An intermediate switch is used when you have three switches controlling one light;A typical example of this is on a landing;There is a switch at the bottom of the stairs, one at top of the stairs and one at the end of the landing

• Knightsbridge SF1200PB 10 A 1-Gang Screwless Intermediate Switch - Polished Brass
• Polished Brass
• Multi

Knightsbridge SF1200PB 10 A 1-Gang Screwless Intermediate Switch - Polished BrassML Accessories