I. Basic Overview
Table Item Parameter
Model Main Meter: ME131M; Sub-meter: ME131S
Type Rail-mounted Smart Meter
Accuracy Class 0.5S
Supported Sensors Voltage output current transformer, Rogowski coil (RJ12 interface, direct connection possible)
Monitoring Capability Up to 32 channels (single-phase/three-phase)
Supported Wiring Systems 3P4W_3CT, 3P3W_3CT, 3P3W_2CT, 1P3W, 1P2W
Application Areas Power analysis, energy consumption monitoring
Display Screen None Body Color White

II. Physical Specifications
Table Item Main Meter ME131M Sub-meter ME131S
Weight 122g 59g
Dimensions (LWD) 9.38.03.6CM 9.38.01.81CM

III. Measurement Specifications
1. Current Measurement
Channel Input Voltage Range: 0-900mVAC peak, 636mV RMS Rogowski Coil Measurement Range: 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 Type CT Measurement Range: 0~99999A
2. Voltage Measurement
Measurement Range: 0~600VAC
Maximum Measurement Value: 720VAC
IV. Digital Signals
Table: Item Parameters
Switch Output: 1 channel electromagnetic relay output, contact capacity: 3A 30V DC, 3A 250V AC
Switch Input: Optocoupler isolation (5kVrms)
V. Communication Specifications
Interface: 1 channel RS485 (Two-wire half-duplex)
Communication Rate: 2400bps~38400bps
Communication Protocol: Modbus-RTU
Supporting Software: Included test version of host computer software

VI. Power Supply Specifications
Table: Supply Method
ME131M2 220V AC auxiliary power supply (95-265VAC), 45-60Hz
ME131M3 24V DC auxiliary power supply (18-36VDC)
ME131M5 Powered by main circuit (between V1-V3), 90-520V
ME131S No independent power supply, dependent on the host
Maximum Power Consumption ≤3.5VA

VII. Model Naming Rules
Coding Structure: ME131-Master-Slave Type-Power Supply Type
Master-Slave Type
M: Master, with power supply
S: Slave, without power supply, dependent on the host
Power Supply Type
2: 220V AC auxiliary power supply (95-265VAC)
3: 24V 5. DC Auxiliary Power Supply (18-36VDC)
6. Main Circuit Power Supply (90-520VAC)
7. 5VDC DC Auxiliary Power Supply (4.5-5.5VDC)

VIII. Core Advantages
**Wide current range adaptability, supports wire-free measurement**
**Integrated master-slave power supply, flexible expansion**
**Multi-channel monitoring, enabling centralized energy consumption metering across multiple circuits**