three-way switch
Noun: An electrical switch designed with three terminals for connection to wires. Its primary function is to allow control of a single electrical load (like a light fixture) from two separate locations.
This term is used specifically in the context of electrical wiring and hardware. It describes a physical component installed in standard wall boxes. * You need to install a three-way switch at the top and bottom of the stairs to control the same light. * The electrician replaced the old, faulty switch with a new three-way switch.
In technical diagrams and electrician parlance, the term specifies the switch's internal mechanism and wiring configuration (using a "common" terminal and two "traveler" terminals), distinguishing it from a standard single-pole switch. * The circuit diagram clearly shows how to connect the three-way switch using the traveler wires.
- Three-way (adjective): Used to describe the type of switch or the circuit.
- We need to buy a three-way switch kit.
- This is a three-way lighting circuit.
- Four-way switch (noun): A related device used in conjunction with three-way switches to control a load from three or more locations.
- Two-location switch: A descriptive synonym emphasizing its function.
- (In technical contexts) SPDT switch: An acronym for "Single Pole, Double Throw," describing the electrical operation of the switch mechanism.
The "three-way" refers to the three electrical terminals on the switch, not to having three possible switch positions (it has two: up and down). The "way" indicates the number of different paths the electrical current can take when the switch is toggled.
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an electric switch that has three terminals; used to control a circuit from two different locations
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