World’s smallest 6-contact guard lock safety door switch

  • Key holding force of 1,300 N. 
  • Slide key prevents entrapment
  • Removable terminal block for easy wiring
  • Metal operation head for durability


  • Wiring time is reduced with two types of wiring methods capable of one-touch attachment and removal.
  • A wide variety of built-in switches can be used for various devices. (4-, 5-, and 6-contact models are available) 
  • Key holding force of 1,300 N. 
  • It is possible to change the key insertion point without detaching the head. 
  • Drive solenoids directly from the Controller.

Slide Key

D4SL-N Slide Key.jpg

Trapped key allows the handle to be locked in the open position; prevents entrapment inside

  • Lockout Key to prevent workers from becoming trapped inside the hazardous area.
  • The vertical D4SL Guard Lock Safety-door Switch can be easily mounted on 40 x 40 mm aluminum frames.
  • The plastic material makes the Key suitable for lightweight doors.

Removable Terminal Block

D4SL-N Removable Terminal Block.jpg
Easier to wire and allows for quick maintenance if the switch is damaged and needs replacing.

Metal Operation Head

D4SL-N metal Operation Head.jpg
Improved durability with optional metal operation head; fixed head design eliminates the leading cause of unintended failure with removal, replacement or loose operating head.

Door Switch Features



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