SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
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Setting the current
Setting the rated motor current on 3RU21 and 3RB20 / 3RB21, 3RB30 / 3RB31 overload relays
3RU21 thermal overload relays and 3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload
relays are set to the rated motor current with a rotary knob.
Note
The overload relays may only be set between the upper and lower setting marks on the
scale. A setting below or above the setting scale is not permissible.
The figure below shows how to set the rated motor current based on the example of the
3RU21 thermal overload relay, size S0.
Figure 9-1 Setting the current I
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