KLS Locks is a Bulgaria-based engineering company specializing in Custom Trapped Key Interlock Solutions for industrial safety. We help high-risk industries ensure reliable, fail-safe operation and protect both people and equipment.

Our mission is to engineer systems that eliminate human error and guarantee safe, controlled operating sequences.

We design tailored trapped-key interlock systems that:

• control access and mechanical sequences
• prevent unsafe operations
• support LOTO and maintenance procedures
• fit seamlessly into each facility’s requirements

We provide a complete engineering service—from concept and analysis to system design, documentation, and implementation support.

KLS Europe delivers advanced key-based safety systems that meet modern functional safety standards, ensuring safe and consistent operation in demanding industrial environments.

Trapped key interlocking is one of the most effective ways to eliminate hazards and enforce safe operating sequences, ensuring controlled machine operation every time.