Rotary AC AIR Conditioning 3 Speed Blower Switch NEW,,AIR CONDITIONING Universal Use, Rotary 3 Speed Blower Switch WITH Plastic 'FAN' Knob Has 5 Spade Terminals And A 1/4" 'D' Shaft For The Knob.Threaded Shaft Length Approx. 3/8" (Body is Approx. 1" X 1" Square, Threaded Shaft Diameter Is 7/16" ) The 'H' , 'M' and 'L' terminals are for fan speed leads..The 'B' terminal is the power 'in' terminal, while the 'C' terminal is for the clutch,thermostat, trinary or binary switch depending on application. There is NOT a ground terminal on the switch. The motor and /or switches are normally internally or externally grounded. Has Off/ Low/Med/High Positions, , 12 VOLT, 25 Amp