noun
intermediate switch; crossover switch; four-way switch
Electrical wiring component used with two 3-way switches to control a light from three or more locations. UK term: intermediate/crossover switch; US term: four-way switch.
See also: 片切スイッチ (かたぎりスイッチ) · ３路スイッチ (さんろスイッチ)
この階段の照明は、３路スイッチと４路スイッチで制御されています。
The staircase lighting is controlled by 3-way and 4-way switches.
４路スイッチの配線方法を教えてください。
Please tell me how to wire a four-way switch.
A 3-way switch used in pairs; a 4路スイッチ is added between them to allow control from additional points.
A simple on/off toggle switch; 4路スイッチ is a specialized multi-location switch.
Compound of 四 (four) + 路 (path/way) + スイッチ (switch), referring to the four terminals of the switch.