I'm looking for small quantities (usually less than ten a year) of a pre-built and type-approved box of tricks that will take a dry contact input and switch on or off a standard 240v mains output socket.
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, 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.
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?
** Like with the Arlec (and Jaycar ) 120 volt auto-transformers - the safety issues cannot be discovered by simply looking at the product itself. Which is all an inspections lab is required to do.
Our law makers have to BAN certain items as being inherently unsafe to have on sale to the public.
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