The rotary limit switch is a device used for controlling the movement of industrial machines.
It is an auxiliary control and therefore commands the machine via a power interface, such as a contactor (or a PLC). Suitable for heavy use, it is connected by a shaft to a motor so that after a certain number of revolutions the cams operate the switches to start the pre-set movement. A worm gear and a helical toothed gear combined with one or more pairs of straight toothed gears are used to transmit movement from the input shaft to the output shaft.

Transmission ratios result from the use of different combinations of gear wheels between the input shaft and the output shaft, which is connected to the cams that operate the switches. The gear ratio ranges from 1:1 to (1:9400).

Transmission and gear drive shafts are in stainless steel to prevent oxidisation and wear. The gear wheels and driving bushes are in self-lubricating thermoplastic to reduce wear to a minimum and to maintain the accuracy of the couplings over time. Sintered bronze bushes are moulded into the base of the limit switch, to optimise shaft rotation and prevent it rubbing against plastic.

Each cam can be regulated with great accuracy using the cam adjusting screws. The auxiliary switches are positive-opening and can be used for safety purposes. There is also a direct-control version, which allows direct control of the motor.

All the materials and parts used are resistant to atmospheric agents and guarantee that the device is water- and dust-proof.

Available with cable entry clamp from below.

The base of the limit switch, in die-cast aluminium, has excellent resistance characteristics and ball bearings to optimise rotation of the shaft and prevent rubbing.