Leading Manufacturer of Safety Interlock Switches and Machine Guard Safety Switch Devices for Automation and Process Safety

Trapped Key Control Isolation Switch (Die-Cast)

Trapped key control switches are used to change the state of switch contacts to isolate electrical energy to a particular control system. The stop signal is initiated via an internal contact block that is controlled by the key’s position. During normal operation, the contacts are closed and the electrical circuit is complete.

Each trapped key control switch unit is fitted with an internal contact block, suitable for switching low currents from safety relays and PLC’S. Turning the key to the OFF position opens the safety contacts and sends a STOP signal to the control circuit.

Upon isolation, the key can be freed and transferred to the next stage of the trapped key interlocking system. Only when the key is returned, can the control circuit be restored, and the hazardous process be restarted.

  • Mirror Polished Die-Cast Aluminum
  • Panel Mount or Robust External Mounting
  • Large Range of Contact Configurations
  • M-ISB-CB Capable of IP67 Protection