Leading Manufacturer of Safety Interlock Switches and Machine Guard Safety Switch Devices for Automation and Process Safety

Trapped Key Bolt Interlock with Single Key (M-BS)

The M-BS Trapped Key Interlock operates by using a locking bolt mechanism, which is extended when the key is removed. Inserting and turning the appropriate key retracts the bolt, allowing access to the hazardous area.


  • Material: Mirror Polished Die-Cast Metal
  • Holding Force: F1Max 5000N
Part Number Part Description
M-BS Bolt Interlock Single Key – Key Trapped – Bolt Retracted – Die Cast

Important Note
It is important that when the bolt is retracted, it is held captive until the guard is closed. If you can extend the bolt whilst the guard is open, you are at risk of serious harm.
Key sold separately

Technical Data
MaterialDie-Cast Metal
Operating Temperature -25 ... +60 °C
Holding Force5000N. (F1max.) 3846N. (Fzh)
Mechanical Life (B10d)1,000,000 cycles