In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Simply put, everyone would have to just guess.  
My guess is that you will use far less than 100ma [Guenther says 10 ma is a likely right], unless it is a huge relay.  Likely 10ma for the SXes general functioning and 25ma maximum for the one relay pin.

The way to accurately find out is to build the device and measure the current draw during actual use.

Of course we all understand that you might want to skip that tedious step. That is normal human nature.

In this case, I truly belive that you won't fine anything in a 120VAC supply that provides under 600ma because most if not all these supplies are intended to regard lithium batteries.  There is not much reason to build a small supply as it would just slow down charging and the size is about as small as it can physically get.

So why worry?

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