Our Access/Chains Trapped Key Interlock Switches allow access to hazardous areas only when an appropriate key is inserted into the interlock. These stainless steel access interlocks provide a rugged, industrial grade method of helping prevent access through gates. They are actuated by either a lever or a rod that is connected to chain.

Our Miniature Valve Trapped Key Interlock Switches are an ideal solution for applications where space is at a premium. Features include locked open or locked closed options.

Our Rotary Trapped Key Interlock Switches are used for electrical isolation of machinery to improve safe access and also as teach boxes in robot cells. Once the power has been turned off, the key can be withdrawn and used in the next sequence of operation such as unlocking an access hatch or allowing valves to be operated. The rotary s...

Slamlock™ Trapped Key Interlock Switches combine the features of trapped keys with tongue actuated interlocks. When the actuator is inserted into the interlock (guard closed), the trapped key can be rotated and removed. With the key free, the actuator cannot be removed. This locks the guard door. The trapped key must be re-inserted and...

Our Bolt Trapped Key Interlock Switches allow access to hazardous areas only when an appropriate key is inserted into the interlock. These stainless steel bolt interlocks provide a rugged, industrial grade method of helping prevent access through gates. With these bolt interlocks, there is no need to run power wires to the gate. These ...

Our Exchange Units for Trapped Key Interlock Switches are used in an interlocking sequence to link together other devices in the ProSafe® range. These units cater to more complex operating sequences.

Our Trapped Key Solenoid Release Unit electrically isolates machinery to improve access safety. The unit consists of a rotary power switch and a solenoid. The trapped key can be removed once an external signal is given to its internal solenoid locking mechanism. An indicator light on the solenoid release unit shows when the trapped key...

Our ProSafe® Stopped Motion Unit (SMU) is used in applications that require the detection of stopped motion of mechanical parts of a machine. The SMU uses inductive proximity sensors to detect motion and the CU2 control unit to monitor the sensors.

Our Trapped Key Switchgear Adaptor is used to interlock preparatory switch gear applications or other host equipment such as spool valves. Power is isolated and locked off when the key is rotated and removed. The key can then be used in the next sequence of operation.

Our Electronic Timed-delay Unit Trapped Key Interlock Switches are used in applications that require an elapsed time to occur before allowing access to a hazardous area. This interlock switch uses a SI Guardmaster® safety relay in combination with an EMD Guardmaster safety relay to execute the timing sequence. Turning a non-removable k...