What Is a Single Phase Electronic kWh Meter?
A single phase electronic kWh meter is a solid-state device that measures the amount of electrical energy consumed by a load connected to a single-phase AC supply. Unlike electromechanical meters with a rotating disk, electronic kWh meters use digital sampling of voltage and current to calculate energy with high accuracy and stability. They are the standard choice for homes, shops, apartments, and light commercial installations.
How a single phase electronic kWh meter works
Inside the meter, precision sensors measure the instantaneous voltage and current of the circuit. An integrated circuit samples these values thousands of times per second and multiplies them to obtain real power, then integrates power over time to produce energy in kilowatt-hours. The result is stored in non-volatile memory and shown on an LCD display.
This method delivers class 1 or class 2 accuracy under IEC 62053-21/22 and is far more stable across temperature and load variations than mechanical designs.
Key features of electronic kWh meters
- Accurate measurement — class 1 or class 2 energy measurement with wide current range.
- LCD display — total kWh, voltage, current, power, and frequency data.
- Multi-tariff support — day/night or TOU registers for flexible billing.
- Communication options — RS485/MODBUS, pulse output, or wireless modules.
- DIN-rail mounting — compact form factor that fits standard distribution boards.
- Anti-tamper features — terminal cover detection and event logs.
Single-phase vs three-phase meters
| Parameter | Single-phase meter | Three-phase meter |
|---|---|---|
| Supply | 230 V AC, one phase | 400 V AC, three phases |
| Typical loads | Homes, shops, small offices | Industry, commercial, EV chargers |
| Common current ranges | 5(60)A, 10(100)A | 5(65)A, CT-operated |
| Form factor | DIN rail or panel | DIN rail or panel |
Where electronic kWh meters are used
Electronic kWh meters are used wherever accurate, readable energy billing matters: residential apartments, rental rooms, small retail, offices, and submetering in multi-tenant buildings. With RS485 or pulse output, they also feed into energy management systems and monitoring dashboards.
FAQ
What does 5(60)A mean on a meter?
The basic current is 5 A and the maximum current is 60 A. The meter is calibrated at the basic current and can operate continuously up to the maximum.
Do electronic meters need to be reset?
No. Energy registers are stored in non-volatile memory and survive power cuts.
Can a single-phase meter measure solar export?
Bidirectional models can measure both import and export energy, which suits solar and net metering installations.
Final Thoughts
A single phase electronic kWh meter gives accurate, stable, and readable energy measurement for residential and light commercial use. Yomin Electric’s single-phase energy meters include DIN-rail, MID-certified, smart, and prepaid versions to match any project.
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