Schmersal TR236-20Z Limit Switch

Schmersal TR 236-20Z is a compact, roller-actuated limit switch with a fiberglass-reinforced plastic housing designed for robust, space-efficient machine safety interlock duties. It features two external contacts, a single M20 × 1.5 cable entry, and a roller-type actuator head that can be repositioned in four 90° increments for flexible mounting. The housing is double insulated and resinous, with a plastic body rated to resist oil and petroleum spirit, and the unit weighs about 60 g. Its dimensions are 30 mm wide by 58.5 mm high by 30 mm deep, and mounting complies with EN 50047. Actuation is achievable at a minimum force of 9 N with a minimum 19 N breakaway force, and the actuator speed ranges from 120 mm/min to 1 m/s, enabling reliable operation across a variety of stroke lengths. The device provides a mechanical life of at least 20,000,000 cycles, making it suitable for high-cycle automation tasks, while its head rotation capability supports adaptation to different operator geometries. A broad range of alternative actuators can be paired with this TR 236-20Z base, enabling integration into safety circuits, machine controls, and other limit-switch applications where compact size and dependable performance are essential.