The new modular system for hand operating mechanisms covers the torque ranges up to 10 nm and from 10 to 100 nm. Both permanently-installed and detachable models, capable of taking various sections of switch shaft, are available for each torque range. The lockable blanking plate, which is designed to VDE 0113, can be used throughout the range, irrespective of the type of handle fitted. Owing to the modular system employed, the number of spares can be kept to a minimum. The many different mechanism models required in switchgear engineering can be assembled by combining the parts in various ways.