Newmar APS-70 Automatic Power Selector - 70A [APS-70]APS 70 Automatic Power Selector 70A The Automatic Power Selector (APS) is a solid state device that enables the installation of a seamless, redundant power system for critical electronic loads. It selects the higher voltage of two independent DC power sources and routes power to the load. Should one source falter or fail, the other will automatically supply the load with no transfer delay, and the operation continues uninterrupted. Two independent