Killark B7NFD21A - Compact size enclosures provide application flexibility with cost savings over industry standard sizes.Few cover bolts reduces installation and maintenance time.Gasketed flange with O-ring located inside bolt circule to seal out moisture.Rotary handle style operating mechanism with lockout provision as standard.Removable ductile mounting lugs adjust to irregular mounting surfaces.Bodies have top and bottom drilled and taped conduit entrances for power connections, with custom openings available.ABB UL98 certified switch supplied for 600VAC, 30, 60 & 100 Amp unit available.ABB UL508 certified switch supplied for 600VAC, 16, 32, 40, 63 & 80 Amp unit available.Enclosures - Copper-free cast aluminum (less than 4/10 of 1% copper content).Cover bolts 316 Stainless Steel.Silicone O-ring gasket.Gray powder polyester painted exterior, electrostatically applied. Killark B7NFD Series of Hazardous Location Non-Fused Disconnect Switches provide local means of disconnect of service entrance, feeder or branch circuits, lighting, heating, appliance and motor circuits. Rated for indoor and outdoor applications, the copper-free aluminum construction is ideal for harsh and hazardous environments. - The PRISM B7 Series of non-fused disconnect switches are used: in locations made hazardous due to the presence of flammable gasses or vapors or ignitable dusts, fibers, and flyings outdoors or indoors in damp, wet, and dirty locations in areas where frequent washdowns, heavy rain, or water spray routinely occurs.