@honeycris said in Blew a fuse! replacing 7.5A fuse for 10A (Duex5)?:

Got it. And that is because the SSR is controlled by the board but the power from the PSU doesn't run through the board, rather it runs through the SSR?

Correct.

@honeycris said in Blew a fuse! replacing 7.5A fuse for 10A (Duex5)?:

Sorry for the basic questions. I am learning...

We all start at zero. 😉

@Cynopolis you said your signal is always high, maybe you need a pull-down resistor to take the signal down when signal is 0. (PS hope you connected Dir- with ground)