Testing Technology

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Adjustable & Constant Voltage Supply Reolab 423

High voltage supply with AC-Output


The high-voltage supply unit is intended for testing current converters in the energy sector, as well as testing the entire auxiliary converters and switching power supply systems used in railway installations.

  • Conforms to: VDE 0552
  • Test voltage 3 kV for the primary circuit
  • Protection IP 20
  • Ambient temperature: 40 °C


  • Power switch with a magnetic and thermal cut-out in the mains input circuit
  • Main contactor for operational switching of transformers
  • Emergency Off switch and safety loop with warning lamps
  • Air-operated short-circuiting and grounding switch for the DC output
  • Viewing window for DC analogue voltmeter and air-operated breaker
  • Analogue meters for V & A in the mains supply (96 x 96 mm format)
  • Digital meters for V & A in the AC/DC output (96 x 48 mm format)
  • Analogue meters for the DC output
  • Electronically-controlled voltage stabilization
  • Forced zero-position for the variable transformer
  • Output protected against short-circuit and overload
  • Selectable DC output voltage range
  • A discharge circuit for the external DC link capacitor
  • Pushbutton and indicator lamp (22 mm Ø) for operation


  • Testing of AC and DC current converters with one unit
  • Constant residual ripple over the entire adjustment range of the DC output
  • The clean sine wave of the AC output voltage
  • No EMC problems
  • Control error approx. 1 % for AC and DC outputs
  • Fast regulation of voltage variations
  • Outputs protected against short-circuit and overload
  • Doubled output current at half the DC voltage selectable
  • True RMS measurements with the digital meters
  • System operation is possible by means of a control panel not in the immediate vicinity of the HV supply unit
  • Grounding possibility provided for the DC output
  • Additional control of supplementary equipment is possible via the control panel


  • Rated voltage 3 x 400V
  • Rated power 0-150 kW/kVA


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