On May 4, 2017 at 09:34, SWOInstaller said...
Omron has many types of 120V coil relays with NO/NC contacts on them. You would need to use the NO so when the coil is powered it closes the relay, and when power has been lost it opens the relay.
The contact info is of primary importance, because if you wire it the other way,
120V relays are generally not silent like DC relays. Almost all models buzz. And you'd have to enclose it and provide UL-approved power connections. A wall wart gives you UL approved power connections and a low-voltage output for a silent (DC) relay that could be mounted in a plastic box if you like.
Go with a wall wart and automotive relay. (I also ran into the automotives, Bosch in particular, and find them incredibly reliable.)
