Benefits of TKI

Benefits of TKI

What is a Trapped Key Interlock?

A trapped key interlock is a safety device applied to two or more moveable parts, preventing (or allowing) a movement or operation of one part only when another part is locked in a predetermined position. KIRK® trapped key interlocks operate on the principle that the key can be removed only when the locking bolt is in a predetermined position.

The KIRK® interlock is used to protect personnel and equipment, with the goal of eliminating errors that can occur when it is necessary to obey a sequence of predefined operations. The KIRK® system prevents anyone from trying to circumvent the default and crucial to the safety of the procedure sequence. The KIRK® interlocks can be mounted directly on the equipment, ie, the system is fully integrated and simple to operate.

Why use a Trapped Key Interlock System?

  • TO PROTECT personnel from hazards by ensuring predetermined sequences of operations are followed

  • TO PREVENT loss of operations and setbacks due to equipment damaged  by mis-followed operations

  • TO PROVIDE risk control; understanding that everyone has the right to be safe at work!

Installing a trapped key interlock system ensures a predetermined sequence of events is followed. Whereas Lock Out – Tag Out (LOTO) provides a visual warning and some protection, a trapped key interlock system physically prevents a specific set of actions until the previous action(s) have been completed.


In excess of 70% of reported accidents world-wide in the industrial marketplace are attributable to human error, accounting for 90% of the financial loss.

Written operating procedures alone cannot prevent the inadvertent operation of equipment out of sequence.