Hokie 71 - There are four pairs (one hot connection & one common connection per pair) on this unit so you can hook up four separate loops. It's installed "inline" on the feeders from transformer to layout buses. There is also a single spade for a ground wire. I was using the two outside pairs for my two mainlines.
I never had the unit apart before the incident so I don't know how the diodes looked before totally frying. Apparently when they cooked it created a short in each of the two spade pairs. The other two unused pairs still test okay and not electrically connected.
