Explosion-Proof Tumbler Switch, Type Feed Through, Constructional Feature Explosion-Proof, Dust-Ignitionproof, Voltage Rating 120 to 277 VAC, Current Rating 20 Ampere, Contact Configuration 1-Pole, Operator Type Front Operated Lever, Box Type Double Gang, Hub Size 3/4 Inch, Enclosure Material ASTM A47-77 Zinc Electroplated Chromate Epoxy Powder Coated Malleable Iron, Actuator Material Nylon 6/6, Enclosure Class I Div 1 and 2 Group C D, Class II Div 1 and 2 Group E F G, Class III, NEMA 7CD/9EFG, Approval UL 894/1203, Application Designed to Prevent Arcing of Enclosed Switches in Ignitable Atmospheres During Connect and Disconnect Operation of Lighting and Light Power Loads, Use in Classified Areas Where Ignitable Vapors, Gases or Highly Combustible Dusts are Present, Installation in Chemical Plants, Petrochemical Plants, Refineries, Other Process Industries