There is a solid state relay (AQH1213) that switches the load to 220 V using 5 V (Arduino).
The insulation voltage between the low and high voltage circuits in this relay is 5 kV.
The challenge is to provide additional isolation for this relay and controller contact.
For these purposes, I plan to use an optocoupler.
Solid State Relay LED Characteristics:
Forward Current: 50 mA Peak Forward Current: 1A Reverse voltage: 6 V Recommended input current per LED: 15-25 mA A current limiting resistor of 300 Ohms is installed between the relay and the controller.
What optocoupler output current should I choose?
Initially, there were doubts about the high peak current of the solid state relay (1A). At this maximum current, the optocouplers require a supply voltage> 5 V, which in my case is not suitable, since all control circuits have a voltage of 5 V.
A current-limiting resistor should clearly reduce these indicators, but I do not know how accurate.
Applying Ohm's law (U = 5 V, R = 300), I got a very low current value of 0.016 A, is that true? If this is true, then most likely it does not take into account the maximum forward current.