SO Pulse Output + Signal Input
1-channel SO pulse output for kWh with variable pulse constant, plus an external signal input port for extended monitoring.
DEM4A30B 100 A Three-Phase DIN-Rail Energy Meter with RS485, Multi-Tariff, SO Output and Signal Input
DEM4A30B is a 3P DIN-rail, direct-connected three-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, 1-channel SO pulse output with variable pulse constant, an external signal input port, and multi-tariff metering (4 tariffs) with internal battery for timekeeping. MID B+D certified by SGS UK.
DIN-Rail Mounting
3P4W Direct Connection
MID B+D Certified
MID
100 A Maximum current (Imax)
3×230/400 V Rated voltage
Class B Active energy accuracy
−40°C to +70°C Operating temperature
Product Highlights
Three 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.
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.
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, frequency, power factor and maximum demand across all three phases.
Multi-Tariff + Signal Input
Combines 4-tariff time-of-use billing with an external signal input port for the most flexible metering configuration.
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Explore ApplicationTechnical Specifications
Technical Specifications
| Voltage connection | Direct connection |
| Rated voltage | 3 × 230/400 V ±20% |
| Frequency | 50 Hz |
| Current connection | Direct connection |
| Rated current | 0.25–5(30/32/40/45/50/60) A; 0.25–10(80/100) A |
| Start current | 0.004 Ib |
| Pulse constant | 1000 imp/kWh (LED); 1000 imp/kvarh (LED) |
| Power consumption | ≤12 VA, < 1 W |
| Active energy accuracy | Class B (EN 50470-3) |
| Communication interface | IR + RS485 |
| 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 |
| IR port | Infrared (IR) communication for local reading |
| LCD display | 6+2, scrolling display |
| Metering function | Measures active/reactive energy, active/reactive power, voltage, current, frequency, power factor and maximum demand |
| Metering mode | 1. Total = Forward; 2. Total = Reverse; 3. