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Castell Safety - Trapped Key Safety Interlocks, Lockout Tagout Equipment and Drive-away Prevention
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Castell Safety - Trapped Key Safety Interlocks, Lockout Tagout Equipment and Drive-away PreventionCastellApplications

Applications - Machine Guarding - Bolt Interlock (Multi key) with Safety Switch

Product Usage: KLP


The bolt movement and the switch condition are directly controlled by the rotation of the keys. The bolt length can be varied to suite the application but the travel of the bolt from extended to retracted is always 19mm. The bolt length should be specified when ordering by quoting the 'L' dimension, This being the length of the bolt protruding from the end face with the key in the trapped position and the bolt retracted.
Key Exchange: The Primary Key is trapped, the Secondary Key is free and the bolt is extended. Insert secondary key and rotate, this enbles rotation and removal of the primary key which retracts of the bolt. The retraction/extension of the bolt changes the switch contact condition. The secondary key is now trapped in the lock.
Double Key: The Primary and Secondary Key are free and the bolt is extended. Insertion and rotation of both keys will retract the bolt. The retractio/extension of the bolt changes the switch contacts condition.

Typical System

The KLP is designed to operate as part of an integrated safety system, controlling the operation of HV/LV switchgear or valves. A typical example is shown below.

System Description


The electrical supply to the machine is switched on and the access doors to the hazardous area are locked closed. The initial key is held in the control room and only issued on a 'Permit to Work'.
To enter the area, the electrical supply is turned off and the initial key inserted into the KLP, which extends the bolt and allows the removal of the secondary key. The electrical supply is now locked in the off position and the contact on the KLP changed to provide visual indication at a control panel of the machine status.
The secondary key is then inserted into the 'X Key Exchange Box' to release a further two keys which are used to open the 'AI' access locks on the doors. Whilst these keys are out of the 'X box', the electrical supply key cannot be removed, ensuring that the power cannot be switched on whilst the access doors are open.

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