Kirk Key Interlock Company, LLC

Industrial safety systems

Kirk trapped key interlocking systems are widely used to protect people and equipment.

Kirk Key interlocking safety products

Products and services

  • Mechanical and electromechanical trapped key interlocks
  • Safety access and control systems
  • Valve control


  • Electrical switchgear
  • Power plants
  • Utilities
  • Machine guarding
  • Mining
  • Pulp and paper mills
  • Water treatment plants

The Kirk Key brand is so well-known in the North American industrial community that “Kirk Key” is often used to mean any kind of trapped key interlock, regardless of manufacturer. Its interlock systems are custom-configured to meet each user’s requirements and revolve around a key or keys that an operator must use at each step in the pre-determined sequence.

Kirk maintains end user records dating back to the 1940s, aiding companies that need to add to or repair their older interlock scheme.

The headquarters is in North Canton, Ohio, USA, with a network of sales agents around the world.

Kirk operates within the Halma Process Safety Sector.



Head Office location

Kirk Key, 9048 Meridian Circle NW, North Canton, OH 44720 USA

Tel: +1 234 209 9301