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

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
Part NumberPart Description
M-HD-C-11Handle Interlock with Chain Dual Key – 1 Key Trapped, 1 Key Released – Die Cast

Key sold separately

Technical Data
MaterialDie-Cast Metal with Stainless Steel Chain
Operating Temperature-25 ... +60 °C
Holding Force4000N. (F1max.) 3076N. (Fzh)
Mechanical Life (B10d)1,000,000 cycles