Astron Corporation Rack Mount Switching Power Supplies feature high-efficiency switching technology specifically filtered for use with all communication equipment, including HF. Features include a heavy-duty design in a low profile, lightweight package. Power supply protection includes foldback current limiting, crowbar over-voltage, over-temperature shutdown and an internal fuse. Updated -AP units have front panel dual Anderson Powerpoles and dual 5.2 Vdc, 1.5A USB A ports. All switching models feature automatic AC input selection from 90-250 VAC @ 50/60 Hz. Meter versions feature dual LED voltage and current meters.