Limit Switches

TER Limit Switches: Rotary and Position Limit Switches for US Overhead Crane and Hoist Applications

Crane-Controls.com stocks two distinct categories of TER limit switch for US overhead crane, hoist, and industrial machinery applications — rotary limit switches and position limit switches. Both types enforce the travel limits and over-travel protection that OSHA 1910.179 and ASME B30 require for US overhead crane installations, but they operate on fundamentally different principles and are specified for different application conditions.

TER Rotary Limit Switches mount directly to a rotating shaft — typically the crane bridge, trolley, or hoist drive shaft or gearbox output — and measure shaft rotation angle and number of revolutions continuously throughout crane operation. Because they monitor the drive shaft directly rather than detecting a physical position along the travel path, rotary limit switches provide multi-point programmable switching across the full travel range of the crane motion — enabling slow-down switching before end-of-travel as well as final stop switching at the travel limit. Rotary limit switches are the preferred specification for bridge, trolley, and hoist travel limit control where programmable multi-point position sensing and continuous rotation monitoring are required. Crane-Controls.com stocks TER rotary limit switches across the Base, Fox, Oscar, Top, GF4C, and PF2C series.

TER Position Limit Switches are physically actuated by contact with a moving machine component — a crane bridge bumper, trolley stop, hoist hook block, or runway end stop — triggering a switching action at a defined fixed point along the travel path. Position limit switches do not monitor continuous travel — they respond to a single physical actuation event at the point where the actuator contacts the switch. They are the standard specification for hoist over-travel protection where a simple, reliable electromechanical stop is required at a fixed point, and for crane runway end-of-travel applications where the cross-actuator configuration of the TER Cross Limit Switch engages the runway stop from either direction of bridge travel. Crane-Controls.com stocks TER position limit switches in DIN, Standard, and Cross Limit Switch configurations.

Crane-Controls.com's technical team provides pre-sale application support for limit switch type selection, series specification, and cross-referencing of existing TER installations. OSHA, CMAA, and ASME B30 compliant installations supported.