How to Wire a Double Pole Dimmer Switch | eHow Double-pole refers to a circuit that uses two 120-volt poles to create one 240-volt circuit. A dimmer switch has a special resistor that allows a varying amount of current through in order to provide a variable wattage to the output. It is called a dimmer switch because it is often used in lighting Amazon: double pole dimmer switch Amazon: double pole dimmer switch. [2 Pack] BESTTEN Decorative Rocker Light Dimmer Switch with Horizontal Slider & Side Adjuster for Incandescent or Halogen Bulbs, CFL and LED Dimmable Lamps, Decor Wall Plate Included, UL Listed, White. 4.1 out of 5 stars 55. $25 $ 25. 99.