"James Sweet" wrote in message
news:fA3Dd.26413$2X6.14665@trnddc07...

| But it sounds like the 120v coil is used to detect mains failure, power
goes
| out, relay loses power, contacts open/close, triggering the alarm. The
relay
| can be left alone, you only have to mess with the low voltage signal it
| switches.

If he wants to use a cap to delay it the lower power the better. Even a reed
relay will work OK and keep the cap size down. That's the key - run from a
rectifier circuit.

N