The EXT-401 Explosion Proof Telephone provides safe and reliable communications for Class I Division 1 and Class II Division 1 areas deemed to be hazardous due to the presence of flammable gasses, vapors, dust or fibers.

Standards Compliance

CSA 1514630 (LR 65547)

Class I, Division 1, Groups B, C and D;
Class II, Division 1 and 2, Groups E, F and G
CSA C22.2 No. 30 – M1986 Explosion-Proof Enclosures for Use in Class I Hazardous Locations
C22.2 No. 157 – 1992 – Intrinsically Safe Equipment for use in Class I Hazardous Locations
CLASS 4818 02 – SIGNAL APPLIANCES – Audible – For Hazardous Locations
CSA Certificate 1514630 (LR 65547)

Industry Canada – 1012 4339 A

Hearing-aid Compatible Equipment
Registration – 1012 4339 A

UL WZAT.E117495

Class I, Groups B, C and D;
Class II, Groups E, F and G.

Telephones, Models 401UH301A, U301A, UH301B. Explosion-proof, provides intrinsically safe outputs when connected to Handset Part Nos. 301SC or , 301SCPB or Headset Model No. ISH1125.
UL Certificate WZAT.E117495

Part Nos. 301SC, 301SCPB Handset and Model No. ISH1125 Headset, Intrinsically safe when connected to Models 401UH301A, UH301B, U301A,
explosion proof telephones.

UL Certificate WZAT.E117495

Product Features

  • Over sized buttons for gloves-on operation
  • Corrosion and moisture resistant circuitry
  • Intrinsically safe handset with heavy duty cord
  • Field replaceable handset and fuse
  • Explosion proof, no isolation barrier required
  • Copper-free cast aluminum housing
  • Temperature range -40°C to +60°C (-40°F to +140°F)
  • Select Models (see data sheet for full line)
  • P4011 Basic Telephone (base model)
  • P4021 Ring Detect Relay (RDR)
  • P4031 Volume Control / Ring Detect Relay
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