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

Trapped Key Mechanical Isolation of Switchgear (Die-Cast)

Mechanical Isolation of Switchgear such as bolt interlocks offer a form of isolation for electrical switchgear to prevent the return of hazardous electrical energy.

M-BS and M-BD interlocks can be used to prevent access to control panels before the switchgear has been isolated. When the key or keys are inserted, they become “trapped” in the lock, preventing the switchgear from being energized until the key is released. This ensures that power isolation procedures are followed before access to the switchgear is granted.

For gate interlocking applications, 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.

  • Suitable for Harsh Environmental Conditions
  • Cost Effective Solution
  • Easy to Install and Maintain
  • Improves Power Isolation Procedures

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

    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. Alternatively, the M-BS can be used for power interlocking on switchgear, directly interfering with the cam. When the key is inserted, it becomes “trapped” in the lock, preventing the switchgear from being energized until the key is released

    • Manufactured from Mirror Polished Die-Cast Metal
    • Holding Force up to F1Max 5000N
    Go to Product : Trapped Key Bolt Interlock with Single Key (M-BS)

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

    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
    Go to Product : Trapped Key Bolt Interlock with Dual Key (M-BD)