RS485 Dual Protocol Communication
RS485 communication compatible with Modbus RTU and DL/T 645-2007 dual protocol, with baud rates from 9600 to 115200 bps.
DEM1A102 100 A Single-Phase DIN-Rail Energy Meter with RS485 and Multi-Tariff
DEM1A102 is a 1P DIN-rail, direct-connected single-phase energy meter rated up to 100 A with Class B accuracy. It supports RS485 communication with Modbus RTU and DL/T 645-2007 dual protocol, multi-tariff metering with internal battery for timekeeping, multiple metering modes and demand measurement. MID B+D certified by SGS UK.
DIN-Rail Mounting
1P2W Direct Connection
MID B+D Certified
MID
100 A Maximum current (Imax)
230 V Rated voltage
Class B Active energy accuracy
−25°C to +70°C Operating temperature
Product Highlights
Single Phase DIN Rail Metering with Multifunction Capability
Class B Active Energy Accuracy
Class B active-energy measurement in accordance with EN 50470-3 for reliable submetering and billing applications.
Multiple Metering Modes
Supports 4 metering modes: Forward only, Reverse only, Forward + Reverse (default), and Forward − Reverse.
Full-Parameter Measurement
Measures active/reactive energy and power, voltage, current, power factor, frequency, and forward/reverse demand (15-minute default period).
Touch Button with Blue Backlight
Touch button for page turning and setting, with a blue backlight LCD (5+2) for clear readability.
Multi-Tariff Timekeeping
Internal battery with RTC enables time-based multi-tariff metering for time-of-use billing applications.
Applications
Applications and Selection Guidance
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Explore ApplicationTechnical Specifications
Technical Specifications
| Voltage connection | Direct connection |
| Rated voltage | 230 V |
| Frequency | 50 Hz |
| Current connection | Direct connection |
| Rated current | 0.25–5(30/32/40/45/50/60/80/100) A |
| Start current | 0.004 Ib |
| Impulse constant | 1000 imp/kWh |
| Power consumption | < 12 VA / < 1 W |
| Active energy accuracy | Class B (EN 50470-3) |
| Communication interface | RS485 |
| Protocol | Modbus RTU and DL/T 645-2007 (dual protocol) |
| Communication type | Bidirectional |
| RS485 configuration | Modbus address (1 to 247) Baud rate: 9600 / 19200 / 38400 / 115200 bps Parity: None / Odd / Even Default: 9600, None, 8 data bits, 1 stop bit |
| Display | LCD 5+2 (99999.99 kWh) with blue backlight |
| Metering function | Measures active/reactive energy, active/reactive power, voltage, current, power factor, frequency and demand |
| Metering mode | 1. Total = Forward; 2. Total = Reverse; 3. Total = Forward + Reverse (default); 4. Total = Forward − Reverse |
| Multi-tariff | Multi-tariff function with internal battery for timekeeping |
| Demand function | Forward/reverse active and reactive demand; 1–30 minute period (default 15 minutes) |
| Operating temperature | −25°C to +70°C |
| Average humidity | ≤75% (non-condensing) |
| IP rating | IP51 indoor |
| Wiring configuration | Single-phase two-wire (1P2W), direct connection |
| Applicable standards | EN 50470-1 / EN 50470-3 |
Structure & Dimensions
DEM1A002 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM1A102?
DEM1A102 is a 1P DIN-rail, direct-connected single-phase energy meter rated up to 100 A with Class B accuracy. It supports RS485 communication with Modbus RTU and DL/T 645-2007 dual protocol, multi-tariff metering with internal battery for timekeeping, multiple metering modes and demand measurement. MID B+D certified by SGS UK.
What connection type does it use?
Direct connection, single-phase two-wire (1P2W), rated up to 100 A.
What communication does it support?
RS485 communication with Modbus RTU and DL/T 645-2007 dual protocol.
What tariff functions does it provide?
Multi-tariff metering with internal battery for 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
DEM1A Series Product Datasheet
Official DEM1A 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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