The Siemens 3RV1926-0KA00-0FJ0 is a door-coupling rotary mechanism rated IP55, designed for use with circuit-breaker sizes S0, S1, S2, and S3. It comes with a 330mm shaft and support bracket, finished in black, and is manufactured by Fa. Benedikt & Jaeger. This is the mechanical interface that lets you operate the breaker handle from outside the enclosure door while maintaining the IP55 seal.
The mechanism fits Siemens 3RV2 circuit-breaker frames S0 through S3. The 330mm shaft length suits standard-depth enclosures where the breaker is mounted on a backplate and the operating handle needs to reach the door. The IP55 rating means the door seal stays effective against dust and water jets — suitable for panel environments that see washdown or outdoor exposure.