三さん路ろスイッチ

noun

three-way switch (US); two-way switch (UK)

Electrical switch that controls a light from two locations. In Japanese wiring terminology, 三路スイッチ corresponds to a three-way switch in US English and a two-way switch in UK English. Compare with 片切スイッチ (single-pole switch) and ４路スイッチ (four-way/intermediate switch).

See also: 片切スイッチ (かたぎりスイッチ) · ４路スイッチ (よんろスイッチ)

• 階かい段だんの上うえと下したに三さん路ろスイッチを付つけると便べん利りです。

  It's convenient to install three-way switches at the top and bottom of the stairs.