Please help me calculate a relay

Thread Starter


Joined May 9, 2013
I want a relay that will switch toggle on/off mains power of 240V AC Australian power. (I don't know the amps) The power that will decide whether or not to allow the mains power to flow will be 5v DC. I don't know the amps but it will be very small. It will be driven but the USB connection from a laptop.


Joined Aug 21, 2008
I think in this case, it would be wise to use a relay rated as the fuse or circuit breaker that feeds the circuit.

@chris64 , what specific information are you looking for? (how can we help?)