Trapped Key Interlocks

Fortress Interlocks’ mGard range of modular trapped key interlocks is best suited for heavy duty use for industrial safety.  The name, “trapped key”, refers to the way it works, meaning you can only release and trap the keys in a predetermined sequence, ensuring that doors/gates can be opened when the hazard is neutralised.

The trapped key interlock method is the way to mechanically safeguard dangerous machinery and hazardous processes, and I can be implemented for use to SIL 3 / Category 4.  It applies to all industries in which it is essential that the energy source is isolated before the machine can be accessed.