Undervoltage release for 3RV2 motor circuit breakers
The Siemens 3RV2922-1CP0 is a SIRIUS undervoltage release designed as a snap-on accessory for 3RV2 motor circuit breakers in frame sizes S00, S0, S2, and S3. The coil is rated 230 V AC at 50 Hz and 240 V AC at 60 Hz, with a 50...60 Hz supply frequency range, so it covers both 50 Hz and 60 Hz installations without a separate coil change. It carries 2 normally-open (NO) leading auxiliary contacts, meaning the auxiliary circuit makes before the main contacts close and breaks after they open — useful for signaling the breaker state or interlocking a downstream contactor. The break time is rated at a maximum of 20 ms, fast enough to protect motor loads from sustained undervoltage conditions.
Integration into a 3RV2 panel
Snap-on mounting onto the 3RV2 breaker body — no separate DIN-rail footprint required. The release adds 19 mm width to the breaker assembly and extends depth to 68 mm. Screw-type terminals for the auxiliary and control circuit accept standard stranded or solid wire; no special tooling needed. The 690 V rated insulation voltage matches the 3RV2 breaker's own rating, so the release doesn't derate the assembly.
Substance prohibitance date of 05/01/2012 indicates RoHS compliance per the EU directive; no separate REACH or UL listing is recorded in the spec sheet, but the SIRIUS series typically carries CE and UL/CSA marks (verify against your specific panel certification requirements).