Define:
The inrush current from inductive loads (like refrigerator motors) will cause sparks across the relay contacts that will weld them together, use non-cheap, quality, name brand relays with RC snubbers across the load.
Yeah I think that's what's happening, I can't define at the moment as I'm not with the work. Thank you for your help though, will look into it. I need to find something fairly affordable as I need 50+ relays...
I would not do it for a long time, using a breadboard like that.
Don't pull current from the 5 volt pin of the controller. I might work shortly but is really bad practise. Is 70 mA a total relay current or the current for one relay? 3 relays and 210 mA.... I would not do it.
Okay, thank you. Using a separate power supply then?
That's the way I would go. USB for the controller is perfect but for the peripherals, give them a good separate supply.
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It seems some appliances, like a 240V 50W fan, make the relays stick in the on position. Would it be worth using a snubber this? If so, where should it go in the circuit?
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