Trapped Key InterlocksEngineered Products


Fortress Interlocks 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, High Voltage switchgear and hazardous processes and is suitable for use up to SIL3(EN/IEC 62061, Category 4 and PLe (EN/ISO 13849-1).

See below for more information:

Fortress Overview

mGard Brochure

mGard Range Card

Mining Show Brochure 




NEW! product release from Fortress Interlocks features mGard Mounting Brackets suitable to all mounting arrangements for model locks.

mGard Mounting Bracket

Trapped Key Interlock Products

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