Yesterday I started hooking circuits into the SSR bank.
I figured I would start with the circuit easiest to test things with.
One of the shop ones of course.
At first I plugged a small fan in, all worked just as expected.
Then I plugged in the air compressor, Turned on the SSR, and it fires up just as it should.
As it was getting close to the shut off pressure I figured now was the time to see if the SSR turns off.
Well it didn't
These SSR fail in the "ON" state. and it had failed.
These are 40 amp 28-380 volt SSR, on a 20 amp circuit. They are supposed to have a surge capacity of something like 10x the rated.
I'm not sure if this is the expected result, or was this a dud.
I had previously in testing a couple of these (from another supplier) to see if they would do the job for me.
I loaded the test one with not only the same air compressor but a wire feed welder doing small test welds, and an air conditioner with the intent to massively load this thing with some varied loads, until it trip the breaker or roasted the SSR.
It did well for the ~5 min it took for the *30* amp breaker to trip.
Just got the heatsink quite warm.
As far as other loads on other circuits I moved to other SSR.
So far lights and pretty much any electronics like TV and other such sort the other SSR handle well.
I would rather not wreck a bunch of these things in the learning process, or by someone plugging in a vacuum or similar if I leave them in place.
But I would still like to use them if possible.
Is it these SSR just cannot handle high current motors and my first test was a fluke?
My understanding of larger SR is somewhat lacking I suppose.
Does anyone have any advice on these?
The datasheet on these SSR
http://www.fotek.com.hk/solid/SSR-1.htm