Want to see the inside of a Fotek SSR

So reasonably well designed, but only half the specs . . .Good reason for using a 40A and hope it had a 20A TRIAC . . .Think I need to have a look at taking one apart

All a bit beyond me, but I understood enough to be glad I went for a 40A in my RIMS controller though

Beyond me as well, but nice to hear someone who knows his electronics and 40 amp for me next time, just to make sure.
S

Until we know a 40A one has a better triac in it, it is still up for debate. I don't have any to take apart so will be interested in what Aleman finds out.

The triac being underrated does not give confidence in these Chinese clones. It is not even clear if it is zero crossing, but as the driver chip seems to have six pins it is likely to be an MOC3063 which is zero crossing. Some of these Chinese SSRs that people have bought are not zero crossing. One in particular, that was very popular among home brewers had its internal circuit diagram published on the ebay sellers page and that certainly was not zero crossing.

It is probably safer, for those with the skills, to build their own. One snubberless triac of a rating of choice, one MOC3063 and three resistors and the job is done. Won't match Chinese prices, but is still quite inexpensive and at least you know what you have got. The most expensive bit is the heatsink, but you can buy that from China with relative security.

Honestly. What do people expect for £2?
I went for the 40A too just in case which has been fine.

A quality solid state relay rated for 25a would cost £40+ so if you use one that costs £2 are you seriously expecting the same quality. If something appears to good to be true then it most likely is.
I work on the premise that they are likely to fail but if they last a year then it would take 20 years of failures to match the high price item. Buy cheap, buy twice etc.

I can see the different points of view and I know where my next one will come from.............................China of course
Still a great video

S
P.S. might get a few spares at the price.

I have a few of these, around 6 on my system although mine at the 40A version. Never had 1 fail yet but then again it is only driving around 10amp.

.... could n't believe the fotek deal, I got them,

THEY ALL FAILED

and unlike most relays they FAILED ON.

I opened mine up, utter dinky-toy clone crap

can't win them all....

Most relays I have used have failed on as well. The contacts weld together. When I used to work in the capacitor manufacturing sector (early 80's), one of the jobs was "un-welding" the relay contacts in the test bench. 30+A relays were used and they used to weld together regularly.
With SSR's the path gets "burned in", making it always on.
I have a couple of those "remote control" mains sockets that both have relays that have welded in the on position. The led claims it is off but the device is ON.