That works fine for 120v circuits, but for a 240v circuit you need 1 coil for each leg,which means 4 coils for the 2 circuits, which is a bit of a waste for a purely 240v load. No sense using twice as many, if math with do the job.Why don't you just get a second coil thingy and put it on the other line and run them in series with each other into Channel 2? That's what I did with mine. I have 3 circuits for lighting, and I did this with 3 of them and put them all on one channel.