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The wikipedia page is decent for this
Didn't even think to look for a Wikipedia page! Good shout.
I'd imagine it's latching due to zero crossing logic - your dc voltage isn't going to cross zero even if you go from +V to 0V, and some AC relays will only switch at the zero cross point.
Yes, makes total sense now. No zero cross with DC so no switching happens, but now makes sense why if I manually turn the voltage down to zero it switches off and stays off.
Jonny69
The wikipedia page is decent for this
I'd imagine it's latching due to zero crossing logic - your dc voltage isn't going to cross zero even if you go from +V to 0V, and some AC relays will only switch at the zero cross point.