K

”

,

and

"

L

”

,

bolt

the

angle

support

(

5

B

)

Figure

16

B

across

the

front

of

the

top

plate

using

the

two

5

/

8

”

tapped

holes

provided

.

Position

the

arc

chute

lifter

(

4

)

over

the

rear

bushing

and

into

the

proper

slots

in

the

support

angle

.

BEFORE

ANY

MAINTENANCE

WORKISPER

-

FORMED

,

MAKE

CERTAIN

THAT

ALL

CONTROL

CIRCUITS

ARE

DE

-

ENERGIZED

AND

THAT

THE

BREAKER

IS

REMOVED

FROM

THE

METAL

-

CLAD

UNIT

.

DO

NOT

WORK

ON

THE

BREAKER

OR

MECHANISM

WHILE

IN

THE

CLOSED

POSI

-

TION

UNLESS

THE

PROP

AND

TRIP

LATCH

HAVE

BEEN

SECURELY

WIRED

OR

BLOCKED

TO

PREVENT

ACCIDENTAL

TRIPPING

.

DO

NOT

WORK

ON

THE

BREAKER

OR

MECHANISM

WHILE

THE

SPRINGS

ARE

CHARGED

UNLESS

THEY

ARE

SECURED

IN

THAT

POSITION

BY

THE

MAINTENANCE

SPRING

BLOCKING

DEVICE

.

PERIODIC

INSPECTION

The

frequency

of

the

inspection

and

maintenance

operations

required

should

be

determined

by

each

operating

company

and

will

depend

on

the

application

of

the

breakers

and

the

operating

conditions

.

Factors

which

should

be

considered

are

:

Importance

of

the

breaker

to

overall

plant

or

system

operation

;

number

of

operations

and

magnitude

of

currents

switched

by

breaker

;

frequency

of

fault

inter

-

ruptions

;

and

the

atmospheric

conditions

in

which

the

breaker

normally

operates

.

Extreme

conditions

of

dust

,

moisture

,

corrosive

gases

etc

.

,

can

indicate

that

inspection

and

maintenance

will

be

required

more

frequently

than

every

2000

opera

-

tions

.

Very

clean

dry

operating

conditions

with

low

current

switching

duty

can

justify

a

longer

period

of

time

between

inspections

.

Any

time

a

breaker

is

known

to

have

interrupted

a

fault

at

or

near

its

rating

it

is

recommended

that

the

breaker

be

inspected

and

necessary

maintenance

be

performed

as

soon

after

the

interruption

as

is

practical

.

It

is

also

recommended

that

an

initial

inspection

be

made

of

new

breakers

after

the

first

500

operations

or

six

months

after

being

put

in

service

,

whichever

comes

first

.

The

following

instructions

give

the

items

that

should

be

included

in

an

inspection

and

general

recommendations

on

the

maintenance

of

breakers

.

i

15

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

To

reassemble

the

interrupter

to

the

breaker

,

rest

the

lower

interrupter

'

support

(

13

)

on

the

support

bracket

(

12

)

.

Slide

the

arc

chute

forward

,

lifting

it

slightly

to

engage

the

supporting

bolts

(

9

)

in

the

slots

of

the

upper

interrupter

support

.

Check

to

assure

that

the

upper

insulation

(

16

)

Figure

18

,

is

properly

positioned

within

the

barrier

suspended

from

the

stationary

contact

support

(

11

)

Figure

23

.

Tighten

the

supporting

bolts

(

9

)

and

(

11

)

Figure

16

.

These

bolts

serve

as

both

the

electrical

and

mechanical

connections

between

the

bushings

and

the

arc

runners

within

the

interrupter

.

Check

that

the

movable

arcing

contact

(

10

)

passes

between

the

probds

on

the

upper

arc

runner

(

9

)

Figure

19

without

touching

.

Lower

the

grappling

hooks

(

6

)

by

turning

the

handle

(

1

)

until

they

can

be

placed

over

the

lifting

bolts

(

8

)

on

the

interrupter

.

Turn

the

handle

to

raise

the

hooks

until

they

begin

to

lift

the

interrupter

.

To

remove

the

interrupter

,

loosen

the

two

upper

supporting

bolts

(

9

)

and

the

one

lower

support

bolt

(

11

)

using

a

standard

3

/

4

"

wrench

.

