The Hewlett Packard 6459A is an SCR-3 Series regulated power supply designed for medium to high-power applications requiring a fixed or variable dc source with moderate regulation and ripple. Large easy-to-read panel meters continuously monitor output voltage current. Input and output power, remote sensing, remote programming, and auto-series, -parallel, and -tracking connections are made to bus bars and terminal blocks on the rear panel. AC line loss protection circuit monitors 3-phase input and cuts off SCR's and opens output bus if a phase drops out, operation resumes when ac input returns to normal. Features General purpose SCR regulated unit with moderate regulation and ripple Input 208/230/460Vac ±10%, 60 Hz, 3-phase Output of 0 to 64 Vdc at 0 to 50 A Regulation of 0.2% CV/CC operation, metered 0-80V voltmeter and 0-50A ammeter provided on front panel Remote sensing and programming