Eaton Crouse-Hinds® series hazardous area interlocked receptacles prevent engagement and disengagement of the plug under load, providing safe portable power connections and extended product life. Arktite® FSQC explosionproof interlock receptacles are used to supply power to portable electrical equipment such as hand lamps, lighting systems, power tools, conveyors and welders in areas which are hazardous due to the presence of flammable vapors or gases and combustible dusts. Typical applications include petroleum refineries, chemical and petrochemical plants and facilities for processing and handling grain, flour and starch. compatible with Arktite® APJ and NPJ plugs, the FSQC switch cannot be turned on until the plug is fully inserted and rotated. Once turned on, the plug cannot be withdrawn under load and the cover cannot be removed.