You can see some of the items I chose to connect to the box in the photo below:
The top connector is the connector that provides power to the passive Rigrunner box. It is also fused. I also connected my AIS transponder into this box since it is located near this box. I also have connected the on board music boom box to the bottom connector pair. I also later connected the two ENGEL refrigerators to the box. Finally, I also connected a small fan to the remaining connector. In short the rigrunner allows for one to mount a fuseable junction box in a convenient location on the boat and also allows on to make changes easily without a lot of rewiring.