Hewlett Packard
6459A

This DC Power Supply model 6459A made by Hewlett Packard is a completely transistorized, well regulated, constant voltage and constant current supply.

• Output voltage: 0 to 64 V DC
  
• Current limit range: 0 to 50 A

It is a 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.

Further features:

• General purpose SCR regulated unit with moderate regulation and ripple
  
• Input Voltage: 208 / 230 / 460 V AC, +/- 10 %, 3 phase
  
• Regulation of 0.2%
  
• CV/CC operation, metered
  
• 0-80 V voltmeter and 0-50 A ammeter provided on front panel
  
• Remote sensing and programming

Please find a corresponding data sheet here.
Please find an enlarged image here.