Explosionproof, dust-ignitionproof, ideal for installation in chemical and petrochemical plants, refineries and other process industries|Factory sealed switches are designed to a UL standard so that any arcing devices are contained within an explosionproof Labyrinth switch (standard switch and sealing chamber on select models)|Tumbler switch devices are approved for installation without additional external sealing fittings|Smooth double-face, accurately ground surfaces on sealing chamber flange mate with cover and body to provide positive flame-tight construction|1/2 and 3/4 in 1-gang units suitable for class I, group B, in addition to class I, groups C and D, class II, groups E, F and G and class III|Sealing chamber has prewired factory sealed pigtail leads to switch|Enclosures have external mounting lugs for ease of mounting|Smooth rounded integral bushing in each hub protects conductor insulation|Corrosion resistant strong stainless steel hex head cap screws attach cover/body/sealing chamber assembly for approved flame-tight construction|Threaded stainless steel operating handle provides positive corrosion resistant operation|Choice of front-operating handle may be locked in ON/OFF position|Nylon 6/6 actuator|Aluminum backbox and cover|Designed to prevent arcing of enclosed switches in ignitable atmospheres during connect and disconnect operation of lighting and light power loads|For installation in chemical plants, petrochemical plants, refineries and other process industries|Triple coat finish (1) electro-zinc plated, (2) polished chrome, (3) epoxy powder coated