Correct, but you could put a small amount of current through and not cause a change in the relay if there isn't enough voltage to pull in/drop out the armature. Was simply stating that amperage has no bearing, otherwise it would defeat the purpose of using the relay.DucRider said:
"Except it's not amperage that triggers the relay, it's voltage. Voltage is what causes the relay circuit to open or close."
Not to quibble, but it's the CURRENT flowing through the relay coil that generates magnetic field that moves the relay's armature.
It's the VOLTAGE that drives the current through the coil's resistance.
The only reason I mentioned the 170ma coil current was to show that for the relay control circuit, you don't need to use heavy-gauge wire to minimize voltage drop.