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This SSR relay has an input impedance given in its datasheet as:

enter image description here

It says "Nominal Input Impedance is a current regulator". At 5V 16mA.

But how can I model this type of input impedance? I will use 12V input but there is no info that I can estimate the current or input impedance.

Does that mean whatever voltage applied it will regulate the current to around 16mA?

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The input terminals appear to be the control terminals that require (typical) 16mA to operate independent of input voltage within the specified range.

This is not unexpected as the switching elements are SCRs that are isolated from the input, which require a certain amount of gate current to maintain the ON state.

The output terminals are the relay contacts and the output terminal current will be load dependent.

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