active alarm without power consumption?

Is it possible to have a setup where you have an alarm and once you break a wire, the alarm instantly goes off, yet when the wire is connected it doesn't consume any power from the battery. Hopefully you can understand what I'm trying to describe. Thanks :)

They do make Back-Up battery sirens.  They do what you are wanting it to do.  But it does draw a little current from the battery.Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Current draw on a battery back-up siren is negligable. And why not tell us what vehicle or alarm yu have or are considering, it might just be relevant.

Negligible yes, but zero power consumption not really, since everything needs power to work. If you simply use a transistor that's kept off by your monitoring wire keeping the input grounded, you could have it switch turn on when the wire's broken. The input gets pulled up high, and the transistor turns on your siren. The small amount of pullup current is the power that would be needed in standby, but it would only be 12 microamps if you used a 1M ohm pullup. Definitely negligible, but technically not zero.

regardeless to how you do it .it will take some powerboxead78