Raise

the

assembly

approximately

3

/

8

"

and

continue

to

raise

the

interrupter

and

gently

move

it

from

side

to

side

until

both

upper

and

lower

supports

are

disconnected

,

arc

chute

lifter

towards

the

rear

of

the

breaker

and

lower

the

interrupter

to

a

resting

position

on

the

floor

.

Support

the

interrupter

from

falling

over

and

remove

the

grappling

hooks

.

t

Move

the

trolley

(

3

)

of

the

m

an

HII

a

2

m i

i i

3

E i

i

a

g

a

•

zsrwjy

4

5

A

I

6

mm

7

is

%

I

;

is

3

1

.

*

1

$

V

3

Figure

16

B

.

(

8034810

)

Breaker

Type

F

,

J

,

K

,

&

L

Figure

16

A

.

(

8034809

)

Breaker

Type

H

&

N

m

Figure

16

.

Interrupter

Partially

Removed

Showing

Accessibility

of

Arcing

Contacts

8

.

Lifting

Bolts

9

.

Upper

Supporting

Bolts

10

.

Movable

Arcing

Contact

11

.

Lower

Supporting

Bolt

12

.

Support

Bracket

13

.

Lower

Interrupter

Support

14

.

Interrupter

1

.

Handle

2

.

Rear

Bushing

3

.

Trolley

4

.

Arc

Chute

Lifter

5

A

.

Arc

Chute

Lifter

Bolt

5

B

.

Angle

Support

6

.

Grappling

Hooks

7

.

Upper

Interrupter

Support

¥

x

.

~

.

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

refinished

with

either

clear

varnish

or

clear

resin

.

Allow

to

dry

smooth

and

hard

.

Breaker

Contacts

By

removing

the

box

barriers

the

movable

and

stationary

primary

contacts

and

the

movable

arcing

contacts

can

be

inspected

.

The

stationary

arcing

contacts

can

be

inspected

only

after

removing

the

interrupter

.

If

the

contacts

are

burned

or

pitted

,

they

can

be

made

smooth

with

a

fine

file

.

After

completing

inspection

of

the

contacts

,

check

the

contact

adjustments

as

specified

under

ADJUSTMENTS

.

All

other

insulation

parts

on

the

breaker

Smoke

or

dust

should

be

kept

clean

and

dry

.

collected

between

inspection

periods

should

be

wiped

off

,

and

if

dampness

is

apparent

,

heaters

should

be

installed

in

the

metal

-

clad

switchgear

to

insure

dryness

.

Insulation

Test

When

insulation

has

been

repaired

or

replaced

,

or

when

breaker

has

been

operating

in

adverse

moisture

conditions

,

it

is

recommended

that

the

insulation

be

checked

before

the

breaker

is

placed

back

in

service

.

A

standard

60

hertz

high

potential

test

at

27

,

000

volts

RMS

for

one

minute

will

normally

indicate

whether

the

breaker

is

satis

-

factory

for

service

.

With

the

breaker

contacts

in

the

fully

opened

position

,

apply

the

test

potential

to

each

terminal

of

the

breaker

individually

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

repair

or

replace

insulation

that

may

have

been

affected

by

moisture

absorption

.

If

the

breaker

secondary

wiring

is

to

be

given

a

hi

-

potential

test

at

1500

volts

,

remove

both

of

the

motor

leads

from

the

terminal

board

.

Failure

to

disconnect

the

motor

from

the

circuit

may

cause

damage

to

the

winding

insulation

.

Mechanism

A

careful

inspection

should

be

made

to

check

for

.

loose

"

nuts

,

bolts

,

and

loose

or

damaged

set

screws

or

other

locking

devices

.

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

manual

charging

wrench

,

open

and

close

the

breaker

several

times

to

make

certain

that

the

mechanism

operates

freely

throughout

its

entire

stroke

.

Check

the

mechanism

adjustments

as

specified

under

ADJUSTMENTS

.

Check

the

control

wiring

for

tightness

of

connections

and

damaged

insulation

.

Bushings

and

Insulation

The

surface

of

the

bushings

should

be

kept

clean

and

unmarred

to

prevent

moisture

absorption

.

