Before installation, it's important to know what makes up a distribution box. The enclosure protects the electrical components from water, dust, and damage. Whether you're using their customizable Rack Panel Distribution systems. Just know it's not backward compatible - you'll need GE's upgrade kit to complete the system. Compatible with Ducted or Ductless Systems: Works with GE Appliances ceiling assemblies and thermostats to match your RV setup. AC Unit Only Interior Components Sold Separately: Requires a GE control board. Where is the DC power supply located? The DC power supply is right above the controller, it'll have part #60-2012A on it. It is commonly used in homes, offices, and industrial settings to control and protect electrical circuits.