Active power factor correction allows for better use of available power and allows converter to operate on 120-volt AC 15-amp branch circuits, leaving plenty of power for running other 120-volt AC accessories. TempAssure capable with Parallax Power Supply�s patented TempAssure module #77639 (4400TAU) sold separately. Features Provides filtered DC output from 30-amp shore service Converter operates on 120-volt AC 15-amp branch circuit TempAssure capable with TempAssure module #77639 (4400TAU), sold separately 11-position fuse block with blown fuse indicators Durable steel enclosure