If

the

insulation

surface

should

become

damaged

,

it

should

be

sanded

and

cleaned

,

and

should

be

ALTERNATE

LUBRICATION

(

REQUIRES

DISASSEMBLY

)

LUBRICATION

AT

MAINTENANCE

PERIOD

PARTS

Sleeve

Bearings

-

links

,

trip

shaft

,

etc

.

(

Teflon

coated

bearings

)

No

lubrication

required

No

lubrication

required

Sleeve

Bearings

-

main

crank

shaft

,

driving

pawl

lever

.

(

Bronze

or

cast

iron

)

Remove

bearings

or

links

,

clean

per

instructions

and

apply

D

50

H

15

lubricant

liberally

.

Light

application

of

machine

oil

SAE

20

or

SAE

30

.

Contact

Arm

Hinge

Assembly

Cup

Bearing

Loose

rings

between

bushing

and

contact

arm

No

lubrication

required

Wipe

clean

and

apply

D

50

H

47

.

Roller

and

Needle

Bearings

Light

application

of

machine

oil

SAE

20

or

SAE

30

.

Clean

per

instructions

and

repack

with

D

50

H

15

lubricant

.

Ground

surfaces

such

as

cams

,

ratchet

teeth

,

etc

.

(

Surfaces

coated

with

MoSg

)

No

lubrication

required

No

lubrication

required

1

Ground

surfaces

such

as

latches

,

rollers

,

prop

,

etc

.

Wipe

clean

and

apply

D

50

H

15

lubricant

.

Wipe

clean

and

apply

D

50

H

15

lubricant

Silver

plated

contacts

and

primary

disconnect

studs

Wipe

clean

and

apply

D

50

H

47

lubricant

Wipe

clean

and

apply

D

50

H

47

lubricant

.

Booster

Cylinder

Do

not

lubricate

Do

not

lubricate

Arcing

Contacts

Do

not

lubricate

Do

not

lubricate

Figure

17

.

Lubrication

Chart

17

Courtesy of NationalSwitchgear.com

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

and

using

a

stiff

brush

.

Do

not

remove

the

bearings

from

the

links

.

DO

NOT

USE

CARBON

TETRA

-

CHLORIDE

.

The

hinge

of

the

primary

contact

arm

(

19

)

Figure

8

,

should

be

disassembled

,

cleaned

,

and

lubricated

with

G

-

E

D

50

H

47

lubricant

at

general

overhaul

periods

.

The

main

shaft

bearings

(

1

)

Figure

7

and

the

bearings

in

driving

pawl

lever

(

10

)

Figure

4

,

should

be

removed

,

cleaned

,

and

lubricated

with

G

-

E

D

50

H

15

lubricant

at

general

overhaul

periods

.

Roller

and

Needle

Bearings

Lubrication

In

order

to

maintain

reliable

operation

,

it

is

important

that

all

circuit

breakers

be

properly

lubricated

at

all

times

.

Most

of

the

bearings

and

rolling

surfaces

utilize

a

new

type

of

dry

lubrication

that

will

require

no

maintenance

and

will

last

the

life

of

the

equipment

.

Only

few

bearings

and

surfaces

listed

in

the

chart

,

Figure

17

,

require

lubrication

.

These

have

been

properly

lubricated

during

assembly

at

the

factory

,

using

the

finest

grades

of

lubricants

available

.

However

,

even

the

finest

oils

and

greases

have

a

tendency

to

oxidize

with

age

,

as

evidence

by

hardening

and

darkening

in

color

.

Elimination

of

the

hardened

lubricant

is

essential

for

the

proper

operation

of

circuit

breakers

.

Also

frequent

operation

of

the

breaker

causes

the

lubricant

to

be

forced

out

from

between

the

bearing

surfaces

.

A

simple

lubrica

'

tion

will

often

clear

up

minor

disturbances

which

might

be

mistaken

for

more

serious

trouble

.

r

Bearings

in

the

cam

Refer

to

Figure

7

.

follower

(

15

)

,

latch

roller

(

19

)

,

and

cam

shaft

bearings

(

7

)

should

be

removed

from

the

mechanism

and

the

inner

race

disassembled

.

They

should

then

be

placed

in

a

container

of

clean

petroleum

solvent

or

similar

cleaner

.

