Westinghouse DBN-1016 User manual

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NAVSHIPS 362-2189
SWITCHBOARD
Technical Manual
PART Z CHAPTER 3B
NAVY TYPE ACB-1600HR
CIRCUIT BREAKER
WESTINGHOUSE TYPE DBN-1016
BEMOVABLE ASSEMBLY
1600-AMPEBE FBAME SIZE
STANDABDIZED DIMENSIONS
WESTINGHOUSE ELECTRIC CORPORATION
EAST PITTSBURGH, PA., U. S. A.
TECHNICAL MANUAL 32-855-3Cl
BUREAU OF SHIPS • NAVY DEPARTMENT • FEBRUARY, 1960

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PREliMINARY DATA
PRELIMINARY DATA
PURPOSE
A circuit breaker has two fundamental pur-
poses: First, to perform normal switching op-
erations to isolate a circuit, and second, to
isolate a circuit under fault conditions.
CAUTION -WARNING -THE CIRCUIT BREAKER
SHOULD BE IN THE OPEN POSITION AND THE
SWITCHBOARD DE-ENERGIZED BEFORE IN-
STALLING, ADJUSTING, INSPECTING. REPLAC-
ING PARTS, OR REMOVING THE CIRCUIT
BREAKER. IF THE BUS CANNOT BE DE-EN-
ERGIZED, USE INSULATED HANDLE TOOLS,
RUBBER GLOVES, AND A RUBBER FLOOR
MAT.
INSTALLATION
Tbe movable component must be removed
before stationary component can be bolted in
switchboard. Normal care in handling the sta-
tionary component is suffiCient.
After
securing the stationary component the
movable component
should be lifted by hooks in
the "lifting holes".
When installing the circuit breaker, care
should be taken to see tbat the supporting sur-
face is even and vertical, and that all leads to
be connected to the circuit breaker are de-en-
ergized. Protect the circuit breaker from dirt
and possible damage.
The connections to the circuit breaker studs
should be cleaned, flat and free of burrs to as-
sure full contact area, and firmly clamped or
bolted in place to prevent excessive heating.
The connecting
cables should bave adequate cur-
rent carrying capacity. Connecting cables should
be
supported so tbat the Circuit breaker studs
Will not be subjected to unnecessary strain.
At no time should the circuit breaker be
allowed to
rest upon or be supported by the
current studs. This Will result in unnecessary
damage and stress to the studs and the insu-
lated moldings.
Any
discoloration or pitting of the circuit
breaker contacts in evidence when the circuit
breaker is received from the manufacturer is
caused by calibrating the breaker and will in
no way interfere with proper functioning of the
circuit breaker.
MAINTENANCE
Periodic inspection of the breaker is rec-
ommended. An inspection should always be
made
after it is known tbat the breaker bas
opened on a severe short cirCuit. When a cir-
cuit breaker is not operated for long periods
of time, a high resistance oxide or suifide may
form on the contact surfaces which results in
overheating. To burn off this high resistance
film, operate the circuit breaker several times
under normal load at regular inspection periods.
Be sure the breaker is disconnected from
all sources of power before inspecting or re-
pairing.
If excessive heating occurs, look for loose
or corroded contacts or connections.
When inspecting the
breaker, examine the
contacts to see if there bas been any severe
pittings or burning of the contact surfaces which
will
prevent proper contact Wipe. Rough or
high spots should be removed with a very fine,
clean file or fine, clean sandpaper.
LUBRICATION
In general, the breaker mechanism re-
quires very little lubrication which should be
applied
sparingly. Any excessive amount of oil
on the breaker parts is apt to collect dust and
dirt and is to be avoided.
The
lubrication applied during manufacture
should
be sufficient for the life of the breaker.
REPLACNG PARTS
Before replacing any part, the operator
shouid note the position of each part before
remOVing.
When remOving or replacing tension springs
with hooks, the
work may be facilitated by pull-
ing On the hooks with a cord or a wire.
iii

