DL/T 645 + Modbus RTU
RS485 carries DL/T 645 and Modbus RTU at up to 115200 bps for EV charging and DC energy-management integration.
Product
DEM2D003 DC DIN-Rail Energy Meters (External Shunt)
DIN-rail DC energy meter with external 75 mV shunt and 9–60 V DC auxiliary supply for EV charging.
DIN-Rail Mounting
External Shunt (75 mV)
Up to 2000 A 75 mV external shunt
9–60 V DC Auxiliary power supply
36 mm DIN-rail width (2P)
−25°C to +70°C Operating temperature
Product Highlights
DC Metering with External Shunt and DC Auxiliary Power
Class 1.0 Active Energy Accuracy
Class 1.0 active energy accuracy for reliable DC energy measurement and monitoring in EV charging applications.
External Shunt Flexibility
75 mV external shunt sampling supports primary-side currents up to 2000 A with configurable current settings, enabling flexible current-range configuration for different DC charging power levels.
6.4 kV Impulse, 4400 V AC/min
6.4 kV 1.2/50 μs impulse and 4400 V/min AC withstand harden the meter for EV charging and DC distribution.
6+2 LCD Display
6+2-digit LCD displays DC energy, voltage, current and power for clear on-site monitoring.
Overcurrent Alarm, Red Backlight
Backlight turns red on overcurrent for immediate visual fault indication in DC metering.
Applications
Applications and Selection Guidance
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Explore ApplicationTechnical Specifications
Technical Specifications
| Voltage connection | DC 5–1000 V |
| Current connection | External shunt (75 mV) |
| Maximum current | 2000 A (75 mV shunt; 200 A default) |
| Auxiliary power supply | 9–60 V DC |
| Impulse constant | 1000 imp/kWh |
| Power consumption | ≤8 VA / ≤0.4 W |
| Active energy accuracy | Class 1.0 |
| Current accuracy | 0.5% |
| Voltage accuracy | 0.5% |
| Active power accuracy | 1.0% |
| Communication interface | RS485 |
| Protocol | DL/T 645, Modbus RTU |
| Baud rate | up to 115200 bps (default) |
| Display | LCD 6+2 |
| Overcurrent alarm | Backlight turns red |
| AC withstand voltage | 4400 V/min |
| Impulse withstand voltage | 6.4 kV 1.2/50 μs |
| Installation | 35 mm DIN rail, 2-module |
| Operating temperature | −25°C to +70°C |
| Humidity | ≤95% |
Structure & Dimensions
DEM2D003 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM2D003?
DIN-rail DC energy meter with external 75 mV shunt and 9–60 V DC auxiliary supply for EV charging.
What current range does it support?
External shunt sampling at 75 mV, supporting a primary-side current up to 2000 A (200 A default).
What communication protocols does it support?
RS485 supports DL/T 645 and Modbus RTU dual protocols at up to 115200 bps.
What is the accuracy?
Class 1.0 active energy accuracy, with 0.5% current and voltage accuracy and 1.0% active power accuracy.
What auxiliary power supply does it use?
9–60 V DC
Does DEM2D003 support a battery, multi-tariff functions or relay output?
No. DEM2D003 does not include an internal battery, multi-tariff functions or relay output. For these functions with a 9–60 V DC auxiliary supply, consider DEM2D103. DEM2D102 offers the additional functions with an 85–265 V AC/DC auxiliary supply.
Product Downloads
Product Datasheet Download
Datasheet
DEM2D Series Product Datasheet
Official DEM2D 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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