Functions
5.4 Indication of the operating state
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
56 Manual, 09/2016, A5E03656507420A/RS-AB/003
Indication of the operating state
The prevailing operating state of the 3RU21, 3RB20 / 3RB21 and 3RB30 / 3RB31 relays is
indicated by the position of the marker on the "TEST function / Switch position indicator"
slide.
If the relays are operating without errors, the slide marker will be set to "I". When a device
trips, the slide marker moves to "0". An overload relay can trip for the following reasons:
● Overload
● Phase asymmetry
● Phase failure
● Ground fault (3RB21 / 3RB31)
● Internal fault (3RB20 / 3RB21 and 3RB30 / 3RB31)
Depending on the setting, the relay is reset manually or automatically after a recovery time
has elapsed.
Additional information...
Can be found in the chapter titled...
RESET after release (Page 117)
Self-monitoring (3RB20 / 3RB21 and 3RB30 / 3RB31 only)
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays constantly monitor their
ability to operate (self-monitoring) and trip in the event of an internal error.
In such cases you need to contact Technical Assistance on the Internet
(http://www.siemens.com/sirius/technical-assistance)
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