Choosing the Right Light Switch for Your Project

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Single-Pole Switch

Controls power to lights and devices by turning off the hot side of the circuit.
Mounted in an electrical box.
Has two brass terminal screws.
Controls current from one circuit from one point.

Double-Pole Switch
Controls power to lights and devices by turning off the hot side of the circuit.
Mounted in an electrical box.
Has four brass terminal screws

Three-Way Switch
Controls power to lights and devices by turning off the hot side of the circuit.
Mounted in an electrical box.
Has three brass terminal screws.
Controls one circuit from two separate points. For example, a light that can be turned on in either the house or garage. It may also include a green grounding screw.

Four-Way Switch
Controls power to lights and devices by turning off the hot side of the circuit.
Mounted in an electrical box.
Has four brass terminal screws.
It may also include a green grounding screw.
Used in connection with three-way switches to control one circuit from three or more points.

Specialty Switches
A Rocker Switch operates the same as a standard switch, but instead of a toggle, it operates with a rocker action.
A Delayed Action Switch keeps the circuit open for a few minutesafter the switch is turned off. A good use is in a garage where, after the user turns off the switch, it allows the light to remain on in time exit.
A Photoelectric Switch operates with a photoelectric cell. It turns off during the day and turns on during the night.
A Motion Switch turns on the light as you enter the room. Good for both convenience and security.
An Illuminated Switch has a small light that is on when the switch is off so it can be easily found; these are usually used at entrances to rooms and in hallways. Another version is the Pilot Light Switch.
An Outdoor Switch features a turning lever inside a weatherproof box cover with a toggle switch.
A Voice-Activated Switch operates with a voice command

Dimmer Switch
Controls the amount of current in a light circuit and allows for varying levels of light.
Usually may be installed in place of standard switches.
They are available in a variety of types, including rotary, toggle and slide.
Dimmers may also interfere with radios and TVs and cause the light bulb to hum. Some dimmers are manufactured with a filter that eases this problem.

Line Switch
Used to interrupt the flow of electricity on cords, most often for lamps and appliances.
A variety of styles are available, and they can operate with a toggle, rotary or push-button action.