CIRCUIT BREAKER
IV
TABLE OF CONTENTS
Description
CHAPTER 1 - GENERAL INFORMATION.
SECTION 0 - GENERAL DATA .....
CmCUIT BREAKER CHARACTEIDSTICS •
Rating of Components. .
Auxiliary Switch. • . . •
SECTION 1 - INTRODUCTION.
GENERAL .•.•......
SECTION 2 - DETAILED DESCIDPTlON .
CIRCUIT
BREAKER ..•
General ...•....
Movable Component .
Pole Unit .•...•
Arc Chute ..••..
Operating Mechanism .
Closing Relay . . . . .
Closing Solenoid. . . •
Shunt
Trip Device. . .
Anti-SOOck-Close Device .
Anti-SOOck-Open Device •.
Series Overcurrent Trip Unit
Auxiliary Switch. . . •
Main Disconnects . . .
Secondary Disconnects
Indicator Lights .
Silicon Rectifier.
Cell Interlock ..•..
Extension Rails . . . .
CHAPTER 2 - PmNCIPLES OF OPERATION.
SECTION 1 - GENERAL PmNCIPLES •
GENERAL ...
Description .. . . .
Closing ......•.
Tripping ...... .
Electrical Operation
CHAPTER 3 - OPERATING INSTRUCTIONS.
SECTION 1 - PRECAUTIONS .
SAFETY PRECAUTIONS ..
, .
Page
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-5
1-5
1-5
1-5
1-5
1-7
1-7
1-8
1-9
1-13
1-13
1-14
1-17
1-18
1-18
1-20
1-20
1-21
1-21
1-21
2-1
2-1
2-1
2-1
2-1
2-3
2-3
3-1
3-1
3-1
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TABLE OF CONTENTS
TABLE OF CONTENTS (Cont'd)
Description
CHAPTER 4-INSTALLATION.
SECTION 1 - INSTALLATION INSTRUCTIONS
GENERAL .•...•..•
CHAPTER 5 - MAINTENANCE .
SECTION 1 - PREVENTIVE MAINTENANCE
PERIODIC PROCEDURES ........ .
General .....•..........•
SECTION 2 - CORRECTIVE MAINTENANCE
GENERAL INSTRUCTIONS.
General ..
Chassis ....... .
Pole Units ...... .
Arc Chute ...... .
Operating Mechanism .
Closing Relay . . . . . . .
Closing Solenoid. . . . . .
Shunt Trip Device. . . . .
Anti-Shock-Clcrse Device •
Anti-Shock-Open Device •
Overcurrent Trip Device.
Auxiliary Switch. •
Main Disconnects .
Secondary Contacts
Indicator Lights . .
Silicon Rectifier ..
Drawout Interlock ..
Extension Rails . . .
CHAPTER 6 - REPAIR PARTS LIST .
SECTION 1 - REPAIR PARTS LIST INTRODUCTION.
PARTS IDENTIFICATION.
Circuit Breaker • . . . . . . . . . . . .
Repair Part Ordering. • • . . . . • . .
SECTION 2 - REPAIR PARTS TABULATION
REPAIR PARTS TABULATION .
Repair Parts . .
CHAPTER 7 - DRAWINGS .
SECTION 1 - GENERAL.
Page
4-1
4-1
4-1
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-2
5-2
5-3
5-3
5-4
5-4
5-4
5-5
5-5
5-5
5-5
5-5
5-6
5-6
5-6
6-1
6-1
6-1
6-1
6-1
6-1
6-1
6-1
7-1
7-1
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CIRCUIT BREAKER
VI
Figure
LIST OF ILLUSTRATIONS
CHAPTER 1 - GENERAL lNFORMATION
SECTION 1 - lNTRODUCTION
1-1-1 Removable ABsembly and Stationary Component. .
1-1- 2 Movable Component. . • . . . . . . . . . . . . . . .
1-2-1
1-2-2
1-2-3
1-2-4
1-2-5
1-2-6
1-2-7
1-2-8
1-2-9
1-2-10
1-2-11
1-2-12
1-2-13
1-2-14
SECTION 2 - DETAILED DESCRIPTION
Circuit Breaker Movable Component ...•.
Arc Chute and Pole Unit Assembly ....•.
Operating Mechanism with Position Indicator
Closing Relay. . . . . . . . . . . . . . . . •
Closing Solenoid and Relay Trip Assembly
Shunt Trip Device . . • • . . . .
Anti-Shock-Close Device ..... .
Anti-Shock-Open Device ... .
Typical Time Current Curves. .
Overcurrent Trip Device .•..
Auxiliary Switch . . . . • . . . •
Main and Secondary Disconnects
Indicator Light . . . . . . • • . . .
Silicon Rectifier ......•...
CHAPTER 2 - PRlNCIPLES OF OPERATION
SECTION 1 - GENERAL PRlNCIPLES
2-1-1 Wiring Diagram ................•
2-1-2 Schematic Symbols •.........•••••
CHAPTER 5 - MAlNTENANCE
SECTION 2 - CORRECTIVE MAlNTENANCE
5-2-1 Relay Contact Adjustment . . . • • • . . . .
CHAPTER 7 - DRAWlNGS
SECTION 1 - GENERAL
7 -1-1 Air Circuit Breaker Removable Assembly.
7-1-2 Air Circuit Breaker Stationary Components.
Page
1-3
1-4
1-5
1-6
1-8
1-10
1-11
1-12
1-13
1-14
1-15
1-16
1-19
1-20
1-21
1-21
2-2
2-3
. . .. 5-4
. 7-3,7-4
. 7-5,7-6
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Table
LIST OF TABLES
CHAPTER 1 - GENERAL INFORMATION
SECTION 0 -GENERAL DATA
1-0-1 Circuit Breaker Classification Data
1-0-2 Current Rating of Components
1-0-3 Voltage Rating of Components
1-0 -4 Auxiliary Switch . . . . .
LIST OF TABLES
Page
1-1
1-1
1-2
1-2
vii

