Automatic AC shutoff after specified or "hardcoded" time when triggered.

[war]

Good day all. (First post )

Have never had to use/implement this feature before... but am essentially looking for a device that automatically shuts off the outgoing hot line (power) after a specified or hard set amount of time. (Essentially the opposite of a time-delay)

I.e. when trigerred, it will allow power through and when the specified time is reached, it will shut off.

Any help would be much appreciated.

(The application is for a lighting system which will be on a timer but lets assume that a "bypass" switch is used. When the bypass switch is used it would only allow the powered lights to stay on for a max specified time.)

Regards

 

[Sintra]

Use an absence detector connected directly to the lights or via a contactor.

 

[Spoon]

Not sure if this is what you are after but:
Could you not just use a contactor with a NC contact. Use a pushbutton as your "bypass switch" which wires through a timer to the contactor coil. You hit the pushbutton and after a certain amount of time it energises the contactor and opens the NC contact, switching off the light.

A bit more info on where this is going to be used may be helpful.

 

[Deleted member 72666]

| Push Button Timer Switch, 10 s ? 20 min, Surface Mount, 2 Way, 1 Gang 240 V ac 10 A |

 

[a1guvner]

din rail off delay timer is your friend, trigger input starts the timer and switches volt free contacts