Position / Limit Switches

A position limit switch mechanically detects when a moving machine or conveyor component reaches a defined point. The contact signal can confirm position, limit travel or support a stop command. KBT provides standard and ATEX models with different housings, levers, contacts and mounting arrangements. Selection should consider movement direction, trip force, operating frequency and environmental conditions.

The actuator must meet the moving part at a safe angle and within the permitted travel. The contact signal is normally processed by a PLC, relay or safety circuit designed for the application.

Technical specifications and procurement documents commonly use “position limit switch”, “industrial position switch”, “mechanical limit switch”, “conveyor position switch” and “mechanical position switch”. Depending on the region and the monitored function, “machine travel limit switch”, “end position switch”, “roller lever limit switch” and “industrial travel switch” may also appear. These expressions overlap, but they do not make two devices interchangeable without checking actuator geometry, contacts, environmental limits and certification.

Relevant KBT product families on this category page include NSR22-PS, NSR55-PS and NSR66-PS. The model code identifies a product family; the exact actuator, contact arrangement, enclosure and certification must be confirmed from the selected version.

Selection must start with actual site data rather than a model name. Record Movement direction and actuator type, NO/NC contact arrangement, Operating frequency and mechanical life, Temperature, dust, water and impact and ATEX requirement for classified areas. Compare the shortlist with the current data sheet, dimensional drawing, certificate and control architecture; do not infer an unknown rating from a similar enclosure.

• Movement direction and actuator type
• NO/NC contact arrangement
• Operating frequency and mechanical life
• Temperature, dust, water and impact
• ATEX requirement for classified areas

Exact limits, contact ratings and certification markings must be verified in the current product data sheet before ordering or commissioning. This verification applies specifically to the selected position limit switch configuration.

Position the switch so the moving element reaches the actuator within the permitted travel without side loading. Protect the cable from motion and sharp edges. During commissioning, test approach and release directions separately and verify trip, reset, reversal and stop positions against the machine safety sequence.

Used on conveyors, cranes, gates, dampers, chutes, lifting systems and heavy machinery.

The position limit switch is a field device within a wider machine-control or safety function. Contact arrangement, PLC input, relay logic, alarm stage, stop stage and restart permission must be defined from the risk assessment. A contact change at the device is not sufficient proof: commissioning must confirm that the intended alarm or safe stop occurs at the machine.

Share the movement direction, trip method and required contacts; we will help select the appropriate position switch.

Check free actuator movement, spring return, mounting alignment, cable entry and contact operation. A loose machine bracket or changed mechanical stop can make a healthy switch operate at the wrong position. Maintenance records should therefore include the measured trip position, not only an electrical continuity test.