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CHAPTER l-GENERAL INFORMATION
CHAPTER 1
GENERAL
INFORMATION
Section O-General Data
1-0-1 CIRCUIT BREAKER CHARACTERISTICS 1-0-1-1 Rating of Components
The circuit breaker classification data is The rating of the components are listed in
listed in Table 1-0-1. Tables 1-0-2 and 1-0-3.
TABLE 1-0-1-CIRCUIT BREAKER CLASSIFICATION DATA
Type ...
Frame Size (continuous rating).
Voltage ..
Current ..... .
Frequency .... .
Poles ....... . . .
Continuous Current Rating
Interrupting Capacity
Short Time Rating .
Short Time Duration
Means of Closing
Auxiliary Switch.
(Trip Coil)
Mounting .....
Connections . . .
Insulation Class .
Shock Classification.
Ambient Temperature.
Protective Functions
Master Drawing .•.........
Navy Test Approval. . . . . . . ..
Weights -
Complete Removable Assembly.
Movable Component Only .
Stationary Component Only
Overcurrent Device ....
· .. Navy Type ACB 1600HR
(W.E. Corp. Type DBN1016)
1600
Amperes
. 500 Volts
· ............. A-C
· . . . • • . .
... 60 Cycles
• • . . • • . • . . . • • •• 3
.800,1000,1200,1400,1600 Amperes
· ..... 100,000 (RMS) Amperes
· ..... 100,000 (RMS) Amperes
· ..•.......... 30 Cycles
Electrical and Emergency Manual
.................. 8
· Removable Assembly -Dead
Front
.. Back
.. ... B
· . . . . . . . Class III
· . . . . . . .
.. 50
0C
·
Overcurrent, Long Delay Tripping,
Short Delay Tripping (Bands 1,2&3),
Instantaneous Tripping, Shunt Trip
Westinghouse il900J232 (2 sheets)
5419-31 of 20 March 1959
· 560 Ibs.
· 440 Ibs.
· 120 Ibs.
· 10 Ibs.
TABLE 1-0-2-CURRENT RATING OF COMPONENTS
Duty
Load Duration
Allowable Operations
Components
(Amperes)
(Seconds)
Per Minute
115V.
Closing Relay
4 Intermittent
1/5
10
450V.
Closing Relay 1 Intermittent
1/5 10
115V. Closing Magnet
80 Intermittent
1/10 10
450V. Closing Magnet
20 Intermittent
1/10
10
115V. Shunt Trip
4 Intermittent
1/10 10
450V. Shunt
Trip
1 Intermittent
1/10 10
Auxiliary Switch
15 Intermittent
(For interrupting rating see table)
Secondary DIsconnects
15 Intermittent
(No interrupting rating)
Wiring to Aux. Switch
10 Intermittent
(Unless contract specifies more)
1·1

CIRCUIT BREAKER
TABLE 1-0-3-VOLTAGE RATING
OF COMPONENTS
Nominal Voltage
Rating Range
Components (Volts)
Volts
Closing Re lay 115 90-130
and Magnet 450 360-500
Shunt
Trip
115
80-130
450 360-500
1-0-1-2 Auxiliary Switch
The interrupting capacities of the auxiliary
switch contacts are listed in Table 1-0-4.
TABLE 1-0-4-AUXILIARY SWITCH
Non-Inductive Inductive
Volts Circuit
Circuit
115 a-c 75 amps. 15.0 amps.
450 a-c 25
amps.
5.0 amps.
Section l-Introduction
1.1·1 GENERAL
This technical manual describes a Navy
Type ACB 1600HR (Westinghouse
Type DBN-
1016) 1600-ampere frame size air circuit
breaker, meeting the requirements of Specifica-
tion MlL-C-17587 for Naval Shipboard service.
Each circuit breaker is supplied as a complete,
removable switchboard assembly consisting of
circuit breaker, separable
disconnects and as-
sociated control wiring, drawout mechanism and
assemhly structual supports and back plate in·
cluding stationary main bus connections and sta-
tionary terminals for connection of the necessary
external control wiring.
The complete, removable assembly consists
of two major components; the stationary com-
ponent that is bolted into the switchboard frame,
and the movable component which is the oper-
ating mechanism of the circuit breaker and may
be drawn out for inspection, maintenance or
isolation from the shipboard electrical system.
The general arrangement of this equipment
is shown in figures 1-1-1 and 1-1-2.
The DBN-1016 air circuit breaker is a
complete, removable assembly for installation
within a switchboard cubicle.
The circuit breaker is designed as an as-
sembly including the drawout mechanism. These
assemblies incorporate disconnect features for
both main current connections and secondary
current connections.
This mounting allows easy
'·2
removal and installation of the movable compo-
nent when maintenance operations are required.
The circuit breaker is closed electrically
from a local or remote control switch. It may
be tripped from the control switch or may be
tripped by depressing the "Push-To-Trip" button
which
protrudes through the face plate.
For maintenance, the emergency closing
handle provides manual closing by inserting the
operating handle, through the face plate, into
the
socket provided in the operating mechanism
and pulling the operating handle down (approxi-
mately 45 degrees) until the breaker latches.
The moving component consists of a rigid
steel chassis to which are bolted various sub-
assemblies. Each sub-assembly is a complete
unit and is readily interchangeable between
breakers. In addition, each sub-assembly may
be removed intact and easily replaced for mini-
mum outage time.
·The sub-assemblies requiredin all breakers
are the mechanism, pole units, arc chutes, aux-
iliary switch, secondary disconnects, anti-shock-
closed-device, anti-shock-open-device, closing
relay, and closing magnet. The remaining sub-
assemblies that may be included are overcurrent
trip devices and shunt trip device.
The air circuit breaker for three phase a-c
service is normally provided with overcurrent
trip devices in the two outer poles, otherwise
the three poles are identical.
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AUXILIARY
l
CHAPTER I-GENERAL INFORMATION
RECTIFIER
MAIN
STATIONARY
I
' .... T" .... " BOLTS
INDICATOR
LIGHT
EXTENSION
RAILS
,
,
> < ~
STATIONARY
COMPONENT
OPERATING
HANDLE
FIC U RE }./.1- Removable A..,embly and Stationary Component
CROSSBAR
,
1·3

