Low power consumption relays

[soonguy]

Dear wise people

I wish to make a power failure alert on the radial mains circuit that powers our freezer in its own shed. Our old distrution system had a single house-wide trip, so that we'd know if the power was off to the freezer. Our new distribution unit of course has individual trips, so it would be perfectly possible not to notice the freezer shed had tripped out, many hours or worse. I therefore intend to make a noticeable alarm with lamp and probably buzzer alarm, to come on if there was a trip, using a 240v relay. (Lamp and buzzer would represent a very low load on the relay.) I notice that so many relay coils have quite a power usage. As so many household things are already needing necessary standby consumption, a really economical relay seems a good thing to use for something that is on all the time. The most economical relay I could find, at only 50mw is this one from Radio Spares. But they only come in packs of 10. Please would anyone know of how to buy a single one of this type, or something of comparable power usage? Many thanks.

 

[soonguy]

Wonderful, thanks so much for your wisdom and time Robert. I'm very grateful.

 

[Tony Stewart]

The bridge diodes prevent more than ~1.2 - 1.4V reverse on the opto LED.

I agree they block reverse current. I was thinking of worst case flashover.

 

[ZipZapOuch]

Dear wise people

I think you over estimate us.

 

[Tony Stewart]

Yah if we were wiser, you'd be sending us beer. or better.