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Duplex Switches

A duplex switch contains two switches on one body. They come in single pole and 3-way. Two of the common terminals are connected together with a removable metal tab. These terminals are usually connected to line voltage and can be black or bronze color depending on the manufacturer. This tab is removed to isolate the tabs from each other.

Duplex switches can replace a single switch without expanding the switch box. They can be used for ceiling fans where one switch controls the fan and the other switch controls the light kit.

Single Pole Duplex Switches

A single pole duplex switch contains two single pole switches.

Single Pole Duplex Switch Diagrams

Metal tab connects line voltage together

Duplex Switch Wiring Diagram 1 Single Pole Duplex Switch Arrow left

Common terminals black or bronze color

Single Pole Duplex Switch No Tab

Metal tab removed to isolate common terminals

Duplex Switch Wiring Diagram 2

Duplex switch common terminals connect to one line

Duplex switch each common terminal connect to a different line

Arrow left down Arrow right down Arrow right down
Arrow left up Ceiling Fan Duplex Switch Wiring Diagram

Ceiling fan diagram using duplex switch

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Electrical Switches

Light Switch Wiring

Multiple Switch Wiring

Multiple Switch Wiring 3-way and Single Pole

Duplex Switches

3-Way Switches

3-Way Switch Wiring

Alternate 3-Way Switch Wiring

3-Way Duplex Switches

4-Way Switches

4-Way Switch Wiring

Alternate 4-Way Switch Wiring

Dimmer Switches

Dimmer Switch Wiring

Photocells and Timers

Ceiling Fan Switch Wiring

Motion Detectors and Occupancy Sensors