Mains relay box with dry contact input

how many amps @ 240v ? what is it driving ? What rate of speed does it have to turn on/off at ?

What sort of input contact did you have in mind, can it sit at 240v potential or must it be isolated from the mains ?

"Pete"

Zero current ??

What ever for ?

........ Phil

Usually one 240VAC bell, sometimes two, 80VA or so each. Sometimes, it may be used to switch other devices, like a 240VAC light.

Usually 2 or 3 seconds on, up to 32 times a day, at least one minute between on periods. Sometimes, as short as 0.25 seconds on, sometimes as long as 8 seconds on.

A low voltage relay contact will be used to drive it, and the switching input *must* be isolated from the mains.

Does this help? If you know of something that won't quite meet the specs, please suggest it anyway.

Thanks, Peter

Thanks, Phil. I do realise that the term "dry contact" is not technically correct, but it's often used for the type of device I'm looking for, as well as in many other industries. I am aware that the "official" meaning of the term is that no voltage is applied to the switch while it is actually switching.

So, let's just assume that what I meant was that I need to switch this device on and off with a normally open relay contact. I am not able to provide voltage to the switching device.

Peter

Doesn't sound like you'd want to build a kit, but DSE was selling something like this. There might still be a few around in stores. Have a look at

Bob

"Bob Parker"

The cheap radio link is no way accident safe, interference proof or other user proof.

This may well count it out for the OP's app as well.

....... Phil

I've never used one, and I don't think I ever will ... for the reasons you just gave. But I presume that they have a "C-Tick" on them to give the impression that they're wonderful?

Bob

Our law makers have to BAN certain items as being inherently unsafe to have on sale to the public.

They could start with the current crop of CFLs.

....... Phil