Multi-pole power switch for 3-phase load, has feedback torque exerted on switch shaft by one switch pole reduced relative to feedback torque exerted on switch shaft by further switch pole

摘要

The power switch (10) has at least 2 stationary contact devices (12) and at least 2 movable contact devices (14), each having a contact carrier (16) and a contact element (18), operated by rotation of a switch shaft (20) via a respective mechanical coupling device (22). The feedback torque (Mr,red) exerted on the switch shaft by one switch pole is reduced relative to the feedback torque (Mr) exerted on the switch shaft by at least one further switch pole, by reducing the effective lever length of its coupling device.