I am amateur and a thought occurred - one reason to use Relays over Transistors (apparently) is when it is in an off position there will be no leakage to the load. At the expense of an extra component or two is there a way to prevent leakage when using transistors? Would a Zener diode on the output of the transistor prevent all leakage? I am guessing not as the leaking voltage will still be similar to the transistor output voltage (haven't measured yet) but the current will be lower - are there diodes that prevent the flow of current until a breakdown amperage? Thanks!