SIRIUS 3RU2/3RB3 overload relays
5.8 Operation
SIRIUS Innovations
516 System Manual, 01/2011, A8E56203870002-03
5.8 Operation
5.8.1 Setting the current
Setting the rated motor current on 3RU21/3RB30/3RB31 overload relays
3RU21 thermal overload relays and 3RB30/3RB31 solid-state overload relays are set to the
rated motor current with a rotary knob. The scale on the rotary knob is in amperes.
NOTICE
The overload relays may only be set between the setting marks at the top and the bottom of
the scale; in other words, a setting above or below the setting scale is not permitted.
The figure below shows how to set the rated motor current based on the example of the
3RU21 thermal overload relay, size S0.
max. + 60 °C
max. + 70 °C
A
I
e
Figure 5-4 Setting the current I
e
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