Control

Timer Switch

A switch that works to a clock instead of a finger — outdoor lighting that goes off on its own.

Real part — tap a marker

Timer Switch

A switch that works to a clock instead of a finger — outdoor lighting that goes off on its own.

Terminals

L — permanent live to power the timer
N — neutral, needed by the electronics or the clock motor
Load — switched live out to the lamp
Earth — plate earth on metal plates

Faceplate — usually a deeper plate than a plain switch
Dial or digital display — the programme you set
Override / boost button — forces the output on for the rest of the set period
Selector — ON / AUTO / OFF on mechanical timers
Rear terminals, including the neutral the electronics need

Cutaway of a timer switch showing the timer electronics, output relay, backup cell, dial cam and rear terminals

Cutaway — tap a marker

⚡ Meet it in a circuit

Terms used here

Defined in the glossary — each one opens at its own entry.

⚠ Safety note

A timer needs a neutral, so it will not replace a plain switch on a two-plate lighting circuit without a new cable. Outdoor lighting must be RCD-protected, and the enclosure and fittings need an IP rating that suits the location.

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