CIRCUIT BREAKER
1·4
ARC CHUTE
FACE
PLATE
MAIN
SECONDARY
DISC ON N ECTS
ANTI-SHOCK-OUT
OPERATING MECHANISM
EXTENSION RAIL
RELEASE
HOLE
CAM ROLLER
ROLL OUT WHEELS
F,GURE: 1-1-2 - Movable Component

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CHAPTER l-GENERAL INFORMATION
Section 2-Detailed Description
1-2-1 CIRCUIT BREAKER
1-2-1-1 GOtneral
Paragraph 1-1-1 describes the general de-
tails and subsequent paragraphs describe vari-
ous sub -asse mblies in detail.
1-2-1-2 Movable Component-(S .. Figure 1-2-1)
This assembly consists of a rigid steel
panel (149), two supporting frames (186), aI)d
shelf (141). The supporting frames are bolted
to the front of the steel panel and support the
shelf. Move out rollers and the lever roller
are attached to the side of each of the support-
ing frame s. A lifting hole has been drilled in
+ of-
+
.,
D
0
183
CD
0
0
c----
r:, 0
+ +
+
190 191
each of the supporting frames to assist in
raising the movable component when drawn out
of the stationary component.
1-2-1-3 Pol. Unit-(s.. Figure 1-2-2)
Three separate pole units are bolted to the
front
of the steel panel, one for each of the
three phases. Each pole unit consists of a base,
a stationary contact assembly and a moving
contact
assembly. The base is molded from
Navy Type MAI-60 insulating material and iso-
lates the stationary and moving contacts from
the chassis.
The stationary contact assembly consists
of the main stationary contact receptacle (138),
188
189
150
187 194 186
r;';;'
i;;'·,
IIIL_.r--432
425
149
LEGEND
141
142
143
144
145
146
'147
148
SHELF
149
TRIP BAR BEARING PLATE
150
LEVER UNIT
174
LEVER HANDLE
183
STOP PIN
186
PIN
187
SPRING
188
TRIP BAR
189
PANEL
OPERATING MECHANISM
OPERATING HANDLE
TRIP BUTTON
SUPPORTING FRAME
CROSS BAR
LOCKNUT
TIE STUD
* REPAIR PARTS
190 FACE PLATE
191 SCREW
192 ROLLER
193 ROLLOUT WHEEL
194 PIN
425 MAIN DISCONNECT
432 SECONDARY DISCONNECT
440 INDICATING LIGHT
FIGURE 1-2-1- Circuit Brealcer Movable Component
1·5

