Operation
9.3 RESET after release
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
118 Manual, 09/2016, A5E03656507420A/RS-AB/003
Recovery time following overload release
This time gives the load a chance to cool down.
● 3RU21 thermal overload relays
The device cannot be reset until the bimetal strips have cooled down. The recovery time
is dependent upon the tripping characteristic curve and the extent of the tripping current.
● 3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays
In the case of the 3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays, the
recovery time is stored as a fixed value and is 3 minutes following a current-dependent
trip with automatic RESET selected.
Following a trip, the 3RB20 / 3RB21 and 3RB30 / 3RB31 overload relays can be
immediately reset locally on the device.
Setting the RESET function on the 3RU21 thermal overload relay
On the 3RU21 thermal overload relays, automatic and manual resetting is selected by
pressing and turning the blue button (RESET button). The figure below shows how to switch
between automatic and manual reset on the 3RU21 thermal overload relay, size S0.
Switching between manual and automatic on the 3RU21 thermal overload relay
Press the blue RESET button down with a screwdriver.
Turn the blue RESET button to M (manual reset) or A (automatic reset).
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