# Should I use a mechanical or solid state relay for a hairdryer

I have a device that needs to use a controllable source of hot air. I want to use a hairdryer as they're available everywhere and very cheap too.

I have a board with these relays on it (and I'd be happy to be able to use it :))

I am in the EU now and the hairdryer would be 220v / 1500w so the specs below should work.

but the main question is:

Should I use a mechanical or solid state relay for this kind of load?

• Thats like the following question: Should I use bike or car to get at work? Without further requirements, both should work ok. – Stefan Wyss Jun 22 '18 at 12:55
• The only extra data is that the relay will be closed for roughly 10 seconds and open for 3-4minutes and the cycle repeats. I'm questioning if the solid state relay could heat up more over time, etc; this kind of things – Thomas Jun 22 '18 at 13:04
• No, there’s no difference, because nothing gets heated up if the relay has sufficient power rating. – Stefan Wyss Jun 22 '18 at 13:30
• The $1500 \:\text{W}$ argues to avoid the SSR, as the SSR will dissipate about 1% ($2\:\text{V}$ out of $220\:\text{V}$), or $15\:\text{W}$. Which is a heating problem requiring bulk space and cost. But the 3 minute cycling argues for solid state, depending on how many cycles and for how many months or years you want operation. I'd consider a hybrid here. Use the SSR, then fire the relay and hold it, then release the relay, then release the SSR. Should save the relay contacts that way. – jonk Jun 22 '18 at 13:41
• @StefanWyss, hopefully the air will get heated up. :-) – Cristobol Polychronopolis Jun 22 '18 at 13:45