trapped,isolated,identify,sources,control,switches,machine,without,exchange,suitable,fortress,safeguarding,modular,interlocks,hazardous,arrangement,extension,instance,because,extended,rundown,interlocking,immediately,pressure,radiation,applications,potentially,actuators,present,personal,prevent,accidental,particles,flammable,besides,isolation,mechanical,configurations,explosive,safeguarded

 

What is 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 use up to SIL 3 (EN/IEC 62061), Category 4 and PLe (EN/ISO 13849-1). 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.

The principles of trapped key technology apply to all industries where it is essential that all energy sources are isolated before gaining access to machinery. Almost all safety issues can simply be solved by selecting the required products in order of the steps shown on this page.

All Fortress Interlocks electrical switches have a European, Canadian and North American approvals.

1 power and control isolation

Identify the energy sources to be isolated and/or any hazard that cannot immediately be isolated such as; heat, pressure, radiation or machine rundown time.

 

2 key exchange

Identify the type and number of access points.

Because of the modular arrangement of mGard both key exchange and door lock units can easily be extended with an extension module (XMA), for instance when doors are added to the safeguarded area or machine.

The Fortress Trapped Key System allows the safeguarding of potentially hazardous areas without the need of wiring.

Besides the ATEX switches all mechanical mGard configurations are also suitable for use in areas where explosive or flammable gases for dust particles may be present.

 

3 door locks and actuators

Identify the type of access point; part body or full body access doors with or without the use of personal safety keys (to prevent accidental lock in).