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Our interlock products are customized
to your unique safety needs

Type D Interlock

Access interlock

KIRK® Type D access interlocks provide a physical barrier to either partial or full body access points until risk of hazardous energy or moving equipment has been mitigated.

All Type D interlocks have two parts: a main body with one or more cylinders and a latch block. Proper alignment of both parts is crucial to the operation of a Type D interlock. When the main body is separated from the latch block, the lock bolt is retained in the withdrawn position by concealed latch pins; the key(s) is trapped in the lock whenever the two parts are separated. When the door the Type D is mounted on is closed, the key(s) can be turned to extend the lock bolt into the latch block, securing the door. Only extending the lock bolt, after properly closing the door, should allow release of the key(s).

An exception to this rule is a multiple cylinder Type D interlock which allows release of a “personnel” key when the door is opened. The personnel key can be put in the pocket of the maintenance person ensuring that the door cannot be closed and locked while the released personnel key is on the person.

The Type D is available in both SD and HD series.

For further technical information please refer to the datasheet.


  • Multiple cylinders available
  • Tamperproof mounting bolts optional
  • Key removable when two components are connected
  • Available in SD (brass) and HD (316 Stainless steel)
  • Protective cover available

Typical application

Perimeter guarding

Electrostatic Precipitator

Uninterruptible power supply

Global Headquarters

9048 Meridian Circle NW                North Canton, OH 44720 USA

FAX (330)497-4400