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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
(
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