Advanced Multi-Parameter Metering
Measures 70+ electrical parameters including energy, power, voltage, current, frequency, power factor and demand, with 4-quadrant import/export analysis.
DEM4K103 6 A Three-Phase CT-Operated DIN-Rail Energy Meter with RS485, RTC and Multi-Tariff
DEM4K103 is a 3P DIN-rail, CT-operated three-phase energy meter rated at 5(6) A with Class C accuracy. It supports RS485 communication with Modbus RTU and DL/T 645-2007 protocols, RTC-based 4-tariff metering and flexible CT/PT ratio configuration (up to 1000:1). Includes internal battery for RTC timekeeping. MID B+D certified by SGS UK.
DIN-Rail Mounting
3P4W / 3P3W CT Connection
MID B+D Certified
MID
6 A Maximum current (CT)
3×230/400 V Rated voltage
Class C Active energy accuracy
−40°C to +70°C Operating temperature
Product Highlights
Flexible CT Metering with RS485 and Multi-Tariff Support
Class C Active Energy Accuracy
Class C active-energy measurement in accordance with IEC 62053-21 and EN 50470-3.
RS485 Dual-Protocol Communication
Supports Modbus RTU and DL/T 645-2007 protocols, with configurable baud rates from 9600 to 115200 bps.
Flexible CT/VT Ratios
CT and VT ratios are configurable up to 1000:1 for different transformer-operated metering requirements.
Multi-Tariff Energy Management
Supports up to 4 tariffs with RTC-based timekeeping for time-of-use energy measurement and tariff switching.
Internal Battery and RTC Timekeeping
Built-in battery and RTC support reliable clock retention and stable multi-tariff operation during power interruptions.
Applications
Applications and Selection Guidance
EV Charging Metering
Solutions for AC/DC charging, billing and charging platform integration.
Explore ApplicationSolar PV & ESS Metering
DC/PV monitoring for inverters, storage systems and distributed energy monitoring.
Explore ApplicationC&I Sub-Metering
Branch metering for buildings, factories, tenants and energy allocation.
Explore ApplicationIndustrial Plant
Power monitoring for factories, process energy analysis and equipment circuits.
Explore ApplicationTechnical Specifications
Technical Specifications
| Voltage connection | CT / PT |
| Rated voltage | 3 × 230/400 V; 3 × 400 V |
| Frequency | 50/60 Hz |
| Current connection | CT (external current transformer) |
| Rated current | 0.05–5(6) A |
| Start current | 5 mA |
| CT ratio | Up to 1000:1 |
| PT ratio | Up to 1000:1 |
| Power consumption | < 2 W / < 10 VA |
| Pulse constant | 10000 imp/kWh |
| Active energy accuracy | Class C (IEC 62053-21) |
| Communication interface | RS485 |
| Protocol | Modbus RTU and DL/T 645-2007 |
| Communication type | Bidirectional |
| RS485 configuration | Baud rate: 9600 / 19200 / 38400 / 115200 bps |
| LCD display | 6+2 (7+1), auto decimal point shift, blue backlight; 2 buttons for paging and setting |
| Metering function | Measures active/reactive energy, active/reactive power, voltage, current, frequency, power factor, demand and apparent power |
| Metering mode | 1. Total = Forward; 2. Total = Reverse; 3. Total = Forward + Reverse (default); 4. Total = Forward − Reverse |
| Tariff function | 4 tariffs with RTC scheduling |
| CT/PT ratio | CT ratio 1–1000:1; PT ratio 1–1000:1; configurable via RS485/IR and buttons |
| LED indicator | Impulse indication |
| Operating temperature | −40°C to +70°C |
| Average humidity | ≤75% (non-condensing) |
| Maximum humidity | ≤95% |
| Altitude | ≤2000 m |
| IP rating | IP51 indoor |
| Protection class | Class II |
| UC class | UC1 |
| Wiring configuration | Three-phase four-wire (3P4W) and three-phase three-wire (3P3W) |
| Applicable standards | IEC 62053-21:2020 / EN 50470-3:2022 / EN IEC 62052-11:2021/A11:2022 / IEC 62052-31:2024 |
Structure & Dimensions
DEM4K103 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM4K103?
What is DEM4K103?
What connection type does it use?
CT operated with external current transformers. Supports 3P4W and 3P3W (Aron) wiring.
What communication protocols does it support?
RS485 with Modbus RTU and DL/T 645-2007 protocols.
What tariff functions does DEM4K103 provide?
RTC-based 4-tariff metering with time scheduling. For a model without tariff functions, see DEM4K003.
What CT/PT ratios are supported?
CT ratio up to 1000:1 and PT ratio up to 1000:1, configurable via communication interface and buttons.
What is the certification status?
MID B+D certified by SGS UK.
Product Downloads
Product Datasheet Download
Datasheet
DEM4K Series Product Datasheet
Official DEM4K series datasheet covering product overview, specifications, wiring and dimensions.
Download PDF- Product overview and features
- Technical specifications
- Wiring diagrams and dimensions
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