The Siemens SIRIUS 3RV2926-2BA00 is a door-coupling rotary operating mechanism designed for heavy-duty operating conditions, fitting circuit breaker sizes S00 and S0. It comes with a gray handle and a 47 mm shaft length, intended for panel-mounted applications where the breaker needs to be operated from the enclosure door.
This part is in product phase-out. The manufacturer lists a successor, the 3RV2926-3B, which requires a drilling pattern change on the mounting surface. The phase-out means that for new panel builds or replacements, you'll want to plan for the successor model and account for the panel modification.
Mounts to the enclosure door and couples to the circuit breaker's rotary handle. The 47 mm shaft length determines the door thickness it can accommodate. The gray handle provides visual position indication (ON/OFF/TRIPPED) for the breaker state without opening the panel door. For size S00 and S0 Siemens SIRIUS breakers, this is the direct-fit operating mechanism.