A heating controller unit I have allows you to connect a 24-240v supply to it via a simple 2-terminal connector - all this does is trigger a something in the software (i.e. switch another output on or off) when a voltage is applied.
As it doesn't connect to anything that would consume electricity (i.e. a light, motor, etc) is it safe to assume that in reality applying 240v to this connection would only consume milliamps?
Or would it not actually use anything?
Not enough detail, do you have a circuit diagram?
Google "volt free connection".
No load, no current. Current will depend on the resistance of the load. For heating the likely max. current is going to be around 3A if it's switching a pump/boiler etc.
Rich.
I like that answer! Thank you! 🙂