MM-RW

Rogowski three-phase multimeter

Three-phase measurement of electrical variables with Rogowski coils, without interrupting the installation.

  • Rogowski coils
  • Three-phase measurement
  • No-outage installation
Hardware Rogowski three-phase multimeter — MM-RW

Measuring current, voltage, power and energy on a three-phase panel usually means cutting service to fit closed CTs. This multimeter connects with open Rogowski coils or voltage-output clamps, without dismantling the wiring, and delivers every electrical variable over RS-485 Modbus RTU.

  • No service interruption

    Installs with open Rogowski coils or voltage-output clamps, with no panel disassembly and no power interruption.

  • Every variable in one device

    Voltage, current, power, energy, harmonics, unbalance and demand, with maximum and minimum logging.

  • Flexible tariff metering

    Up to 6 configurable time bands for tariffed energy, in manual or automatic (RTC) mode.

  • Direct Modbus integration

    Native RS-485 Modbus RTU communication, ready to join any existing supervision system.

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01Technical specifications

Technical specifications

  • Electrical measurements

    • Phase and line voltage, per phase and average
    • Per-phase, average and neutral current
    • Grid frequency and power factor (PF and DPF) per phase
    • Active, reactive and apparent power per phase and total
    • Active, reactive and apparent power demand, with peak values and time of occurrence
    • Voltage and current unbalance (negative and zero sequence)

  • Energy and harmonics

    • Imported and exported active, reactive and apparent energy
    • Tariffed energy across up to 6 time bands
    • Voltage and current harmonic distortion (THD, even and odd) up to the 50th harmonic
    • Phasor diagram and phase sequence
    • Maximum and minimum logging for voltage, current and power

  • Inputs, outputs and communication

    • Current input via open Rogowski coil or voltage-output current clamp (VCT)
    • Voltage input up to 600 VAC phase-neutral (maximum range 720 VAC)
    • 1 normally-open electromechanical relay output: 3 A 250 VAC / 3 A 30 VDC
    • 1 dry-contact digital input, optocoupler-isolated (5 kVrms)
    • RS-485 Modbus RTU communication, 2400 to 38400 bps
    • 1.77" color TFT display with 4 navigation keys

  • Accuracy, power supply and mechanics

    • Current accuracy: 0.1% + sensor accuracy
    • Voltage accuracy: ±0.2% (60-600 VAC)
    • Active and apparent power class 0.5S · reactive power class 1S (IEC 62053)
    • Auxiliary power 95-265 VAC / 110-370 VDC or 24 VDC depending on version, max. consumption 3.5 VA
    • Operating temperature -20°C to +70°C, 5-95% RH non-condensing humidity
    • DIN rail mounting, IP20 protection rating, pollution degree 2

02Main applications

Main applications

  • Three-phase measurement on distribution panels without a service outage
  • Power quality and harmonics analysis in industrial installations
  • Billing and time-of-use tariff metering
  • Energy audits and per-circuit consumption verification
  • Monitoring three-phase load unbalance
  • Integration with SCADA systems via Modbus RTU

Solutions using it

Where it is deployed

03Other products

Other products

Need this unit, or a variant of it?

We adapt inputs, outputs, protocols and operating logic to the requirement. Tell us what you need to solve.

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