SIRIUS 3RU2/3RB3 overload relays
5.8 Operation
SIRIUS Innovations
522 System Manual, 01/2011, A8E56203870002-03
5.8.5 Response of the auxiliary contacts
Auxiliary contacts
The overload relay is equipped with an NO contact (NO 97-98) for the "tripped" signal and an
NC contact (NC 95-96) for disconnecting the contactor. The auxiliary contacts have high
contact reliability; this makes them suitable for PLCs. Furthermore, the high switching
capacity facilitates direct switching of the contactor coil.
The table below shows how the auxiliary contacts respond when the TEST, STOP (3RU21
only), and RESET buttons are pressed.
READY TEST STOP RESET
NC 95/96
NO 97/98
TRIP
1
0
1
0
1
0
1
0
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