The Siemens SIRIUS 3RV2922-2CP0 is an undervoltage release for the 3RV2 motor circuit breaker family. It drops the breaker when control voltage falls below the dropout threshold. Coil rated for 230 V AC at 50 Hz and 240 V AC at 60 Hz, covering the common European and North American control supply voltages. The 50/60 Hz frequency range means it works on either grid without a separate transformer tap. Snap-on mounting onto a DIN rail — no tools needed for installation. The 18.5 mm width and 68 mm depth fit into a crowded panel.
Integration with 3RV2 Breakers
This release clips onto the left side of any 3RV2 motor circuit protector in frame sizes S00, S0, S2, or S3. The 2 NO leading contacts close before the main contacts engage, giving the control system a status signal that the undervoltage coil is healthy before the motor can start. Spring-loaded terminals accept solid or ferruled stranded wire — no screwdriver needed for termination. Degree of pollution 3 means it's rated for conductive pollution environments typical of industrial control panels — no additional conformal coating required for normal factory-floor conditions.