CIRCUIT BREAKER
100
101
102
103
'104
105
106
107
108
109
110
111
112
" 113
114
... 115
116
117
118
119
* 120
j~ r,
t~ Lrj
~~::=--=---.:-:'-=-: .-:.::" -::.t,i
h: ~~ "~ I
I:@ Ii
1-11
6
IlL 0 'I'
',I \ I
:~ --- --/---''\-----1::
W}/\jU
~-'.0"-~' '
" '~~'
8il /(
, ,'
~Ir-"_,._.
-r ~,/: :~~~r I
if' . 'd
: i I ~ I
~ hr<:
142 -
I-
~
'j
°1
\_/
1
,
Ir
i<
IX
t·"',
' ..... j
POLE UNIT
BASE
LOWER STUD
SPRING SEAT
,
·mU¥~
,,,\
'...-~'
MAIN CONTACT SPRING
PRESSURE PLATE
BOLT
PRESSURE PIN
UPPER STUD
LOCK PlATE
BOLT
PIVOT PIN
SHUNT
SPRI NG, ARCI NG CO NT ACT
BOLT
~
~
115
141
118
119
STATIONARY ARCING CONTACT -CENTER
ARC CHUTE
PLATE
TUBE SPACER
SCREW
MOVING ARCING CONTACT
'REPAIR PARTS
121
122
123
124
125
126
127
*128
129
130
131
" 132
133
134
135
136
137
138
139
140
" 141
" 142
LOCK CLIP
BOLT
MOVING CONTACT ARM
MAIN MOVING CONTACT
LOCK PlATE
TURNBUCKLE
INSULATING LINK
SPRING, ACCELERATING
AUXILIARY CONTACT
HINGE
PIN
SPRING, AUXILIARY CONTACT
NUT
SCREW
MAIN CONTACT FINGER
PRESSURE PIN
MAIN CONTACT FINGER
MAIN STATIONARY CONTACT RECEPTACLE
HINGE
PIN
STATIONARY ARCING CONTACT - RH
STATIONARY ARCING CONTACT - L H
FIGURE 1-2-2 - Arc Chute and Pole Unit A .. embly
1-6
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the upper stud (lOS), the main contact fingers
(135) and (137), pins (107) and (136), pressure
plate (105), main contact spring (104), arcing
contact (115), the arcing contact spring (113),
pin (Ill) and shunt (112). The main stationary
contact is bolted to the base (101) and the arc-
ing contact is pivoted on pin (111). The main
and arcing contacts are connected electrically
by shunt (112).
. The
main stationary contact fingers (135)
and (137) are ball ends which pivot in sockets.
Main contact pressure is equalized by the main
contact spring (104) through pressure plate (105)
and pressure pins (107) and (136).
Limited rotation about pin (111) provides
for arcing contact overtravel while the arcing
contact spring (113) maintains the required con-
tact pressure. The overtravel feature permits
the arcing contact to close first and remain
closed until after the main contacts have sep-
arated. 'The contact surfaces of the arcing
contacts are special arc resistant alloy inserts.
The moving contact assembly consists of a
contact arm (123) of copper to which is fastened
arcing contact (120) by two bolts (122) which
are locked by lockclip (121). The main contacts
are an integral part of the moving contact arm
(123) and the contact tips are silver brazed in
position. The auxiliary contacts (129) carry the
current from the moving contact assembly to
the lower stud. Spring (132) provides the re-
quired contact finger pressure between the mov-
ing contact assembly and the lower stud.
1-2-1-4 Arc Chute-(See Figure 1-2-2)
The arc chute (116) mounted above and
surrounding the contact assembly of each pole,
stretches and cools the arc drawn between the
separating contacts so that the arc may be ex-
tinguished and the Circuit opened in the least
possible time. The arc chutes are an extremely
important part of the circuit breaker and a
breaker should never be energized without their
be ing mounted in place.
Each arc chute consists of a number of
metal plates and asbestos plates (117) supported
in a laminated case and held in place by a
clamping plate, insulating tube spacers (lIS) and
two screws (119) through the insulating spacers
to the molded base (101). When the arc is
drawn by the separating contacts, it moves up
into the chute by magnetic and the rmal action
where it is quickly de-ionized and extinguished.
CHAPTER l-GENERAl INFORMATION
1-2-1-5 Operating Mechanilm-(S .. Figure 1-2-3)
The operating mechanism opens and closes
the circuit breaker by moving the cross bar
(lS7) (Figure 1-2-1) to which the moving con-
tact assemblies are attached. It is mounted
on the
top of the shell at the center of the cir-
cuit breaker.
The operating mechanism consists of a
group of toggle
links and a latch attached to the
operating mechanism frame on fixed pins (154),
(157), (171), (173), (179)
and (lS2). The cross
bar is held by the closing lever (158). De-
pressing the operating handle moves the oper-
ating mechanism from the open to the closed
position. This is accomplished when the end
of the handle socket (175) forces the first toggle
link (172)
upward, pushing the second toggle
link (165), the
third toggle link (163) and the
closing lever (15S) ahead of it. The motion of
the toggle
linkages is directed by link (160)
which
is pivoted at its lower end on pin (155),
in
latch (156). Latch (156) in turn is restrained
from moving by roller latch (159) which is
pivoted on pin (179) and engages trigger (ISO)
on the trip lever. The linkage is held in the
closed position by pawl (164).
In
electrical operation, plunger rod of the
closing solenoid bears directly on pin (177) thus
engaging linkage and closing breaker.
The mechanism is opened by rotation of
the
trip bar (151) counterclockwise. This is
accomplished either by pushing the "Push To
Trip" button, in which case the pushbutton ro-
tates latch (153), or by causing the tripping at-
tachment to strike trip finger (152). In either
case, the counterclockwise rotation of the trip
lever moves trigger (ISO) out of engagement
with the lower end of the roller latch (159),
which in
turn permits the roller latch to rotate
counterclockwise out of engagement with latch
(156). Latch (156) is then free to rotate in
response to the pull of the link (160) so that
the mechanism assumes the trip free position
shown in
Figure 1-2-3 in which the contacts are
open, but part of the mechanism levers are in
the closed position. In this position pawl (164)
is disengaged permitting the linkage to collapse
to the open position.
Position indicator (170) is an integral part
of the mechanism, formed from sheet metal and
pivoted on pin (l7l). It is visible from the
front of the circuit breaker through a window
in
the faceplate and mechanism frame. With
the
circuit breaker in the open position shown
1-7

