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

Explosion Proof Tongue Interlock Safety Switch (KM-EX)

The KM-EX is a tongue operated safety interlock, suitable for use in hazardous environments. They mount directly to the leading edge of sliding, hinged, or lift off machine guards and feature IDEM’s reliable anti-tamper cam system.


  • Body Material: Red Painted Die Cast Metal / Optional Stainless Steel Head
  • Ingress Protection: IP67
  • Contacts: 2-Pole or 4-Pole Ex Rated Contact Blocks
  • Zones: 1, 21, 2, 22
  • Ex Marking: Exd IIC T6 (-20 ≤ Ta ≤ +60C) Gb / Ex tb IIIC T85C (-20 ≤ Ta ≤ +60C) Db
Part Number Part Description
203016 KM-Ex 3M ‘1NC 1NO’
203016-SS KM-Ex 3M ‘1NC 1NO’ SS Head
203016A KM-Ex 3M ‘1NC 1NO’ – Std Actuator
203016A-SS KM-Ex 3M ‘1NC 1NO’ SS Head – Std Actuator
203016F KM-Ex 3M ‘1NC 1NO’ – flat actuator
203016F-SS KM-Ex 3M ‘1NC 1NO’ SS Head – flat Actuator
203016HF KM-Ex 3M ‘1NC 1NO’ – HF Flexible Actuator
203016HF-SS KM-Ex 3M ‘1NC 1NO’ SS Head – HF Actuator
203016HFH KM-Ex 3M ‘1NC 1NO’ – HFH Flexible Actuator
203016HFH-SS KM-Ex 3M ‘1NC 1NO’ SS Head – HFH Flexible Actuator
203016PF KM-Ex 3M ‘1NC 1NO’ – PF actuator
203016PF-SS KM-Ex 3M ‘1NC 1NO’ SS Head – PF Actuator
203019 KM-Ex 3M ‘2NC’
203019-SS KM-Ex 3M ‘2NC’ SS Head
203019A KM-Ex 3M ‘2NC’ – std actuator
203019A-SS KM-Ex 3M ‘2NC’ SS Head – Std Actuator
203019F KM-Ex 3M ‘2NC’ – flat actuator
203019F-SS KM-Ex 3M ‘2NC’ SS Head – flat Actuator
203019HF KM-Ex 3M ‘2NC’ – HF Flexible Actuator
203019HF-SS KM-Ex 3M ‘2NC’ SS Head – HF Actuator
203019HFH KM-Ex 3M ‘2NC’ – HFH Flexible Actuator
203019HFH-SS KM-Ex 3M ‘2NC’ SS Head – HFH Flexible Actuator
203019PF KM-Ex 3M ‘2NC’ – PF actuator
203019PF-SS KM-Ex 3M ‘2NC’ SS Head – PF Actuator
203026 KM-Ex 3M ‘2NC 2NO’
203026-SS KM-Ex 3M ‘2NC 2NO’ SS Head
203026A KM-Ex 3M ‘2NC 2NO’ – std actuator
203026A-SS KM-Ex 3M ‘2NC 2NO’ SS Head – Std Actuator
203026F KM-Ex 3M ‘2NC 2NO’ – flat actuator
203026F-SS KM-Ex 3M ‘2NC 2NO’ SS Head – flat Actuator
203026HF KM-Ex 3M ‘2NC 2NO’ – HF Flexible Actuator
203026HF-SS KM-Ex 3M ‘2NC 2NO’ SS Head – HF Actuator
203026HFH KM-Ex 3M ‘2NC 2NO’ – HFH Flexible Actuator
203026HFH-SS KM-Ex 3M ‘2NC 2NO’ SS Head – HFH Flexible Actuator
203026PF KM-Ex 3M ‘2NC 2NO’ – PF actuator
203026PF-SS KM-Ex 3M ‘2NC 2NO’ SS Head – PF Actuator

Important Note
Comes with 3m of pre-wired cable (longer available on request).
Actuator sold separately.

Technical Data
ApprovalsIECEx, cULus on LS-Ex Internal Contact Block
TechnologyTongue Interlock (Non Locking)
Housing MaterialPainted Die-Cast Aluminum
Head MaterialPainted Die-Cast Aluminum or 316 Grade Stainless Steel
Actuator Travel/Force for Positive Opening6mm/12N
Actuator Entry Minimum Radius175mm Standard 100mm Flexible
Maximum Approach Withdrawal Speed 600mm/s
Enclosure ProtectionIP67
Operating Temperature-25 ... +80 °C
Switching frequency (LS-Ex)1.0 Hz maximum
Mechanical Life Expectancy (LS-Ex)1,000,000 switches
Electrical Life Expectancy (LS-Ex)Tested to 1,000,000 cycles at 24V. 0.2A

Ex Classification
ATEX Zones 1,21,2,22
II 2G Ex mb IIC T6 Gb
II 2D Ex mb IIIC T80C Db