Ark•Gard® ENR Premier Series (M4) Explosionproof Receptacles

ENR (M4) Receptacles are used:

  • In applications that require additional environmental protection
  • In areas made hazardous by the presence of flammable vapors and gases or combustible dusts
  • With portable or fixed electrical equipment such as motor generator units, welders, pumps, compressors, heating and cooling units, cellular relay stations, conveyors, lighting systems, and similar equipment
  • When power requirements do not exceed 20 amperes
Amperages 15 or 20A
Voltages 125 or 250V, 50-400 Hz
Types Dead end or through feed
Hub Sizes 1/2"; 3/4"; 1"
Housing Material Die cast copper-free aluminum
Interior Material Krydon® fiberglass-reinforced polyester
Contact Materials Receptacle blade - brass; Receptacle switch - silver
Gasket Material Neoprene


  • Ark•Gard® 2 receptacle incorporates three spring-loaded slide keys that prevent the receptacle face plate from being rotated until the ENP plug is fully inserted into the receptacle; to make the connection, the ENP plug is fully inserted, and the receptacle face moved inward by pushing the plug forward; the plug is then rotated, closing the circuit; as rotation begins, the plug becomes locked in the receptacle and cannot be accidentally disengaged; in making or breaking the circuit, any resulting electrical arc is confined in the factory sealed chamber
  • Factory sealed chamber encloses the potential arcing components between two explosionproof threaded joints; these threads are specially coated to guarantee freedom of movement, which ensures on-off action; no additional seals are required
  • Gasketed screw cap cover design offers superior protection from harsh environments for increased product life
  • Protected hinged cover design provides 360° protection around cover hinge to reduce damage from dirt and corrosion
  • Saddle clamp terminals reduce installation and maintenance costs with easy to wire, time-saving terminals
  • Lockout/tagout hole complies with OSHA lockout/tagout requirements