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Operation
9.5 Response of the auxiliary contacts
9.5
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.
NC 95/96
NO 97/98
Switch position
indicator 3RB3
Switch position
indicator 3RU21
82
READY
TEST
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
STOP
RESET
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Manual, 09/2014, A5E03656507420A/RS-AA/002
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- 3Ru21 Thermal Overload Relays
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