EXT-401 Assembly

Guardian’s EXT-401 Explosion Proof Telephone is coupled with our line powered CE20 Explosion Proof Ringer and a Back Plate.

The EXT-401 and CE20 Explosion Proof ringer provide 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.


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)
    • P1011  CE20 Line Powered Ringer/Back Plate
    • P1021  Ring Detect Relay (RDR)/CE20 Line Powered Ringer/Back Plate
    • P4030  Volume Control/CE20 Line Powered Ringer/Back Plate
    • P4032  Volume Control/Ring Detect Relay/CE20 Line Powered Ringer/Back Plate