Undervoltage release for SIRIUS 3RV motor circuit breakers
The Siemens 3RV1922-1CV1 is a SIRIUS undervoltage release designed to drop out the motor circuit breaker when control voltage falls below the dropout threshold. The release snaps onto 35 mm DIN rail and fits SIRIUS 3RV breaker frames S00, S0, S2, and S3. Two normally-open leading auxiliary contacts provide status feedback ahead of the main contacts — useful for signaling a pending dropout to a PLC or safety relay before the load actually drops.
The release measures 18.5 mm wide by 90 mm high by 68 mm deep. That 18.5 mm width matches a single 18 mm DIN module pitch, so it occupies one position on the rail. Snap-on mounting means no tools for installation — press onto the DIN rail alongside the breaker.
Environmental and electrical ratings
Insulation voltage is rated 690 V AC with pollution degree 3. The control supply voltage is AC only.