Patent ID: 6987234

Claim:
A circuit-breaker comprising a control assembly having a driving first splined control shaft, the circuit-breaker also including an interrupting chamber having at least one moving arcing contact and also a driven second splined control shaft for moving the moving contact between opening and closure positions, the circuit-breaker further including a synchronization assembly for synchronizing said driving and driven shafts, said synchronization assembly comprising two levers, each of which is provided with a splined ring for co-operating with a corresponding splined control shaft, and two connection rods, each of which is hinged at opposite ends thereof to respective ones of said levers; wherein one of said splined rings has a number of meshing elements that is different from a number of meshing elements on the splined control shaft with which it co-operates, and wherein an adapter is interposed between said one of said splined rings and said splined control shaft with which it co-operates, said adapter having internal meshing elements for co-operating with the meshing elements on the splined control shaft with which said one of said splined rings co-operates and external meshing elements for co-operating with the meshing elements on said one of said splined rings.