The Siemens 3RV1902-1AV1 is a SIRIUS undervoltage release designed for motor circuit breakers in frame sizes S00, S0, S2, and S3. It operates on a 415 V AC control supply at 50 Hz and 480 V AC at 60 Hz, per the rated values. This is a phased-out product; the preferred successor is the 3RV2902-1AV1.
Fit and mounting
The 18.5 mm width and 68 mm depth keep it compact alongside the breaker. The front face carries an IP20 finger-safe rating per IEC 60529, so vertical contact from the front is protected — standard for a panel-mounted accessory. Pollution degree 3 environment is within spec.
The 3RV1902-1AV1 is flagged as a phased-out product. The official Siemens successor is the 3RV2902-1AV1, which is the preferred replacement type.