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

Explosion Proof Tongue Interlock Safety Switch (KM-SS-EX)

The KM-SS-EX is a tongue operated stainless steel 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: Mirror Polished 316 Stainless Steel
  • Ingress Protection: IP69K
  • 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
204016 KM-SS-Ex 3M ‘1NC 1NO’
204016A KM-SS-Ex 3M ‘1NC 1NO’ – std actuator
204016F KM-SS-Ex 3M ‘1NC 1NO’ – flat actuator
204016HF KM-SS-Ex 3M ‘1NC 1NO’ – HF Actuator
204016HFH KM-SS-Ex 3M ‘1NC 1NO’ – HFH Actuator
204016PF KM-SS-Ex 3M ‘1NC 1NO’ – PF actuator
204019 KM-SS-Ex 3M ‘2NC’
204019A KM-SS-Ex 3M ‘2NC’ – std actuator
204019F KM-SS-Ex 3M ‘2NC’ – flat actuator
204019HF KM-SS-Ex 3M ‘2NC’ – HF Actuator
204019HFH KM-SS-Ex 3M ‘2NC’ – HFH Actuator
204019PF KM-SS-Ex 3M ‘2NC’ – PF actuator
204026 KM-SS-Ex 3M ‘2NC 2NO’
204026A KM-SS-Ex 3M ‘2NC 2NO’ – std actuator
204026F KM-SS-Ex 3M ‘2NC 2NO’ – flat actuator
204026HF KM-SS-Ex 3M ‘2NC 2NO’ – HF Actuator
204026HFH KM-SS-Ex 3M ‘2NC 2NO’ – HFH Actuator
204026PF KM-SS-Ex 3M ‘2NC 2NO’ – PF actuator

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

Technical Data
ApprovalsIECEx, cULus on LS-Ex Internal Contact Block
TechnologyTongue Interlock (Non Locking)
Material 316 Grade Stainless Steel
Actuator Travel/Force for Positive Opening6mm/12N
Actuator Entry Minimum Radius175mm Standard 100mm Flexible
Maximum Approach Withdrawal Speed600mm/s
Enclosure ProtectionIP67, IP69K (NEMA 6)
Operating Temperature-25 ... +60 °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