98
DMX
3
17.1. Shunt trip (ST)
Shunt trip allows to open the breaker with an
electrical signal. According to the features of the
device, it’s always possible to open the breaker
(when closed). The shunt trip can work (depending
on type) both on AC and DC current.
This device can work with an instantaneous
supply, but it works also with a continuous one.
If always supplied, the device is like an electrical
lock in open position.
Some applications need an high safety on the
open command, and , particularly, the duplication
of the command circuit by a double shunt trip. In
those cases the second shunt trip can be placed
instead of the UVR device.
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