Trip Circuit Supervision

To ensure that the breaker trip circuit is monitored both in pre-close as well as post-close conditions of the breaker.

If you mean... why is it wired like below..

It is because the test current [through TCS] goes through all the contact wiring as well as the trip coil, checking the continuity of the whole circuit - not just the trip coil - which is why it is called "Trip CIRCUIT Supervision" (TCS), not "Trip Coil Supervision". Some protection relays have two terminals for positive etc, so that supervision covers internal wiring and automatically causes a supervision alarm if the relay is unplugged.

If you put TCS directly across the contact on the left (take directly??) then TCS would only check the coil and not the contact wiring.

I have left out additional coils and circuits of some "96" supervision relays which stop a supervision alarm occurring when the contacts stay closed, shorting out TCS, or which monitor trip coil while it is tripped (the trip coil often has a "built-in" contact, called a "cut-throat contact" which stops it being permanently energized in the tripped state, if the coil is not continuously rated).

Thank you so much.. i was in doubt with this topic for so many days.. am now clear. here we are checking the status of breaker contact also through which trip comand is going.

Thank you for acknowledging our help.

Regards,

67model