It mounts to Size S0 through S3 Siemens SIRIUS motor-protective circuit breakers, providing undervoltage protection for the downstream load. The integrated 2 NO leading auxiliary switch signals the breaker state to a PLC or status lamp without requiring a separate aux block.
Sourcing reality — phased out, successor available
This part is explicitly marked as a phased-out product. The manufacturer lists the successor as the SIRIUS 3RV2 series — the 3RV1922-1CF0 is the 3RV1-generation release. For new BOM lines or panel builds, specify the 3RV2 equivalent directly.
Integration notes for the 3RV1 platform
The release snaps onto the left side of any SIRIUS 3RV1 Size S0, S1, S2, or S3 circuit breaker. The 110 V AC 50 Hz coil connects to the control circuit; when voltage falls below the dropout threshold the breaker trips, and the 2 NO leading auxiliary contacts change state before the main contacts open. No extra wiring to the breaker's load terminals is needed — the release draws its mechanical trip force from the breaker's stored-energy mechanism.