I have been testing with the SSRF-240D25R to see his application on shutting down a load current that in my case is mains powered from the grid.
In order to see if the relay stops the currents flow as soon as I stop feeding the control side, I did a test where I put a LED on the load side and turned on the control side. I expect to see the LED turn on when I feed the control and turn off as soon as I turned off the control side. In the end, only one part of the experiment went as expected the LED turned on but stayed on long after a shut down the control side. I can´t see what might be the problem even though it should be something simple to resolve.
Here is an electric scheme of the montage:
In summary, the SSRelays+Detect is the 12 V that I use to feed my control side, to activate the Mosfet Q1 I apply 3.3 V (SSRelaysDrive), voltage converted from the 12 V to bias a voltage regulator and in this experiment I used my STM32 Nucleo, "MCUB", as the load.