CIRCUIT BREAKER
in Figure 1-2-3, the yellow face of the indi-
cator shOws through the window. The word
"Open" is stamped on this yellow face. When
the
breaker closes, pin (161) of the closing
lever (158) pulls indicator link (166) to the
right, thus rotating the other face of the indi-
cator up into position visible through the win-
dow. This face is painted b~U':J;::d is stamped
with the word "Closed". The" sition indicator
151
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
*167
@
PU,",
TO lRIP
I
183~=i=dI
184
OPERATING MECHANISM
TRIP BAR
TRIP FINGER
LATCH
PIN
PIN
LATCH
PIN
CLOSING LEVER
ROLLER LATCH
LINK
PIN
PIN
THIRD TOGGLE LINK
PAWL
SECOND TOGGLE LINK
INDICATOR LINK
SPRING PAWL
150
*REPAIR PARTS
provides a positive visual indication of the op-
erating condition of the circuit breaker.
1-2_1-6 Closing Rolay-(See Figure 1-2-4)
The closing relay is used on electrically
operated breaker only and is mounted on the
left side of the
closing solenoid. This relay
closes and opens the closing coil circuit of the
168
169
170
171
172
173
174
175
*176
177
178
179
180
* 181
182
183
184
* 185
COVER
FRAME
POSITION INDICATOR
PIN
FIRST TOGGLE LINK
PIN
OPERATING HANDLE (EMERGENCY)
HANDLE SOCKET (EMERGENCY)
SPRING, TRIP BUTTON
PIN
COTTER PIN
PIN
TRIGGER
SPRING, LATCH.
PIN
TRIP BUTTON
SCREW
SPRING, TRIP BAR
FIGURE 1-2-3- Operating Mechaniam with POllition Indicator
1·8
r
(
/

(
(
solenoid, in electrical operation. The relay
provides a means of closing the Circuit breaker
electrically from a remote point through a con-
trol switch.
The
relay base (238) is molded from insu-
lating material. The contact assemblies, coil
assembly and other parts are attached to the
base. Frame (203) holds the coil in place and
serves as part of the magnetic circuit of coil
(206). The frame or yoke is secured to the
molded
base by three screws (208). The coil
(206) is held in place by guide tube (207). The
relay is enclosed by molded cover (211) which
is secured by screw (239).
The moving
core (204) is free to slide up
and down in the guide tube (207). In moving up
in
response to the magnetic pull from the sta-
tionary core when the coil is energized, the
moving
core pulls up latch (229) which is fas-
tened with pin· (227) to the mOving core. When
the coil (206)
is energized, spring (225) bearing
against latch (229) holds the latch in such a
a poSition that
it is hooked under latch pin (230),
causing moving contact arm assembly to rotate
counterclockwise around contact arm pin (232),
thereby compressing spring (235). The moving
contacts (236) are thus pulled against the sta-
tionary contacts (237) completing the circuit.
As the pin (230) is moved upward toggle
links (228) and (224) are raised. Toggle link
(228) pivots on
pin (223) and toggle link (224)
is attached to the moving contact arm (234)
which pivots on
pin (231). As the toggle links
move upward, the
contact arm is rotated coun-
terclockwise and the relay contacts are closed.
When the
relay contacts close, current starts
flowing through the coil (250) (Figure 1-2-5) of
the closing
solenoid. The moving core (245)
of the solenoid
moves up closing the circuit
breaker. Trip bracket (257) fastened to the
moving
core of the solenoid forces the first
trip lever (225) of the relay trip assembly up;
increased spring tension rotates second trip
lever (253) which strikes the relay trip pin
(201) (Figure 1-2-4) forcing it upward. The
trip pin rotates the trip crank (220) which en-
gages the latch (229) and rotates it clockwise
against the torque exerted by torsion spring
(225). The rotation of latch (229) disengages
latch pin (230), the toggle links (224) and (228)
collapse and
spring (235) rotates the mOving
contact arm (234) clockwise to snap the mOving
contacts (236) away from the stationary con-
tacts (237).
The main moving
contacts (236) are fas-
tened to the contact arm (234) which is molded
CHAPTER l-GENERAL INFORMATION
from insulating material. Silver alloy contact
tips are brazed on the contact legs.
The main stationary contacts are made
from spring material and are
"u" shaped. They
are secured to the base by screws (240). The
"U" shape arrangement causes a slight rolling
and wiping action on the spherically shaped con-
tact surfaces, as they meet, which helps to in-
sure a positive electrical connection.
With the Circuit breaker in the closed po-
sition, the trip pin (201) of the relay is held in
the
trip position. Therefore, even though the
relay coil may be inadvertently energized when
the circuit breaker is latched, the relay con-
tacts will not close and no current can flow
through the
circuit breaker closing coil.
With the Circuit
breaker in the closed po-
sition, if the control switch is held closed, the
moving
core (204) will remain up with normal
or low control voltage. If breaker is tripped
open, relay latch (229) cannot engage latch pin
(230) until control switch is opened. Thus
breaker is "Anti-Pump" under low voltage con-
ditions and will not reclose until control switch
is opened and closed again.
Two blowout coils (216) and (217) and two
arc chambers are provided so that the arc
drawn by the separating contacts may be ex-
tinguished and the Circuit opened in the least
possible time. The blowout coils are held in
place by two
iron plates and secured by screws
(218). The blowout magnet coil is connected in
series with the contacts, which causes flux to
flow through the magnetic circuit and the air
gap of the blowout magnet assembly. The mag-
netic circuit is positioned so its air gap is
across the arc chamber and the arc. At the
time the contacts part and draw an arc, the arc
is deflected by the magnetic force down into
the
arc chamber where it is extinguished due
to the
stretching and cooling process. This
arrangement makes possible a small and effi-
Cient relay.
The relay is provided with a "seal-in" fea-
ture through the auxiliary contact (244) which
can be connected in
parallel with the control
switch in the
relay coil circuit. If this connec-
tion is made, once energized the relay will re-
main closed until breaker closing solenoid com-
pletes its stroke.
1-2-1-7 Closing Solonoid-(Soe Figure 1-2-5)
The closing solenoid is designed to operate
on
direct current of rectifier (See Paragraph
1 - 2 - 1 - 1 6) and is used to close the circuit
1·9

