I have tested a TRB140, supplied with 12V DC. On one output I connected a 12V DC relay (with protection diode). I was able to switch it on, however the voltage on the relay was 1,5 V less than the supply voltage. The relay draws 100mA (measured). I did not cut the PR2FK20M so maybe this voltage drop is partly caused by cable and connector losses.
If I would extrapolate this result 500mA current would be far too much ?
In the off position, the idle current, when just a resistor in series with a LED is connected, 100myA flow, which causes the LED to falsely emit some light.