Patent ID: 7863530

Claim:
A modular switching device comprising a plurality of interconnected modules, said modules comprising a control device module and a pole cell module, said modules of the switching device being interconnected with a shaft adapted to transfer a torque required for operating the switching device from one module to another module, wherein each module comprises a shaft element, and wherein said shaft transferring the torque is composed of directly interconnected shaft elements, both ends of a shaft element of each module being provided with a connecting member for connecting the shaft element to a shaft element of an adjacent module, a connecting member provided at a first end of the shaft element of each module being a male connecting member of a grooved shaft type having a plurality of teeth, and a connecting member provided at a second end is a female connecting member adapted to be connected to a male connecting member of an adjacent module, the shaft element of each module comprising means for connecting the shaft element to a shaft element of an additional module, said means for connecting the shaft element to a shaft element of an additional module comprising at least one universal tooth formed on the male connecting member of the shaft element of each module, and a counterpart member for the at least one universal tooth formed at the female connecting member of the shaft element of each module, the at least one universal tooth having a shape different from the shape of the rest of the plurality of teeth formed on the male connecting member of the shaft element.