The Siemens 3RV1926-0CA00-0FJ0 is a door-coupling rotary mechanism designed for emergency-stop applications, rated IP55, fitting circuit breaker sizes S0 through S3 with a 130mm shaft. This is the mechanical interface that lets you mount the rotary E-stop operator on the enclosure door while coupling it to the breaker's rotary drive underneath — keeps the IP55 seal intact and gives a positive mechanical disconnect feel at the door handle.
Installation Context
The 130mm shaft length suits standard enclosure depths for S0-S3 breaker frames; the IP55 rating means it handles washdown environments and outdoor cabinet installations where water spray is a concern. Mounts through the enclosure door panel — the rotary handle stays on the outside, the coupling mechanism engages the breaker's rotary drive inside. No special tools beyond a panel cutout.