Killark B7NFD2-RPH - 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.