unixguy Posted January 29, 2021 Share Posted January 29, 2021 Hi all, I have a 10A rated 240V delay-off light switch which I'd like to use for my 35W 240V bathroom extractor fan. The instructions that come with the switch states it shouldn't be used for heating or extractors, but I'm wondering whether this just refers to the maximum load expectations or is there some reason an inductive load wouldn't work? Link to comment Share on other sites More sharing options...
Temp Posted January 29, 2021 Share Posted January 29, 2021 Inductive loads can cause arcing in relay contacts. When the relay opens the inductor tries to maintain the current flowing through it so the voltage across it rises causing an arc across the contacts. Link to comment Share on other sites More sharing options...
unixguy Posted January 29, 2021 Author Share Posted January 29, 2021 Right, so even though its a low load, it still wouldn't be a good idea. Thanks for the reply. Link to comment Share on other sites More sharing options...
Temp Posted January 29, 2021 Share Posted January 29, 2021 You can fit something like this to the extractor fan to reduce or eliminate the problem.. https://www.ebay.co.uk/itm/Rc-absorption-snubber-circuit-module-relay-contact-protection-resistance-UK/333847511621?hash=item4dbadcc245:g:EoAAAOSwBYhc3ikG&redirect=mobile Link to comment Share on other sites More sharing options...
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