A four-way switch is installed between two three-way switches, allowing one lighting circuit to be controlled from three or more locations. The three-way switches connect to the power source and light, while the four-way switch changes the connection between traveler wires when toggled.

When adding a four-way switch, confirm that the existing circuit has three-way switches at both ends and install the four-way switch between them using the two traveler pairs, rather than placing it at the line or load end. Turn off power, verify the circuit, follow the wiring diagram, and confirm that the switch, box, conductors, and circuit rating support the application, including 120V to 277V installations where applicable.

Compare the switch’s voltage rating with the circuit voltage, such as the 120V to 277V range supported by these four-way switches, and check the current rating, which is 15A for the listed options. For motor applications, confirm that the switch supports motor loads, while lighting installations should match the switch’s intended general-purpose load and four-way wiring configuration.

Consider a large paddle-style four-way switch for straightforward control of lights or motor loads, and choose a version with a soft locator nightlight when users need help finding the control in low light. Check the project voltage requirements, then select a gloss or satin finish in a color that coordinates with the wallplate, noting that the locator light shows more clearly on lighter colors.