The ACCEPTOR® UGP-QW / UGR-QW Plug and Receptacle system, with its unique patented design, is interchangeable with other NEMA bladed type explosion-proof and dust ignition proof devices. Plugs and receptacles may be used where bladed devices are needed in locations made hazardous by the presence of flammable gases or vapors, combustible dusts or easily ignitable fibers and flyings.