SIRIUS 3RV2 motor starter protectors
4.4 Functions
SIRIUS Innovations
390 System Manual, 01/2011, A8E56203870002-03
4.4.2 Phase loss sensitivity
The phase loss sensitivity of the motor starter protector ensures that it trips in good time in
the event of a phase failure or significant phase unbalance. The motor starter protector
tripping prevents overcurrents from occurring in the remaining phases.
4.4.3 Protecting single-phase loads or DC loads
Under normal operating conditions, the three poles of the device are loaded. You are
recommended to switch all 3 main current paths of the motor starter protector in series to
protect single-phase or DC loads.
4.4.4 Test function
The TEST slide can be used to check whether the operational motor starter protector is
working correctly (not on the 3RV23/3RV27/3RV28). The tripping of the motor starter
protector can be simulated by moving the slide.
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