off-delay timer
nounUK /ɒf dɪˈleɪ ˈtaɪmə/
US /ɔf dɪˈleɪ ˈtaɪmər/
A timer that keeps something on for a little while after you turn it off.
The off-delay timer keeps the bathroom fan running for five minutes after the light is switched off.
OTHER MEANINGS
2. A relay setting that postpones the moment a circuit is de-energized.
Set the off-delay timer to two seconds so the motor stops smoothly.
3. A feature in a car that keeps the headlights on briefly after the engine is shut off.
The off-delay timer leaves the headlights on for thirty seconds so you can see the path to the door.
4. A function in a fan or ventilation system that clears remaining air after shutdown.
The off-delay timer on the extractor fan removes leftover steam after cooking.