To optimize lockout tagout procedures, KIRK® Trapped Key Interlocks ensure energy isolation procedures cannot be circumvented. Key is removed from trapped key interlock and is with person leading lockout tagout procedure. Equipment cannot be re-energized until uniquely coded KIRK® key has been re-entered into sequence after all workers are clear from completed task and out of harm’s way. To allow hazardous energy to dissipate prior to allowing access, time delay unit can be added into process.