bczoom said:
When you say a time delay, do I assume correctly that wouldn't be appropriate for an emergency lighting system as you would want the lights to come on immediately?.
If your power just drops upon failure you don't need a delay. If it stutters off and on the relay will drop in and out causing the emergency lights to flash. If you have a delay of a few seconds you will be in the dark for the delay period but it will stay on when it does come up.
An example is the power failure start relay on an automatic transfer panel for a generator. It doesn't kick in immediately it waits for a pre-programmed delay time to make sure the power is really off.
In this case it doesn't make a difference, either way would get you light in the long run.
bczoom said:
Can you elaborate on putting a fuse in there? It's current configuration is the relay is on a breaker in the 110V box.
If there is a failure in the relay coil such as an partial short the coil could overheat and catch fire while only drawing a few amps. A 15 or 20 amp breaker would never know anything was wrong.
The relay is energized 24x7, already hot. It's wise to use a good brand in these cases too. P & B makes good stuff.
Jim