The Siemens SIRIUS 3RV2936-2B is a door-coupling rotary operating mechanism designed for heavy-duty operation of S2-size circuit breakers. It mounts via screw fixing in any position, with a 75 mm square panel cutout and a 78 mm depth behind the door — standard for S2 breaker enclosures. Rated for up to 151 operating cycles per hour and an ambient range of -20 to +70 °C during operation, with storage tolerance from -50 to +80 °C. The gray handle is the standard design variant.
This part is in phase-out. The official successor is 3RV2936-3B, which carries a different drilling pattern — so a direct drop-in replacement will require panel modification.