,
CIRCUIT BREAKER
1·10
232
235
236
2'1l
241
239
242
212
210
226 203
(
204
~-203
SECTION AA 201
200
FIGURE 1-2-4- Clo.in, Relay

(
(
CHAPTER l-GEMERAL INFORMATION
L_
200 Closing Relay
201 Trip Pin
202 Pin
203 Coil Frame
204 Movable Core
205 Stationary Core
*206 Control Coil
207 Bushing
208 Mounting Screw
209 Bushing Screw
210 Contact, Auxiliary
211 Cover
212 Side Plate
213 Screw
214 Arcing Chanber Retain.ng Strip
215 Arcing Chamber
*216 Blowout Coil -Left Hand
*217 Blowout Coil - Right Hand
218 Side Plate Screw
219 Relay Mounting Screw
220 Trip Crank
*221 Spring, Trip
*Repair Parts
222 Trip Cronk Pin
223 Pin
224 Second Toggle Link
*225 Spring, Latch
226 Stationary Core Mounting Bolt
227 Drive Pin
228 First Toggle Link
229 Latch
230 Pin
231 Pin
232 Pin
233 Movable Contact Screw
234 Movable Contact Arm
*235 Contact Arm Spring
*236 Movable Contact
*237 Stationary Contact
238 Base
239 Cover Screw
240 Stationary Contact Screw
241 Main Circuit Terminal
242 Magneti c Core
*243 Spring, Auxi liary Contact
FIGURE 1-2-4 - Closing Relay
252
251
_ 0
:A!
,: ~'=V
t?":I ;:
\::;V ,1
,:
,. :': I ')
!--i.:.- _______ --l} -:!1:.===_-~~
1 , ,
: A: A:
, , '
, , '
:["~"'-O=~_~ j-- __ =-~--~)
1,: ,I" '10 :,"
I~ I .' ~: ;1
LEGEND
246
245
244 CLOSING SOLENOID (D-C)
245 MOVING CORE
• 250
251
252
253
COIL
FRAME
256 RELAY TRIP BRACKET
257 TRI P BRACK ET
246 BOLT
2Jfl OPERATING ROD
248 STOP
249 BOTTOM PLATE
* 254
255
STATIONARY CORE
SECOND TRIP LEVER
SPRING, RELAY TRIP
FIRST TRIP LEVER
258 BOLT
259 LOCKPLATE
201 RELAY TRIP PIN
*REPAIR PARTS
FIGURE 1-2-5 - Closing Solenoid and Relay Trip Assembly-
ElectriCGlly Closed Breakers
1-11

CIRCUIT BREAKER
breaker electrically and is mounted directly be-
low the mechanism and under the shelf (141)
(Figure 1-2-1) of the circuit breaker. It is se-
cured to the shelf by the same four bolts that
holds the mechanism in place.
The closing solenoid consists of an iron
frame or yoke (251) which is bolted to the cir-
cuit breaker shelf, a plunger or moving core,
an operating rod (247), a stationary core (252)
and a coil (250).
The operating rod (247) connects the moving
core (245) to pin (177) (Figure 1-2-3) of the
mechanism. When coil (250) is energized through
the contact of the closing coil (Refer to Para-
graph 1-2-1-6), the moving core (245) moves
upward in response to the magnetic attraction
between the stationary and moving cores across
air gap "A". About one-tenth of a second is
required for the solenoid to close and latch the
270 __ -K/I,~
circuit breaker. The moving core is provided
with a trip bracket (257) and when the moving
core moves into the "breaker closed" or "closed
gap" position, trip bracket (257) engages tbe
first trip lever (255) of the relay trip assembly.
As tbe first trip lever (255) is forced upward,
increased tension on spring (254) rotates second
trip lever (253) which engages the relay trip
pin (201) (Figure 1-2-4) of tbe closing relay to
trip the relay, the relay contacts open, de-en-
ergizing the closing solenoid. Tbe coil of the
closing solenoid is momentarily rated and seri-
ous damage will result if potential is allowed
to remain on its terminals through improper
adjustment of the relay trip pin (201) so that the
relay does not trip and interrupt tbe closing
coil circuit (Refer to Paragraph 1-2-1-6). When
the moving
core and operating arm have pushed
the mechanism linkage to the closed and latched
position, pin (177) (Figure 1-2-3) of the oper-
ating mechanism holds the moving core in the
264
260
LEGEND
266
,
-'-----
260 SHUNT TRIP DEVICE *251
* 268
269
270
271
272
SLEEVE
SPRING
COIL
FRAME
261 SCREW
262 PLATE
263 PIN
264 TRIP BAR
265 MOVING CORE
*REPAIR PARTS
FICURE 1-2-6- Shunt Trip Device
1-12
NON-MAGNETlC WASHER
STATIONARY CORE
BOLT
(

