Industrial Grade Toggle Switches incorporate the most durable design elements in the industry and are horsepower rated to handle motor loads. Tapered lead-in slots on back wiring holes assist in gathering stranded wires for faster, more secure connections. Automatic grounding system eliminates need for bonding jumper in grounded metal enclosure. Ground screw terminal standard. 0.05 in THK steel mounting strap zinc plated for corrosion resistance. 120/277 VAC rating ideal for fluorescent lighting fixtures typical in commercial applications. Combination slot/Phillips® head mounting and terminal screws ease installation with power screwdrivers (slot/Robertson screws in Canada where available). Tri-combo screws.