Home Meter & Measurement SEM4640 & SEM4740 Three Phase Power Quality Meter

SEM4640 & SEM4740 Three Phase Power Quality Meter

SEM4640 & SEM4740 Three Phase Power Quality Meter

The SEM4640 & SEM4740 Series is a three-phase power quality meter with WiFi, RS485 Modbus communication, 0.33V CT and Rogowski coil input, designed for power quality monitoring, energy measurement, and solar inverter reverse current prevention.

• Three-phase power quality and energy monitoring
• Compatible with 0.33V CT and Rogowski coil inputs
• CT input options: 80A / 100A
• Rogowski coil input options: 400A / 600A / 1000A / 3000A
• Active energy accuracy: Class B according to EN50470-2022
• Reactive energy accuracy: Class 2 according to IEC 62053-23
• Voltage and current accuracy: 0.5% of range maximum
• Harmonic analysis of voltage and current up to 41st order
• Measures more than 300 electrical parameters
• Supports WiFi, RS485 Modbus, and remote data access
• Programmable CT/PT ratio and wiring method settings
• Supports 3P4W, 3P3W, and 1P2W wiring systems
• Programmable digital output for load shedding and export limitation
• Suitable for solar inverter reverse current prevention

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User Manual

Features & Advantages

feature

Power Quality Monitoring

Measures key power quality data including harmonics, phase sequence, voltage asymmetry, current asymmetry, power factor, and demand, helping users identify grid and load-side power issues.

41st Harmonic Analysis

Provides voltage and current harmonic analysis up to the 41st order, making it suitable for systems with non-linear loads, inverters, drives, and other power electronic equipment.

WiFi & RS485 Communication

Built-in WiFi and RS485 Modbus communication allow easy integration with local monitoring systems, cloud platforms, and energy management software.

Solar Export Control

Programmable digital output and reverse current detection help support solar inverter export limitation and prevent excess electricity from being fed back to the grid.

Flexible Current Input

Compatible with both 0.33V CT and Rogowski coil inputs, supporting applications from standard three-phase panels to higher-current distribution systems.

Target

Application Areas

01
Industrial Monitoring

Monitor three-phase power parameters, power quality, harmonics, and demand in factories, workshops, and industrial distribution systems.
02
Solar Inverters

Measure real-time power flow and support reverse current prevention for single or multiple solar inverter systems.
03
Commercial Buildings

Provide energy and power quality monitoring for offices, malls, schools, hospitals, and other commercial electrical installations.
04
Distribution Panels

Integrate into low-voltage distribution panels, control cabinets, and energy management systems for centralized electrical data collection.