Introduction to Trapped Key Interlocking for Machinery Safety


Ensuring the safety of your machinery is essential for the well-being of your employees and the efficiency of your operations. One effective way to improve machinery safety is through the use of trapped key interlocking systems.

What is Trapped Key Interlocking?



Trapped key interlocking is a type of safety system that uses a series of locks and keys to control access to hazardous areas of machinery.

How Trapped Key Interlocking Enhances Lock out Tag out



Lock out tag out is a procedure that is used to ensure that machinery is safe to work on by disconnecting it from all sources of hazardous energy. Trapped key interlocking enhance lock-out tag-out by mechanically forcing a sequence of shutting down a machine before it can be accessed.  The system may require an operator to insert a key into a lock to unlock a guard.

The Benefits of Trapped Key Interlocking for Machinery Safety


Trapped key interlocking systems provide a number of benefits for machinery safety. These systems can:

  • Help ensure compliance with safety regulations and standards
  • Improve lock-out tag-out procedures
  • Reduce the risk of incidents and injuries
  • Reduce the need for wiring
  • Increase the overall safety of your machinery and operations



Every piece of machinery has unique safety requirements and trapped key interlocking systems should be customized to meet the specific needs of each piece of equipment. At Fortress Safety, we have a team of application experts who can help you determine the right trapped key interlocking system for your machinery and ensure that it meets all relevant safety standards.

Contact Us for Help with Trapped Key Interlocking Systems

Our team of application experts is here to help you ensure the safety of your equipment and meet all relevant safety requirements.

Using Trapped Key Interlocking to Enhance Lockout / Tagout


Mechanical Trapped Key