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

Trapped Key Interlocks for Access Control with Dual Key (Die-Cast)

Trapped key interlocks with dual key ensure that a guard door is locked closed under normal operating conditions. Once the first key is inserted, a second key can be released (also known as a personnel key). The operator can take this key into the hazardous area to minimize the possibility of inadvertent start-up occurring. The first key remains trapped until the second key is returned.

Access control in on a trapped key system refers to a method for controlling access to hazardous areas of machines and equipment. It involves granting users the ability to gain access to the hazardous area, either in full or in part, using access control interlocks. These interlocks are designed to ensure that a guard or door is locked in a closed position under normal operating conditions and can only be operated when a coded key is inserted and turned, thereby enabling access to the machine.

Trapped Key Interlocks are widely used in various industrial settings to safeguard workers and prevent accidents. It is a highly effective method for ensuring that safety protocols are strictly adhered to and that access to hazardous areas is only granted to authorized personnel. Furthermore, the process can be customized to suit different requirements, making it a versatile and flexible safety solution.

  • Robust Design Suitable for Harsh Environments
  • Large Range of Products for Different Guard Door Types
  • No Wiring Required for Easy Installation and Maintenance
  • Spring Handle Options for Misaligned Guard Doors

  • 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)

  • Trapped Key Spring Handle Interlock with Dual Key (M-HD-11)

    Trapped Key Spring Handle Interlock with Dual Key (M-HD-11)

    The M-HD-11 Trapped Key Interlock operates by using a spring loaded handle lock mechanism, which is locked when the first key is removed. Inserting and turning the appropriate key allows the secondary key to be released, unlocking the handle and allowing access to the hazardous area. The second key (often referred to as the personnel key) should be taken inside the hazardous area to reduce the likelihood of an inadvertent start-up.

    • Manufactured from Die-Cast Metal
    • Holding Force up to F1Max 4000N
    Go to Product : Trapped Key Spring Handle Interlock with Dual Key (M-HD-11)

  • Trapped Key Spring Handle Interlock with Dual Key and Chain (M-HD-11-C)

    Trapped Key Spring Handle Interlock with Dual Key and Chain (M-HD-11-C)

    The M-HD-11-C Trapped Key Interlock operates by using a spring loaded handle lock mechanism, which is locked when the first key is removed. Inserting and turning the appropriate key allows the secondary key to be released, unlocking the handle (which is connected to a chain) and allowing access to the hazardous area. The second key (often referred to as the personnel key) should be taken inside the hazardous area to reduce the likelihood of an inadvertent start-up.

    • Manufactured from Mirror Polished Die-Cast Metal
    • Chain Manufactured from Stainless Steel
    • Holding Force up to F1Max 4000N
    Go to Product : Trapped Key Spring Handle Interlock with Dual Key and Chain (M-HD-11-C)

  • Trapped Key Tongue Interlock with Dual Key (M-TD-11)

    Trapped Key Tongue Interlock with Dual Key (M-TD-11)

    The M-TD-11 Trapped Key Interlock operates by using a tongue locking mechanism, which is locked when the first key is removed. Inserting and turning the appropriate key allows the secondary key to be released, unlocking the tongue and allowing access to the hazardous area. The second key (often referred to as the personnel key) should be taken inside the hazardous area to reduce the likelihood of an inadvertent start-up.

    • Manufactured from Die-Cast Metal
    • Holding Force up to F1Max 3000N
    Go to Product : Trapped Key Tongue Interlock with Dual Key (M-TD-11)

  • Trapped Key Spring Handle Tongue Interlock with Dual Key (M-HT-D-11)

    Trapped Key Spring Handle Tongue Interlock with Dual Key (M-HT-D-11)

    The M-HT-D Trapped Key Interlock operates by using a spring loaded handle lock mechanism, which is locked when the first key is removed. Inserting and turning the appropriate key allows the secondary key to be released, unlocking the handle and allowing access to the hazardous area. The second key (often referred to as the personnel key) should be taken inside the hazardous area to reduce the likelihood of an inadvertent start-up. The M-HT-D interlock features IDEM’s anti-tamper cam system for long term proven reliability.

    • Manufactured from Die-Cast Metal
    • Handle Manufactured from Stainless Steel
    • Holding Force up to F1Max 3000N
    Go to Product : Trapped Key Spring Handle Tongue Interlock with Dual Key (M-HT-D-11)