Trip Cirucit Supervision Relay

The supervision relay type TCS is intended for a continuous supervision of circuit breaker trip
circuit and to give an alarm for loss of auxiliary supply, faults on the trip-coil or its wires independent of the breaker position, faults on the breaker auxiliary contacts and faults in the
supervision relay itself.

The following diagarm explains how the trip circuit supervision relay works:

There are 3 scenarios:
1. Supervision in preclose condition.
2. Supervision in postclose condition.
3. Supervision with latched trip or protection relay.


Reference: http://www02.abb.com/global/inabb/inabb509.nsf/0/51663da1af2c5e9f652571bc00388c76/$file/TCS+Brochure.pdf