(
(
"closed gap" position. When the mechanism
(150) is tripped, pin (177) falls, allowing the
operating arm and the moving core to fall to
the "open gap" position.
1-2-1-8 Shunt Trip Devica-(See Figure 1-2-6)
The shunt trip device is used on electrically
operated breakers and is mounted on the breaker
shelf.
The shunt trip device consists of a frame
(269), stationary core (271), moving core (265)
and the trip coil (268). Energizing the trip coil
(268) sets up a magnetic attraction between
stationary core (271) and moving core (265).
The moving core moves to the left which ro-
tates trip bar (264) to trip the circuit breaker.
The opening of the circuit breaker de-energizes
281
280
LEGEND
CHAPTER l-GENERAL INFORMATION
the shunt trip coil through a normally open
auxiliary switch contact. Spring (267) then re-
turns the moving core (265) to its normal po-
sition. Non-magnetic washer (270) prevents
residual magnetism from holding the cores to-
gether when the coil is de-energized.
1-2-1-9 Anti-Shock-Clo •• Dev;ce-(S .. Figure 1-2-7)
The anti-shock-close device (280) is
mounted on the side of the operating mecha-
nism. This device prevents the circuit breaker
contacts from closing from shock when the
breaker is in the open position. This device
also, functions as an anti-bounce latch.
The anti-shock-close latch (281) is pivoted
on the side of the mechanism. The plate is so
shaped that the impact of shock rotates the de-
280 ANTI-SHOCK-CLOSE DEVICE
281 LATCH
282 CLIP
283 PIN
284 BOLT
.285 SPRING, RETURN
286 CLOSING LEVER
287 PIN
• REPAIR PARTS
FIGURE 1-2-7 - Anti-Shock-Close Device
1·13

CIRCUIT BREAKER
vice, and the hook engages pin (287) of the op-
erating mechanism to momentarily hold the
breaker open. The anti-shock-close device also
serves as an anti-bounce latch to prevent the
closing lever (286) from bouncing off its stops
and re -closing the circuit when the circuit
breaker interrupts maximum short circuit cur-
rents. Under these conditions the crossbar
knocks the latch up, causing the latch to en-
gage the cross bar pin to momentarily hold the
breaker open. Return spring (285) returns the
latch to its original position when conditions
are normal.
1-2-1-10 Anti-Shock-Open Device-(See Figure 1-2-8)
The anti-shock-open device prevents trip-
ping of the circuit breaker due to rotation of
the
trip lever caused by shock when breaker
is in the closed position and is mounted On the
circuit breaker shelf to the right of the oper-
ating mechanism frame.
288
289
290
, 291
292
293
294
298 299 300
ANTI-SHOCK-QPEN DEVICE
ROTATING MASS
GEAR
SPRING, WEIGHT
GEAR
LEVER
FRAME
The anti-shock-open device consists Qf a
frame (294) , cover (296), weight (297), lever
(293), spring clip (298), lever spring (299),
weight
spring (291) and a gear train. The gear
train is composed of two torque reducing gears
(290) and (292) and a round unit of rotating mass
(289). Under shock conditions, the weight (297)
is rotated about pin (295). As the weight ro-
tates, it forces the lever (293) outward to block
the trip bar and prevent breaker tripping. Dur-
ing the outward movement of the lever, spring
clip (298) acts as a ratchet on gear (292) al-
lowing the lever to move without rotation of the
gear train. Weight spring (291) returns the
weight to
its original position. When lever
spring (299) starts to return the lever to the
original poSition, the spring clip (298) engages
the teeth of gear (292) causing rotation of the
gear train. The rotation of the gear train
causes a time delay in the return direction.
This time delay holds the trip bar for the du-
ration of the shock.
LEGEND
295
296
2'11
298
, 299
300
292
288
PIN
COVER
WEIGHT
SPRING CLIP
SPRING, LEVER
BOLT
291
'REPAIR PARTS
FIGURE 1.2.8 - Anti-Shock-Open Device
1-14
(