Instruction Book
Effective: November 2017 Page 36
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IB131016EN
5-3.2 ELECTRICAL OPERATION
For electrically operated circuit breakers, the springs
are normally charged through the use of a rugged
electrical motor operator (Figure
5-7).
The springs can,
however, be manually charged as just described in the
previous section.
Like the manually operated circuit breaker discussed
in the previous section, electrically operated circuit
breakers can also be manually closed and opened
through the use of the front mounted manual "ON" and
manual "OFF" pushbuttons. A factory supplied
electrically operated circuit breaker is equipped as
standard with a spring release to close the circuit
breaker electrically and a shunt trip to trip (open) the
circuit breaker electrically. A second shunt trip or an
undervoltage release are available optional devices.
Refer to paragraph 5-5.1 for more details.
5-3.3 TRIP FREE OPERATION
When the manual trip button is held depressed, any
attempt to close the circuit breaker will be prevented.
5-3.4 ANTI-PUMP FEATURE
All circuit breakers have a standard mechanical anti-
pump feature. If the circuit breaker is open, it only
accepts one attempt to reclose when the close
command continues uninterrupted.
5-3.5 LATCH CHECK SWITCH
Any circuit breaker capable of being electrically closed
is provided with a latch check switch. The latch check
switch insures that all closing conditions are met before
the circuit breaker can be electrically closed. If a spring
release device is supplied for installation in the field, a
latch check switch must also be purchased and used.
5-3.6 MECHANICAL INTERLOCKS
The mechanical interlock function can be provided in
two ways:
(1) One is an optional fixed breaker key interlock
located on the circuit breaker's front cover (Figure
5-
8).
The key interlock can utilize Ronis, Castell or Kirk
devices. This mechanical interlock feature prevents
the circuit breaker from closing.
Figure 5-7 Motor Operator Shown Installed
(2) The other means is a family of optional mechanical
interlocks (Figure
5-9).
They are used to prevent the
closing of two or three circuit breakers. The mechanical
interlock holds one or more circuit breakers tripped
(prevents closure) when others are closed. The circuit
breakers are interconnected with cables.
Figure 5-8 Typical Cover Mounted Key Interlock
Summary of Contents for 50 VCP-TR16
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