The K-SS-Ex Explosion-Proof Tongue Operated Safety Interlock Switch (Part Number: 208016HFH - Model: K-SS-Ex 1NC 1NO 3M HFH) manufactured by world-renowned IDEM Safety Switches Ltd (United Kingdom) is designed to provide robust guard monitoring in hazardous industrial environments certified to ATEX and IECEx directives for Zone 1, Zone 2 (Gas) and Zone 21, Zone 22 (Dust).

PRODUCT SPECIFICATIONS & FEATURES (PART NO: 208016HFH):
- Part Number: 208016HFH
- Product Model: K-SS-Ex 1NC 1NO 3M HFH
- Contact Block: 1 Normally Closed positive break safety contact (1NC) and 1 Normally Open auxiliary monitoring contact (1NO).
- Pre-Wired Cable: Integral 3-meter (3M) high-specification flameproof and oil-resistant pre-wired flying lead.
- Actuator Configuration: Supplied complete with the Heavy Duty Flexible Actuator (HFH) cast in stainless steel. The integrated articulation spring allows self-alignment for misaligned or sagging guard doors, completely preventing tongue breakage and mechanical binding.
- Premium Material Construction: Enclosure body, lid, and rotating head are cast in mirror-polished solid 316 Stainless Steel (Ra < 0.8 µm surface roughness), providing absolute resistance to aggressive cleaning chemicals, acids, and offshore saline corrosion.

KEY ADVANTAGES:
- Hermetically Sealed Explosion-Proof Chamber: Internal contact block is fully flameproof and encapsulated, ensuring internal switching arcs cannot ignite surrounding explosive gases or airborne dusts.
- Rotatable Actuator Head: The 316 stainless steel operating head can be rotated in 4 positions (90-degree increments), offering maximum mounting flexibility for various door profiles.
- IP67 and IP69K Ingress Protection: Dust-tight, fully submersible, and engineered to withstand intense high-pressure hot water washdowns at 80°C and 100 bar.
- Maximum Functional Safety: Conforms to Category 4 / PLe (ISO 13849-1) and SIL 3 (IEC 62061) when integrated with IDEM VIPER SCR Safety Relays.

• Manufacturer: IDEM Safety Switches Ltd
• Origin: United Kingdom
• Part Number: 208016HFH
• Product Model: K-SS-Ex 1NC 1NO 3M HFH
• Operating Principle: Explosion-Proof Tongue Operated Safety Interlock Switch
• Hazardous Area Certifications: ATEX / IECEx Certified
  - Gas Zones: Ex db IIC T6 Gb (Zone 1, Zone 2)
  - Dust Zones: Ex tb IIIC T85°C Db (Zone 21, Zone 22)
• Applicable Standards: ISO 14119, IEC 60947-5-1, EN 60079-0, EN 60079-1, EN 60079-31, ISO 13849-1, IEC 62061
• Safety Ratings: Category 4, PLe (ISO 13849-1), SIL 3 (IEC 62061)
• Contact Configuration: 1NC (Positive Break Safety Contact) + 1NO (Auxiliary Contact)
• Contact Electrical Rating: 250V AC / 4A
• Connection Type: Pre-wired integral 3-meter flying lead cable (3M)
• Included Actuator: Heavy Duty Flexible Actuator (HFH) in Stainless Steel 316
• Mechanical Holding Force: Fmax approx. 2000 N
• Head Positions: 4 rotatable key entry positions
• Housing & Head Material: Solid 316 Stainless Steel (Mirror polished finish)
• Ingress Protection Rating: IP67 and IP69K (Submersible and high-pressure steam washdown proof)
• Operating Ambient Temperature: -20°C to +60°C (Surface Temperature Class T6)
• Mechanical Endurance: > 1,000,000 operating cycles
• Typical Applications: Chemical mixing reactors, paint spraying booths, solvent dispensing kiosks, dairy and pharmaceutical processing lines, grain storage silos, and offshore petrochemical refineries.