The Siemens 3RV2946-2B is a door-coupling rotary operating mechanism from the SIRIUS family, designed for heavy-duty operation of circuit breakers in the S3 frame size. It mounts via screw fixing in any position and provides a gray handle to extend the breaker's toggle through an enclosure door, rated for up to 15 operations per hour. This mechanism includes an interlock and can be locked in the OFF position — a critical safety feature for lockout/tagout procedures on motor control centers or distribution panels where positive disconnection must be verified from outside the enclosure.
The 3RV2946-2B is in product phase-out. The official successor is the 3RV2946-3B, which carries a drilling pattern change — meaning a panel already cut for the -2B variant will need rework or an adapter plate to accept the replacement.
The screw-fixing method and any-position mounting simplify panel integration — no special bracket or orientation required.