Buyers Products 50 Amp Rotary Switch is easy to use and controls winding and unwinding the tarp on your dump body or trailer. Its momentary ON-OFF-ON function is controlled by a lever-type, "crow's foot" actuator that comes with an aluminum name plate featuring UNWIND-WIND directions. The switch is built tough to last long. The zinc-plated case features four screw terminals with silver laminated contacts.