Type FN Interlock

Type FN Interlock

Isolation interlock

KIRK® Type FN interlock is a key operated mechanical interlock that is suitable for the control of electrical switchgear. The standard unit comes with a stainless steel 5/8” diameter locking bolt with a throw or travel of 3/4”. The locking bolt is used to control the rotation or movement of operating handles or toggles of electrical switchgear. Many suppliers of switchgear equipment have mounting provisions available for KIRK® interlocks.

The Type FN interlock is available in both SD and HD series.

For further technical information please refer to the datasheet.


  • Key actuated lock bolt
  • Single or multiple cylinders available
  • Protective covers available
  • Tamperproof mounting bolts optional
  • Available in SD (brass) or HD Series (316 stainless steel)

Type FN Interlock Data Sheet