Undervoltage release for SIRIUS S00 motor-protective circuit breakers
The Siemens 3RV1922-1CN6 is a SIRIUS-brand undervoltage release rated 200 V, designed to trip a connected S00-frame motor-protective circuit breaker when its supply voltage drops below the dropout threshold. It incorporates a leading auxiliary switch that changes state before the main contacts open, giving the control system early warning of an impending trip.
Panel integration and fit
The leading auxiliary switch provides a normally-open contact that closes before the breaker trips, which can be wired into a PLC input or safety relay to trigger a controlled stop sequence rather than an uncontrolled coast-down. No additional wiring space is needed beyond the breaker's own terminal clearance.