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The switch receptacle combo device is set up like a duplex receptacle but has a 15a single pole switch in one half and a single 15a 125v receptacle in the other half they can work in conjunction with one another or they can be connected and used independent of each other. The difference between a single and double pole switch is that the latter controls two circuits at the same time a double pole switch is what you need to control a 240 volt device because 240 volt circuits have two hot wires it has four terminals two for incoming hots and two for outgoing hots. Learn how to wire a single pole switch with 9 different single pole switch wiring methods including switch fed light fed half switched receptacles and combination switches an instructors aid and electricians guide to residential switch wiring methods used throughout the us make copies for classroom instruction or individual use. Single pole switches are the most common light switches in a home they have two screw terminals plus a ground screw one screw terminal is for the hot wire that feeds the switch from the power source the other terminal is for a second hot wire called a switch leg that runs only between the switch and the light fixture