Not sure about this though, as its not a new idea to have capacitors across
the mains for filtering etc.
I just think possibly that a bit of wear and tear, could be heat related if
its all made of plastic, has somehow pushed the bias of the switch too close
to one direction . When the stress changes after removal its just enough to
work again. Could be as simple as a hole elongated where the spring seats
at one end.
Brian

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"Chris Green" wrote in message
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Paul wrote:
williamwright wrote:
On 14/11/2020 22:23, Roger Hayter wrote:


The only thing I can think of is an inductive load causing the
contacts to arc
and fuse. The monitors aren't ancient very large CRT ones I suppose?


No, new Samsung ones.

I mean, the weird thing is that some of the faulty switches have come
alright once they're removed from the panel. But I have to throw them
away, obviously. I have one in my hands now. It doesn't seem to be
caused by stress on the 1/4" connectors.

Bill

Inrush on a PC supply is 40A to 80A for a couple of 50Hz cycles.

OK, what kind of switch likes that.

Yes, I don't think it's even for as long as "couple of 50Hz cycles", I
think it's simply the mains rated capacitor that is fequently
connected directly across the incoming supply.

When I plug my laptop's power supply in there is often a noticeable
'crack' and there are lots of burn marks on the plug as a consequence.
I assume the randomness of it happening is simply down to what part of
the mains cycle it gets plugged in.

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Chris Green
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