Since I've been looking at goodness knows how many connectors over the
last week, I have started to notice different ratings for AC and DC.
With capacitors one actual factory - in this instance LCR - informed me
that the ratio is about 1.4 to I so 250v becomes about 350vDC.
Presumably they've tested their products. But connectors seem to be a
different story - less than 1.4. I've seen things like 200vAC, 250DC.

It occurs to me that many of the connectors seem to quote 250vAC
because that's mains voltage. Must be some standardised coding. I
suspect many are capable of much more - e.g. Speakons - but just don't
bother to quote a higher voltage which they don't expect their product
to be used at.

Amphenol does seem to quote a voltage which is more in keeping with the
product, and I guess that "power" rather than mains connectors need to
be more specific, since all kinds of industrial and military voltages
may be required.

I did also come across some cheap and very useful connectors in the D
range - quoted for 750vDC. these have bugger pins than usual, and can
be bought either big pins only (three, eight) or mixtures of big and
regular pins. Made by Harting and can be found in the Farnell
catalogue. This looks particularly useful - cheap too.
http://uk.farnell.com/jsp/endecaSear...sp?SKU=1207587