TETROCHLORIDE

.

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

inductive

to

corrosion

.

If

the

bearings

are

touched

,

the

contamination

can

be

removed

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

lubricantD

50

H

15

being

sure

all

metal

parts

are

greased

.

The

inner

races

should

then

be

assembled

.

DO

NOT

USE

CARBON

A

definite

lubrication

schedule

should

be

set

up

taking

into

consideration

the

frequency

of

operation

of

the

breaker

and

local

conditions

.

It

is

recommended

that

lubrication

of

the

breaker

and

its

operating

mechanism

be

a

part

of

the

periodic

inspection

and

maintenance

program

,

with

not

more

than

a

two

year

period

between

lubrications

.

It

is

also

recommended

that

all

circuit

breakers

be

operated

at

regular

intervals

,

at

least

once

a

year

,

to

insure

the

lubrication

is

in

good

condition

and

the

breaker

is

operable

.

The

lubrication

chart

,

Figure

17

,

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

requires

no

disassembly

.

The

second

method

outlines

a

lubrication

procedure

similar

to

that

performed

on

the

breaker

at

the

factory

,

and

should

be

used

when

a

general

overhaul

of

the

breaker

is

necessary

.

General

Electric

Lubricant

D

50

H

15

andD

50

H

47

are

available

in

1

/

4

lb

.

collapsible

tubes

.

It

is

so

packaged

to

insure

cleanliness

and

to

prevent

oxidation

.

NOTE

:

If

it

becomes

necessary

to

clean

the

bearings

in

alcohol

(

shellac

thinner

)

,

be

sure

the

alcohol

is

perfectly

clean

,

and

do

not

allow

the

bearings

to

remain

in

the

alcohol

more

than

a

few

hours

o

If

it

is

desirable

to

leave

the

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

re

-

moved

from

the

alcohol

within

twenty

-

four

hours

.

Precautions

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

.

Washing

the

bearings

in

the

light

oil

,

draining

and

repacking

with

lubricant

D

50

H

15

should

follow

immediately

.

METHOD

OF

CLEANING

BEARINGS

Whenever

cleaning

of

bearings

is

required

,

as

indicated

in

the

lubrication

chart

,

the

following

procedures

are

recommended

.

Sleeve

Bearings

The

sleeve

bearings

used

throughout

the

linkage

utilize

Teflon

surfaces

and

do

not

require

lu

-

brication

.

surface

will

acquire

a

thin

black

film

.

Do

not

remove

this

film

unless

there

is

evidence

of

outside

contaminates

,

such

as

dry

or

hardened

grease

.

If

contaminants

are

present

they

should

be

removed

by

immersing

the

link

and

bearing

in

clean

petroleum

solvent

,

or

similar

cleaner

,

Bearings

that

are

pressed

into

the

frame

or

other

members

such

as

the

motor

support

(

9

)

Figure

15

,

should

not

be

removed

,

removing

the

shaft

and

inner

race

the

bearing

can

be

cleaned

satisfactorily

with

petroleum

solvent

or

a

similar

cleaner

and

a

stiff

brush

.

Follow

the

procedure

outlined

above

using

a

light

machine

oil

and

G

-

E

lubricant

D

50

H

15

before

reassembling

the

inner

race

and

shaft

.

After

a

number

of

operations

,

the

I

-

i

I

18

Courtesy of NationalSwitchgear.com

•

~

—

;

y

'

‘

.

'

v

y

-

v

Magne

-

Blast

Circuit

Breaker

GEK

-

7345

contact

replacement

.

)

If

the

contact

surfaces

are

only

roughened

or

galled

,

they

should

be

smoothed

with

crocus

cloth

or

draw

filed

.

After

contact

dressing

the

primary

contacts

should

be

greased

lightly

with

D

50

H

47

.

3

.

Arcing

Contacts

(

5

and

21

Figure

8

)

.

When

the

arcing

contact

wipe

is

less

than

the

minimum

specified

under

ADJUSTMENTS

,

the

contacts

should

be

replaced

.

The

contacts

should

be

inspected

for

uneven

wear

and

/

or

damage

using

a

mirror

to

inspect

the

stationary

contacts

.

