Trapped Key ASRS



This ASRS safety application is achieved entirely though trapped key, meaning there is no wiring required to the gates of each aisle of the system. A panel of several key switches are wired to the system but are kept in one place, though this method means that access can be relatively slow it is a very cost effective way of configuring a system, using personnel (safety) keys to keep people safe once they have entered an aisle.


We have done small systems with just a few key switches, all the way up to systems with over 150 aisles!



Click on the different sections of the ASRS application below to learn more about the Fortress solution!



Symbotic ASRS
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mGard Unit on Gate

The aisle is accessed by inserting the key from the panel associated with the specific aisle. The gate can then be opened once the personnel (safety) key is removed.

This key is your operator or engineers safety guarantee - its hard to see people in these long aisles so someone might see an inactive aisle, think no one is inside it and try to restart the machine. However as long as the person accessing the aisle has that personnel key in their pocket no one can remove the key switch key from the gate and stat the aisle back up.

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mGard Panel

A panel of key switches, each represent the control of an aisle, referred to as a mode selection switch in EN 528 and EN 14119. This means that each aisle is controlled with unique coding as dictated by EN 528 section 4.3.5.

The keys are held in place by a solenoid and so only get released once an aisle has been safety powered down, once removed the switch is triggered so the aisle will not be restarted until the key is replaced.

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Trapped Key Webinar

To learn more, see our Fortress Webinar - Trapped Key Interlocking Smarter Than You Think...Who Knew? on YouTube.

-[Click here to watch]-




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Heavy Duty Interlocks 

amGardpro Range

Trapped Key Interlocks 

mGard Range

 Medium Duty Interlocks 

tGard Range

Safety Standards Articles 

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View PDF Version 

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