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Key Releases

Fortress Interlocks have varies types of Key Release systems, including:

The S / SE Isolator units - suitable for isolation or switching current and may be used to isolate power to machinery.

  • Direct drive operation - positively opens contacts
  • The standard sequence is: Key trapped (but not locked) - Power on, Key free - Power off (other sequences to be specified)
  • Special switch ratings and/or contact arrangements available on request
  • Enclosed SE version durable and robust Aluminium housing


The SS solenoid isolator units are used where the key / keys need to remain trapped until an electrical signal has been received:

  • Direct drive operation - positively opens contacts
  • Suitable for machines with a rundown cycle
  • The standard sequence is: Solenoid de-energised - Key trapped, Solenoid energised - Key free (other sequences available)
  • Special switch ratings, solenoid voltage and/or contact arrangements available on request
  • Solenoid monitoring contacts as standard

The ODL are ‘key bank’ key release control units with an isloator switch. It incorporates one or more rotary switches and any combination of trapped or freed keys.

  • Direct drive operation - positively opens contacts
  • Mild steel enclosure as standard
  • Special switch ratings and/or contact arrangements available on request
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