Undervoltage release for SIRIUS S00/S0 breakers
The Siemens 3RV6902-1AP0 is a SIRIUS undervoltage release designed specifically for motor circuit breakers in frame sizes S00 and S0. It operates on 230 V AC at 50 Hz or 240 V AC at 60 Hz, making it a drop-in accessory for panels built around these common line voltages. The snap-on mounting onto 35 mm DIN rail and screw-type terminals for the control circuit keep installation straightforward — no special tools beyond a screwdriver. Rated insulation voltage is 690 V with pollution degree 3, which covers most industrial control panel environments where conductive dust or humidity is present. The break time is a maximum of 20 ms — fast enough to drop the main contactor before a downstream fault escalates.
Integration into a motor circuit breaker panel
The release snaps onto the left side of a SIRIUS 3RV2 motor circuit breaker in frame S00 or S0. The 19 mm width means it adds minimal DIN rail real estate — useful when the panel is already tight on fill factor. The screw terminals accept the control wiring; no auxiliary contacts are integrated (leading contact 0, instantaneous contact 0), so any remote status indication must come from the breaker's own auxiliary switch block. Ambient operating range is -20 to +60 °C, storage from -50 to +80 °C. The 68 mm depth is shallower than a full-frame breaker, so it does not increase the overall panel depth beyond what the breaker itself requires.
Compliance and documentation
The product carries a substance prohibition date of 05/01/2012, indicating RoHS compliance from that date onward. The reference code per EN 61346-2 is F, which classifies it as a protective device in the function-oriented designation system. The design of short-circuit protection is fuse-based, consistent with the SIRIUS system architecture.