Normally

it

will

not

be

necessary

to

remove

the

interrupters

for

this

2000

operation

servicing

unless

inadequate

wipe

or

contact

condition

indicate

a

need

for

replacement

,

are

removed

,

the

contact

braids

,

and

other

parts

subject

to

arcing

should

bt

checked

for

possible

cleaning

or

re

-

placement

.

Do

not

grease

the

arcing

contacts

under

any

circumstances

.

Rolling

Surfaces

A

number

of

rolling

and

rubbing

surfaces

in

the

mechanism

have

been

lubricated

with

a

baked

-

on

dry

,

molybdenum

disulfide

coating

,

lubrication

which

can

be

recognized

by

its

dark

,

almost

black

color

(

e

.

g

.

Face

of

switch

cam

(

5

)

Figure

2

)

requires

no

maintenance

and

should

last

the

life

of

the

breaker

.

Other

rolling

or

rubbing

surfaces

that

are

not

lubricated

with

molybdenum

disulfide

should

have

the

dried

,

dirty

grease

removed

and

a

thin

film

of

fresh

lubricant

D

50

H

15

applied

.

MAINTENANCE

Magne

-

blast

breakers

used

for

switching

arc

furnaces

or

capacitors

will

require

more

frequent

and

more

detailed

inspection

and

maintenance

because

of

the

repetitive

nature

of

the

applications

.

The

following

schedule

is

recommended

for

such

breakers

:

A

.

Every

500

Operations

:

1

.

Remove

the

box

barriers

.

This

If

the

interrupters

4

.

The

breaker

and

operating

mechanism

should

be

carefully

inspectedfor

loose

nuts

,

bolts

,

and

loose

or

damaged

set

screws

or

other

locking

devices

.

All

cam

,

latch

and

roller

surfaces

should

be

inspected

for

damage

or

excessive

wear

.

retainers

on

the

bottom

of

the

sta

-

tionary

contact

support

should

be

in

-

spected

for

possible

need

of

replace

-

ment

.

2

.

Wipe

all

insulating

parts

clean

of

smoke

deposit

and

dust

with

a

clean

dry

cloth

,

including

the

bushings

,

and

the

inside

of

the

box

barriers

.

3

.

All

flat

parts

in

the

throat

area

of

the

interrupters

should

be

thoroughly

cleaned

by

using

sandpaper

.

This

cleaning

should

be

performed

any

time

the

interrupter

is

removed

.

The

arc

chute

sides

and

throat

coolerfins

should

not

be

cleaned

.

Whenever

the

interrupter

is

removed

,

loose

dust

and

dirt

should

be

blown

out

before

replacing

arc

chutes

.

Throat

coolers

which

are

heavily

contaminated

should

be

replaced

.

4

.

Check

the

breaker

and

mechanism

adjustments

as

summarized

under

INSPECTION

AND

TEST

.

The

ne

-

cessary

readjustments

should

be

made

as

described

under

ADJUST

-

MENTS

.

B

.

Every

2000

Operations

,

or

Every

Six

Months

,

Whichever

Comes

First

:

1

.

In

addition

to

the

servicing

done

each

500

operations

,

the

following

inspec

-

tion

should

be

made

and

work

done

when

required

.

2

.

Primary

Contacts

(

3

and

10

Figure

23

)

.

stationary

contact

fingers

and

mov

-

able

contact

blocks

.

Badly

pitted

or

burned

contacts

should

be

replaced

.

(

Note

:

Burned

primary

contacts

in

-

dicate

the

probable

need

for

arcing

The

buffer

blocks

and

their

5

.

The

contacts

of

the

control

relay

(

17

)

Figure

6

,

should

be

inspected

for

wear

and

cleaned

if

necessary

.

6

.

Lubricate

the

breaker

operating

mech

-

anism

in

accordance

with

instructions

under

LUBRICATION

,

page

18

and

the

lubrication

chart

Figure

17

.

7

.

Inspect

all

wiring

for

tightness

of

connections

and

possible

damage

of

insulation

.

8

.

After

the

breaker

has

been

serviced

,

it

should

be

operated

manually

to

be

sure

there

is

no

binding

or

friction

and

that

the

breaker

contacts

can

move

to

the

fully

opened

and

fully

closed

positions

.

Its

electrical

oper

-

ation

should

then

be

checked

using

either

the

test

cabinet

or

the

test

couplers

.

C

.

After

Every

5000

Operations

:

In

addition

to

the

servicing

done

each

2000

operations

,

the

interrupters

should

be

removed

from

the

breaker

and

disassembled

to

permit

a

detailed

inspection

of

insulation

,

blow

-

out

coils

,

Inspect

the

condition

of

the

1

.

19

Courtesy of NationalSwitchgear.com

i

:

.

"

•

:

VVv

.

-

GEK

-

7345

Magne

-

Blast

Circuit

Breaker

of

an

arc

and

may

be

disregarded

unless

they

are

long

and

present

a

possibility

of

fin

sections

breaking

completely

off

.

Small

broken

corners

on

the

exhaust

end

of

the

arc

chute

will

not

interfere

with

its

performance

and

can

also

be

disregarded

.

The

cup

bearing

and

the

contact

ring

at

the

hinge

point

of

the

contact

blade

should

be

disassembled

,

inspected

,

cleaned

,

and

relubricated

with

G

-

E

contact

lubricant

D

50

H

47

.

The

contact

ring

should

be

inspected

for

wear

and

replaced

when

reduced

in

thickness

to

less

than

1

/

32

"

.

When

reassembling

the

cup

bearing

,

be

sure

the

cotter

is

properly

assembled

in

the

castle

nut

on

the

hinge

(

7

)

Figure

23

.

This

assures

proper

contact

pressure

at

the

hinge

.

D

.

Every

10

,

000

operations

or

Approximately

Every

Five

Years

-

Whichever

comes

first

:

The

breaker

should

be

given

a

general

inspection

and

overhaul

as

required

.

All

excessively

worn

parts

in

both

the

mechanism

and

breaker

should

be

replaced

.

Such

wear

will

usually

be

indicated

when

the

breaker

cannot

be

adjusted

to

indicate

tolerances

.

This

overhaul

and

inspection

is

more

de

-

tailed

and

will

require

disassembly

of

arc

runners

and

assemblies

which

can

become

contaminated

by

arc

products

.

The

blow

-

out

coils

should

be

carefully

examined

and

if

the

insulation

has

been

cracked

,

shrunk

or

eroded

from

arc

action

and

heat

so

that

the

turns

of

the

coils

are

not

fully

insulated

from

each

other

,

the

coils

should

be

re

-

placed

.

All

connections

should

be

checked

for

tightness

.

The

arc

runners

should

be

inspected

and

replaced

when

the

arc

resistant

coating

on

the

runner

surface

has

been

penetrated

as

a

result

of

arc

erosion

.

Check

the

stationary

arc

contacts

to

assure

that

the

arcing

contacts

are

in

good

condition

and

that

their

con

-

nections

are

tight

.

Insulating

material

that

is

carbonized

and

cannot

be

satisfactorily

cleaned

should

be

replaced

.

Any

parts

damaged

or

severely

burned

and

/

or

eroded

from

arc

action

should

be

replaced

.

NOTE

:

Fine

cracks

may

develop

in

the

fins

of

the

arc

chute

sides

,

This

is

to

be

expected

with

ceramic

mate

-

rials

when

subjected

to

the

high

heat

!

2

.

7

.

3

.

4

.

5

.

1

.

6

.

i

—

12

13

14

:

1

.

Assembly

Bolts

2

.

Assembly

Bolt

3

.

Upper

Brace

4

.

Muffler

Assembly

5

.

Upper

Pole

Pieces

6

.

Assembly

Bolts

Side

Brace

Lower

Pole

Pieces

Assembly

Bolt

Lower

Brace

Assembly

Bolts

Upper

Support

Assembly

Bolt

Upper

Interrupter

Support

Assembly

Bolts

Upper

Insulation

Assembly

Bolts

Side

Shield

Assembly

Bolts

Lower

Interrupter

Support

Assembly

Bolts

Assembly

Bolt

I

15

y

16

17

§

j

li

if

i

20

1

21

,

i

22

;

if

5.1

Figure

18

.

(

8041149

)

interrupter

Assembly

j

20

.

...

II

Courtesy of NationalSwitchgear.com

GE GEK-7345 User manual

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