SO Pulse Output
SO output for active kWh with configurable pulse constant (default 1000).
DEM4B803 80 A Three-Phase DIN-Rail Energy Meter with RS485, RTC and Multi-Tariff
DEM4B803 is a 3P DIN-rail, direct-connected three-phase energy meter rated up to 80 A with Class 1.0 (Class B) accuracy. It supports RS485 communication with Modbus RTU and DL/T 645-2007 compatibility, RTC-based multi-tariff metering (4 tariffs), SO pulse output with variable pulse constant and power outage display. MID B+D certified by SGS UK.
DIN-Rail Mounting
3P4W Direct Connection
MID B+D Certified
MID
80 A Maximum current
3×230/400 V Rated voltage
Class 1.0 Active energy accuracy
−25°C to +70°C Operating temperature
Product Highlights
Built for certified, flexible three-phase submetering
Class 1.0 Active Energy Accuracy
Class 1.0 (Class B) active-energy measurement in accordance with EN 50470-3 and IEC 62053-21.
RS485 Communication
RS485 communication with Modbus RTU and DL/T 645-2007 protocols. Baud rate configurable from 9600 to 115200 bps.
Multiple Metering Modes
Supports 4 metering modes: Forward only, Reverse only, Forward + Reverse (default), and Forward − Reverse.
MID B+D Certified by SGS UK
MID B+D certified, confirming accuracy and quality for sub-billing applications across the EU.
RTC and Multi-Tariff Timekeeping
Internal RTC enables time-of-use billing with 4 tariffs and 8 time periods.
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Explore ApplicationTechnical Specifications
Technical Specifications
| Voltage connection | Direct connection |
| Rated voltage | 3 × 230/400 V |
| Frequency | 50/60 Hz |
| Current connection | Direct connection |
| Rated current | 0.25–5(80) A |
| Start current | 0.4% (20 mA) |
| Pulse constant | 1000 imp/kWh |
| Power consumption | ≤2 W / 10 VA |
| Active energy accuracy | Class 1.0 / Class B (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), scrolling display; voltage, current, energy, power, frequency |
| Multi-tariff | RTC-based 4 tariffs |
| Operating temperature | −25°C to +70°C |
| Relative humidity | ≤95% |
| Altitude | ≤2000 m |
| IP rating | IP51 indoor |
| Protection class | Class II |
| UC class | UC2 |
| Wiring configuration | Three-phase four-wire (3P4W) |
| Applicable standards | EN 50470-3:2022 / EN IEC 62052-11:2021/A11:2022 / IEC 62052-31:2015 |
Structure & Dimensions
DEM4B803 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM4B803?
DEM4B803 is a 3P DIN-rail, direct-connected three-phase energy meter rated up to 80 A with Class 1.0 (Class B) accuracy. It supports RS485 communication with Modbus RTU and DL/T 645-2007 compatibility, RTC-based multi-tariff metering (4 tariffs), SO pulse output with variable pulse constant and power outage display. MID B+D certified by SGS UK.
What connection type does it use?
Direct connection, three-phase four-wire (3P4W).
What communication protocols does DEM4B803 support?
RS485 communication with Modbus RTU and DL/T 645-2007 protocols. Baud rate configurable from 9600 to 115200 bps.
What tariff functions does DEM4B803 provide?
RTC-based multi-tariff metering with 4 tariffs. This is the only DEM4B variant with RTC timekeeping.
What metering modes are supported?
Forward, Reverse, Forward + Reverse (default), and Forward − Reverse.
What is the certification status?
MID B+D certified by SGS UK.
Product Downloads
Product Datasheet Download
Datasheet
DEM4B Series Product Datasheet
Official DEM4B 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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