Page top

Lead Contents

FAQ02315 of Safety Limit Switches FAQ

FAQ No. FAQ02315

Primary Contents


What is a form lock mechanism?


Safety Limit Switches use inflexible interlocking components, related to the direct opening mechanism (forcibly opened contacts), so that the components will not distort or come apart even if great force is applied to the Actuator by contact welding or other cause.

The following diagram shows an example using a rotating shaft and lever.

Note 1:
The lever cannot be mounted backwards because the protrusion and notch interlock so that the lever will not free-turn even if a large force is applied.

Note 2:
The Safety Limit Switches with changeable roller levers do not have the form lock mechanism.

Recommended Products


For Safety Light Curtain Robust & Basic New Lineup. Understanding the Indicators at a Glance.


Compact (104.5 mm), lightweight (1.3 kg) and easy-to-install Safety Laser Scanner


Supports ISO 13849-1 (PLe/Safety Category 4). Can be used on higher risk level applications by connecting to Safety Controllers.

Other Safety Limit Switches FAQ