M-Bus System Integration
Supports two-way M-Bus communication in accordance with EN 13757-3 for compatible monitoring systems.
DEM3A204 100 A Three-Phase DIN-Rail Energy Meter with M-Bus
DEM3A204 is a 3P DIN-rail, direct-connected 3P3W (Delta) / 3P4W energy meter rated up to 100 A. It supports two-way M-Bus communication in accordance with EN 13757-3 for compatible monitoring systems, switched tariff input and flexible energy calculation. The meter has no internal battery, RTC or TOU schedule.
Direct connection
3P3W (Delta) / 3P4W
120/208–230/400 V 3-phase rated voltage
100 A Maximum current (Imax)
54 mm DIN-rail width (3 modules)
−40°C to +70°C Operating temperature
Product Highlights
M-Bus three-phase tariff metering
Class 0.5 Active Energy Accuracy
Class 0.5 (Class C) active-energy measurement in accordance with IEC 62053-21 supports reliable energy monitoring and submetering applications.
M-Bus Configuration
Supports model-specific M-Bus addressing (1 to 250), selectable baud rates from 300 to 9600 bps and configurable communication settings for compatible monitoring systems.
Switched Tariff Input
Supports switched tariff input for dual-tariff applications. DEM3A204 has no internal battery, RTC or TOU schedule.
Flexible Energy Calculation
Supports forward, reverse, absolute-value, algebraic-sum and net-energy calculation modes for flexible submetering applications.
Battery-Free Design
No internal battery, RTC or TOU schedule. Supports external switched tariff input only (two tariffs by default). Reduced component count simplifies long-term maintenance.
Applications
Applications and Selection Guidance
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Explore ApplicationTechnical Specifications
Technical Specifications
| Connection type | Direct connection |
| Wire system | 3P3W (Delta) / 3P4W |
| Rated voltage (Un) | 3 × 120/208–230/400 V |
| Voltage tolerance | 0.8 to 1.15 Un |
| Frequency | 50/60 Hz |
| Current connection | Direct connection |
| Basic current (Ib) | 5 A |
| Minimum current (Imin) | 0.15 A (MID) / 0.25 A (IEC) |
| Maximum current (Imax) | 100 A |
| Power consumption | ≤2 W / 10 VA |
| Pulse constant | 1000 imp/kWh |
| Voltage accuracy | ±0.5 % |
| Current accuracy | ±0.5 % |
| Frequency accuracy | ±0.5 % |
| Active power accuracy | ±0.5 % |
| Reactive power accuracy | ±0.5 % |
| Active energy accuracy | Class 0.5 |
| Reactive energy accuracy | Class 1 |
| Communication interface | M-Bus |
| Protocol | M-Bus protocol (EN 13757-3) |
| Communication type | Bidirectional |
| Communication address | 1 to 250 |
| Baud rate | 300 / 600 / 1200 / 2400 / 4800 / 9600 bps |
| Data format | 7 data bits / 1 stop bit / even parity |
| Display and controls | Backlit LCD, 500 ms refresh, page navigation and setting buttons |
| LED indicator | Red pulse LED |
| Metering functions | Energy, power, power factor and harmonic monitoring |
| Energy calculation | Forward, reverse, absolute-value, algebraic-sum and net-energy modes |
| Tariff function | External switched tariff input; default two tariffs |
| Diagnostics and alarms | EEP self-diagnostics and configurable monitoring alarms |
| Other functions | Local firmware upgrade, wiring check, screen saver, page filter and runtime-hour counter |
| Operating temperature | −40°C to +70°C |
| Ingress protection | IP20; install in an IP54 outdoor or IP51 indoor enclosure |
| Overvoltage category | OVC III |
| Protection class | Class II |
| Rated impulse withstand voltage | 6 kV |
| Applicable standards | IEC 62052-11:2020 / IEC 62053-21:2020 / IEC 62053-24:2020 / EN 50470-3:2022 |
Structure & Dimensions
DEM3A204 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM3A204?
DEM3A204 is a 3P DIN-rail, direct-connected energy meter rated up to 100 A with M-Bus communication and switched tariff input. No battery, RTC or TOU.
What communication protocol does DEM3A204 use?
M-Bus protocol in accordance with EN 13757-3, baud rates 300-9600 bps, addresses 1-250.
What tariff functions does DEM3A204 provide?
External switched tariff input with two tariffs by default. No battery, RTC or TOU. For a TOU variant with battery, see DEM3A304.
What metering modes are supported?
Forward, reverse, absolute-value, algebraic-sum and net-energy calculation modes.
What is the operating temperature range?
−40°C to +70°C.
Product Downloads
Product Datasheet Download
Datasheet
DEM3A M-Bus Series Product Datasheet
Official DEM3A M-Bus 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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