automatic cut-off
nounUK /ˌɔːtəˈmætɪk ˈkʌtɒf/
US /ˌɔːtəˈmætɪk ˈkʌtɔːf/
A machine part that stops the machine by itself when something goes wrong.
The automatic cut-off turned off the heater before it got too hot.
OTHER MEANINGS
2. A point where something ends by itself without a person doing it.
The automatic cut-off for sign-ups is Friday at noon.
3. A device that stops water or power from flowing when there is a problem.
The automatic cut-off saved the house from flooding.
4. The act of a computer or system stopping a process on its own.
The automatic cut-off ended the game after ten minutes.