Pass & Seymour 20AC4-1 Four Way Switch is a four-way electrical switch from the Pass & Seymour family. It is used in multi-location lighting control systems to enable control of a single lighting circuit from more than one location, commonly positioned between two 3-way switches in a four-way configuration. The 20AC4-1 designation identifies the specific variant within Pass & Seymour’s four‑way switch lineup.
