My suggestion use a latching relay (google search this term). This type of
relay only needs to be pulsed and will hold its last setting. Use the water
alarm to open relay and a push button switch to close it. This way it
should be immune to power failures.

"Tman" tman9_ at _comcast.net (remove underscores) wrote in message
...
Does anyone know of a water alarm that can be rigged so that when tripped,
will shut off a 240VAC well pump?

It would be nice to have one installed in the basement, so that in the
event of a pipe burst, the pump would be off limiting that amount of water
that could get out...

Tman.