Leading Manufacturer of Safety Interlock Switches and Machine Guard Safety Switch Devices for Automation and Process Safety

CS-Range Trapped Key Control Switch and Key Exchange System (Die-Cast)

The CS-Range combines isolation and key exchange into one convenient, panel mounted system. Every barrel location can either be monitored with or without solenoid release or mechanically operated only, depending on your requirements.

Traditionally, the top key will be monitored, and the remaining keys mechanically released once the first key is free, but in some systems, every key is monitored and/or solenoid controlled. The flexibility of this system means it can meet your most complex requirements.

The ‘reverse’ key version means the control switch is active when the key is not present. Inserting and turning the key closes the outputs, stopping the hazardous process. This is often used when the machine requires an “authority key” to be present before access the machine or, you have multiple isolation methods required before it is safe to enter.

For systems with more than 10 keys, we recommend using the MX panel arrangement shown below. The MX panel is available with 2, 3 and 5 vertical rows to reduce the length of your system.

Note: Although the parts are ordered separately, the system is factory assembled, ready for use straight out of the box.

Traditional Trapped Key System


 trapped key interlock system
CS-Range trapped key interlock system

A traditional Trapped Key System uses a safe sequence of operations through that transfer of keys that are either trapped or released in a predetermined order. For example, a key is used to isolate a power source, this key is then released and can then be used to gain access through a gate or door to a high risk area by inserting it into an access lock.

The CS-Range works in a similar way but instead of transferring the isolation switch key to a key exchange, it combines the two together. The control switch key can also be used as an access lock key, reducing the total number of keys required.

Step 1: Choose the number of control switches required.

The CS-Range is completely flexible, allowing every barrel position to be monitored with or without solenoid key release (if required). Usually only one is required with the remaining keys released mechanically.
M-CS-SKR and M-CS control switch isolation mechanical trapped key
Part NumberPart Description


Monitored 4NC + 2NO


Monitored 4NC + 2NO Reversed Key

Part NumberPart Description


Monitored 4NC + 2NO with Solenoid Key Release


Monitored 4NC + 2NO Solenoid Controlled Reversed Key

Step 2: Select the number of mechanically released keys.

The M-KR mechanically released key barrel is fully compatible with the CS-Range. Traditionally, the M-KR is used to release the access lock keys.For example: If you have 5 access locks, you will need to order x 1 M-CS or M-CS-SKR and 4 x M-KR.
mechanically released trapped key
Part NumberPart Description


1 Mechanically Released Key

Step 3: Select your mounting arrangement.

The CS-Range is available with panel mount enclosure kits. The number of keys required determines the mounting kit. For example; a 5 key system requires a P-5WAY kit.

If you are restricted on height, the MX panel style separates the keys in to vertical rows. They are available in 8, 12 and 20 way panels. Any unused barrels can sealed using a blanking cap.

CS-Range panel mount options
MX panel mount arrangement for trapped key interlock key exchange
Part NumberPart Description


Panel Mount Enclosure Kit 2-Way


Panel Mount Enclosure Kit 3-Way


Panel Mount Enclosure Kit 4-Way


Panel Mount Enclosure Kit 5-Way


Panel Mount Enclosure Kit 6-Way


Panel Mount Enclosure Kit 7-Way


Panel Mount Enclosure Kit 8-Way


Panel Mount Enclosure Kit 9-Way


Panel Mount Enclosure Kit 10-Way

For larger panel mount kits, please contact IDEM Safety Switches