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Fortress Interlocks mGard 

mGard is the premier range of modular robust trapped key interlocks for heavy duty applications. Trapped key interlocking is a tried and tested method of mechanically safeguarding dangerous machines and hazardous processes, and is suitable for category 4 applications. It is called "Trapped Key" as it works by releasing and trapping keys in a predetermined sequence. After the control or power has been isolated, a key is released that can be used to grant access to individual or multiple doors.

mGard Product Range

  • Control Isolation
  • Power Isolation
  • Key Exchange Units
  • Access Interlocks
  • Valve Interlocks


For more information, application assistance, or to place an order, please call us at 203-426-7700