"Mike Tomlinson"


We have a similar problem at work with cryogenic coolers, which are more
or less like a fridge - a compressor and heat exchanger. Like you say,
the fuse doesn't blow, just parts cleanly due to inrush surge at switch
on.


** What absolute crap !!!

The magnetic inush suge of a toroidal tranny plus filter caps charging will
easily SPLAT an undesized "slo blo" or " fast " fuse completely.


Don't see why not. Or a 1 ohm wirewound resistor which will dissipate
3.15W at peak, so use a 5W one


** ROTFL - what difference is 1 ohm gonna make ??


will mount on small high temp board and wire into the neutral


Are polyswitches used in these circumstances , ie not purely "fuse"
action or generic name for devices specific for this purpose?

I would say they are unsafe for use on mains, simply because they
reconnect the current when they heal. If there is an actual fault in
the equipment rather than the inrush current blowing the fuse and
disabling the supply permanently, it could lead to a fire.


** Polyswitches all start of with a very low resistane then go high after
some time at high current - mains voltage rated examples do not exist.



.... Phil