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

Trapped Key Bolt Interlock with Dual Key (M-BD)

The M-BD 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, releasing a personnel key and allowing access to the hazardous area. Alternatively, the M-BD can be used for power interlocking on switchgear, directly interfering with the cam. When the key or keys are inserted, they become “trapped” in the lock, preventing the switchgear from being energized until they are released.

  • Manufactured from Mirror Polished Die-Cast Metal
  • Holding Force up to F1Max 5000N
  • BD-11: 1 Key Trapped, 1 Key Free, Bolt Retracted
  • BD-20: 2 Keys Trapped, Bolt Retracted
Part NumberPart Description
M-BD-11Bolt Interlock Dual Key – 1 Key Trapped 1 Key Free – Bolt Retracted – Die Cast
M-BD-20Bolt Interlock Dual Key – 2 Key Trapped 0 Key Free – 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