Hmm, instead of the SSRs I've got, just use a bunch of these? They're so small and cheap, I'd just solder them in to the circuit similar to the SSRs and voila? BTW any idea why my pot caught fire? It turned in to a LED for a few seconds...
Would this be a suitable alternative - it's available in Australia. Also is this DC/DC? Data sheet states Max load 60 V, mac control 5V so I assume DC/DC but then DS goes on to say Switching type: AC/DC - guessing this means either?
Thank you. Have wired up pretty much exactly that - and even though SSR relay leds flash as per sketch, load side LEDs stay on - same issue, for some reason the switching side isn't cooperating
You can see here the CH1 on-board LED is off yet the yellow LED remains on. Both load-side LEDs remain on even though on-board LEDs show switching per the sketch
Have you tried to use the spare SSR relay? If try after try after try with the same module produces the same failed results. Well, it's like peeing into the wind and getting annoyed that you got wet. Change directions.
Also, the breadboard cannot supply that much current, .3A at the most on a good day.
Bread board power rail split
I've hooked up two SSRs now, one twin SSR and one single using one circuit of each. And again both LEDs remain lit even though on-board SSR LED shows it switching per sketch. Something fishy here... - unlikely two relays faulty. Also not sure what you mean re breadboard, I'm only using it with two LEDs or a Led and a 0.12 A fan, both signifigantly less than the 0.3A you state. Also not sure why you're pointing out the power rail split....
Hi,
Where in your image are the bleeder resistors?
What values did you try?
Did you identify which of the +1 and -2 pins of the SSR are connected to which specific terminals?
Thanks... Tom..... 
Why would a mosfet need a bleeder resistor ?
See post #30.
Tom...
https://www.omron-ap.com.my/service_support/FAQ/FAQ02155/index.asp
Note: Microloads can be supported by using a bleeder resistor as described above. MOS FETs, however, can be used to directly switch microloads without a bleeder resistor.
At his stage, I would be inclined to desolder the relay and test it off the board.
I would connect an LED, 220ohm resistor, 5V and Ground, to the load terminals.
I would connect the negative signal terminal to ground.
I would touch the positive signal terminal with a 5V wire (or whatever trigger arrangement it needs) and see what happens.
Leave the UNO out of it for now.
From the picture in #44, it is not clear what is connected to DC+ and DC- .
Yes, needs a bit of reverse engineering to clearly see how its connected.
Tom..
A ha! I had connected the load side (12 V) to the A1 and then B1 on to the load as I assumed A1-> B1 was ordered, just tried changing this around so 12 V connected to B1 and load connected to A1 et voila! it appears to work. Not entirely convinced so will persevere more, but so far have two separate SSRs working in concert as per the sketch and their on-board LEDs. Could it be so simple? My understanding was the load side was a simple switch, thus wouldn't be polarised
Update: now have 3 SSRs working as per sketch - 1 off dual SSR and 1 off single controlling two LEDs flashing and a computer fan controlled by a switch (this is a test as I'll use this to control a linear actuator and the fan). Appears problem fixed...
thank you to every one for your assistance 
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