Functions
5.6 Additional functions
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
57
Additional functions
RESET function
There are various ways to reset the device following an overload release.
Table 5- 4 RESET options for for overload relays
Mech. remote RESET
(accessory)
3RU21 ✓ ✓ ✓ ✓ ✓
(accessories)
3RB21 / 3RB31 ✓ ✓ ✓ ✓ ✓
(integrated)
The relay cannot be reset until after the recovery time has elapsed.
can be found in the Chapter ...
about optional mechanical and electrical RESET
Accessories (Page 123).
Stop function (3RU21 only)
Pressing the STOP button on the 3RU21 thermal overload relay opens the NC contact,
thereby disconnecting the downstream contactor and thus the load. In the case of
maintained-contact operation in the auxiliary circuit, the load is switched back on via the
contactor when the red STOP button is released.
Test function for the 3RU21 thermal overload relay
The TEST slide can be used to check whether the operational 3RU21 thermal overload relay
is working properly. The tripping of the relay can be simulated by moving the slide. This
simulation process opens the NC contact (95-96) and closes the NO contact (97-98), thereby
checking that the auxiliary circuit has been wired to the overload relay correctly.
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