Instruction Book
Effective: November 2017 Page 46
For more information visit:
www.Eaton.com
IB131016EN
5-6 ACCESSORY DEVICES
A variety of accessory devices are available for use
with VCP-T and VCP-TR circuit breakers. Unless
otherwise stated, they should be considered optional
devices in the sense that they are not provided as
standard on a manually operated circuit breaker.
Circuit breaker accessories are common to all
circuit breaker ratings. The accessories fall into one
of three categories:
Plug-in electrical
Internal electrical
Mechanical
5-6.1 PLUG-IN ELECTRICAL ACCESSORIES
There are three plug-in electrical accessories. All
three can be viewed for identification by name and
rating through viewing windows located in the right
front of the circuit breaker (Figure
5-21).
These
accessories can be factory installed or field installed
using a kit. A maximum of three plug-in accessories
can be mounted. Two trip devices and one close
device can be used. The three plug-in accessories
are:
Shunt Trip (ST)
Spring Release (SR)
Undervoltage Release (UVR)
Shunt Trip -
The shunt trip opens the circuit breaker
instantaneously when its coil is energized by a voltage
input (Figure
5-22
and Table
5.3).
One shunt trip is
supplied as standard with all manually operated and
electrically operated circuit breakers. An optional
second shunt trip can be supplied for customer use.
Spring Release -
The spring release remotely closes
the circuit breaker when the coil is energized by a
voltage input (Figure
5-23
and Table
5.4).
A spring
release is supplied as standard with all electrically
operated circuit breakers. In every other situation, the
spring release is an optional device.
Undervoltage Release -
The undervoltage release
opens the circuit breaker when the supply voltage
falls below 70% (Figure
5-24
and Table
5.5).
If the
release is not energized to 85% of its supply voltage,
the circuit breaker cannot be reclosed electrically or
manually. The undervoltage release device is always
optional.
Figure 5-21 Through-The-Window Electrical
Accessories
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