This is a type of lock that activates or deactivates control mechanisms, subsequently allowing manoeuvring by staff. These are normally used to block a switch, a circuit breaker or a ball valve in open or closed position. By inserting the key and turning it, a bolt will be actioned that will allow the operator to move the controls. The key will remain prisoner until the bolt is returned to its original position. Versions are available in 2/3 cylinders, interlocked or not interlocked. We give shape to your projects, please contact our offices for more information about the products available and achievable.