I changed two controllers/transformers earlier for a friend. I was there to do six. I connected the first two and well, they blew up .
Hmmmm. Yes quite possible I suppose. I didn't investigate any further. It's a love job and my second visit already. I thought it was going to be a simple swap over, but some of the existing lights were 240 v AC. That's when I told her to order the controllers, and then they came without 240 v plugs. So it was all annoying to be honest. She's going to Bunnings to buy new stuff.
I wonder if we can tell from the photo if it is indeed the wrong way around.