Operation
CC . . . . . Circuit Breaker
Closing Coil
TC . . . . . C ircuit Breaker
Trip Coil
Y
.
.
.
.
.
. Aux. Closing
Relay-Anti-Pump
MCO . . . Motor Cutoff
Switch
88
. .
. .
. Spring Charging
Motor
CSC . . . Control Switch
Close Contact
CST . . . . Control Switch
Trip Contact
R . . . . . . Red Indicating
Lamp
G . . . . . Green Indicating
Lamp
- -
...-
- - - - - - - - - - - -
-
-
�
t
.
I
I
Lf:1r-- __,- - - - - - - ,
I
I
I
Fuse
:
r·,
. 1,
,
:
!
l
.
'
.
cs
-.:_•,
,
.
I
I
C
�-·
:
f;i')
-
_
CS
""""'
T
Control
Power
Supply
rc
Q
2A -
I .
2
_ _
,
.. - �
-- 7
�, ¢
a . . . . . . Aux. Switch
Open when Breaker
is Open
b
.
. . .
.
.
Aux. Switch
Closed when
Breaker is Open
MDS . . . Motor Circuit ON-O:=F Switch
CT . . . . . Tripping Transformer
STD . . . . Static Trip Device
i
�;�
Figure
3.
Typical Schematic-Electrically Operated
Breakers
Diagra'1l Shows Breaker in Discharged and Open Position
To manuaily open the circuit breaker, press in manual trip rod
(94). This bar engages the top of trip flap (1 2), to disengage
the latch
(15).
•
Electrically Operated Circuit Breaker
The mechanism of the electrically operated circuit breaker is
the same as the manuaily charged circuit breaker, except that
the manual charging handle is replaced by a motor and gear
system. Refer to
Figure 2,
and
Table 2.
Power available to
the control circuit will start the automatic charging cycle. The
motor gear box p inion rotates gear
(81)
counterclockwise.
Cam follower
(82)
engages an arm of wind and close cam
(34), which rotates the cams in the same manner as for the
manua:ly charged circuit breaker. When the wind and close
cam (34) reaches its charged position, the
back
of the cam
engages switch lever (73), rotating the lever away from the
swit:h
operator. Gear switch lever (76) will still be holding the
switch
in
the operate position and the '1lOtor will continue
to
run until
the
roi!
pins on the side
of
gear
(81 )
!:its iever (76)
8
Table 2.
Operating Procedures Electrically
O perated Circuit Breakers
Operation
Charging
Springs
Closing
Tripping
Procedure
Energize control circuit.
After springs are charged , actuate
remote close control switch (CSC).
O R
Push down firmly on spring-release
latch hood
(50).
' Actuate rer�ote tr:p control switch
(CST).
OR
Push in manual trip
rod
(94)
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