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The DIRIS A-20 (48250402) is a kilowatt hour (kWh) energy and power meter that communicates on a EIA RS-485 network, Measures 1, 2, or 3 phases, 50 to 520 Vac (phase/phase) and 28 to 300 Vac (phase/neutral), Currents from 5 to 6,000 (5 amp output CT), is panel-mounted, add on input/output modules allow for up to 3 pulse inputs and 1 pulse output, has a backlit LCD display, the ability to detect incorrect wiring and automatically correct CT installation errors, is instrument powered from 110 – 240 Vac, is ANSI C12.20 Class 0.5, IEC 61557-12, and UL 61010. Meter purchase page.

General information

  • Product: DIRIS A-20
  • Part Number: 48250402
  • Long Description: DIRIS A-20 with RS485 Communication; Multifunction Power Metering and Monitoring Device (PMD); panel mountable
  • Short Description:DIRIS A-20 with RS485 Communication
  • Country of origin: France

Key Features

  • Backlit LCD display
  • Pushbuttons to access all the measurements on the display
  • Wiring errors detection
  • Two Module inputs
  • ANSI C12.20 Class 0.5 accuracy
  • UL 61010, IEC 61557-12


Standards and Regulations

  • IEC/EN 61010-1
  • UL 61010-1, CAN/CSA C22.2 No. 61010-1, UL file number: E257746
  • ANSI C12.20 Class 0.5


  • Communication Ports: RS485, output
  • Communication Protocols: Modbus RTU



  • AC Voltage and Current
  • 50/60 Hz
  • +/- kWh, +/- kvarh, kVAh
  • V1, V2, V3, U12, U23, U31, f
  • I1, I2, I3, In, ∑P, ∑Q, ∑S, ∑PF
  • P, Q, S, PF per phase
  • Voltage Ph/N unbalance
  • Voltage Ph/Ph unbalance
  • Current unbalance

Power Quality

  • Power Quality measurements:
    • THD V1, V2, V3, U12, U23, U31, I1, I2, I3

Modbus Registers