84
DMX
3
17.1 Shunt trip (ST)
Shunt trip allows to open the breaker with an electri-
cal 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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