I. Basic Information
Table Item Specifications Model ME431 Type Rail type Current Sensor Type Voltage output current transformer, Rogowski coil Core Features Supports simultaneous monitoring of up to 4 three-phase circuits; can be directly connected to a Rogowski coil; supports wide current range, no-disconnection measurement; optional zero-sequence current and temperature detection functions
Wiring System 3P4W 4CT, 3P4W 3CT, 3P3W 3CT, 3P3W 2CT, 1P3W, 1P2W Application Areas Power analysis, power measurement
Display 2.0 inch TFT color LCD display with 320*240 resolution

II. Electrical Measurement Parameters
Current Measurement Channel Input Voltage Range: 0~900mVAC peak, 636 mV RMS Measurement Range (Adapted to different sensors):
Rogowski Coil:
50mV/kA@50Hz(0-12000A), @60Hz(0-10000A)
85mV/kA@50Hz(0-7000A), @60Hz(0-6000A)
100mV/kA@50Hz(0-6000A), @60Hz(0-5000A)
Voltage Output CT: 0~99999A
Voltage Measurement
Measurement Range: 0~600VAC Phase Voltage
Maximum Measurement Value: 720VAC Phase Voltage (i.e., the maximum voltage between phase A and phase N ports is 720V)

III. Hardware and Communication
Table
Item Specifications
Digital Signal / Relay Output
1-channel electromagnetic relay output, contact capacity: 3A 30V DC, 3A 250V AC
Storage
Built-in eMMC; default 8GB (expandable to...) 64GB)
Data Export: Built-in FTP server, data can be exported via FTP software such as FileZilla.
RS485 Communication: 1 RS485 interface, two-wire half-duplex; baud rate 2400bps~115200bps; protocol: Modbus-RTU
Ethernet Communication: RJ45 Ethernet interface; protocol: Modbus-TCP

IV. Real-time Measurement Data
Table:
Category
Measurement Item
Instantaneous Value
Phase Voltage (U1, U2, U3, AVG, U0 Zero-sequence Voltage),
Line Voltage (U12, U23, U31, AVG),
Current (I1, I2, I3, AVG, I0 Zero-sequence Current),
Grid Frequency (F1, F2, F3, Σ Composite Value)
Power / Power Factor
Power Factor PF (PF1, PF2, PF3, Σ Composite Value),
Fundamental Power Factor DPF (DPF1, DPF2, DPF3, ... Σ (Comprehensive Value), Active Power (P1, P2, P3, Σ Total), Reactive Power (Q1, Q2, Q3, Σ Total), Apparent Power (S1, S2, S3, Σ Total)
Electrical Energy: Positive/Negative Active Energy (EP1-EP3 and total, metering automatically resets to zero at 1.0×kWh), Positive/Negative Reactive Energy (EQ1-EQ3 and total, metering automatically resets to zero at 1.0×kVarh), Apparent Energy (ES1-ES3 and total, metering automatically resets to zero at 1.0×kVarh), Transient Energy (ET1-ET6, metering automatically resets to zero at 1.0×kWh)

V. Harmonic and Waveform Analysis
Voltage Harmonics: Total Harmonic, Odd/Even Total Harmonic (U1/U2/U3), 1-50 Secondary harmonics (U1/U2/U3); corresponding harmonic voltage values
Current harmonics: Total harmonics, odd/even total harmonics (I1/I2/I3), 1st-50th harmonics (I1/I2/I3), K coefficient; corresponding harmonic current values
Phase analysis: Voltage-current phasor diagram, phase sequence (voltage/current), voltage phase angle (U1/U2/U3), current phase angle (I1/I2/I3), voltage-current phase difference (UI1/UI2/UI3)

VI. Demand and Unbalance
Demand measurement: Maximum demand and corresponding time for total active/reactive/apparent power; maximum current demand and corresponding time
Unbalance: Voltage unbalance (negative sequence, zero sequence components), current unbalance (negative sequence, zero sequence components)
Extreme value statistics: Maximum/minimum values ​​of phase voltage/line voltage/current/active/reactive/apparent power (based on average value statistics)