The Siemens door-coupling rotary operating mechanism, designed for compatibility with the 3VL1, 3VL2, and 3VL3 circuit breakers, features an operating shaft size of 8 x 8 mm. Notably, it includes an extension shaft, enhancing its functionality, while offering a lockable design for added security. Extension shaft included Lockable design ensures secure operation and prevents unintended use Compatibility with multiple model series allows for flexible integration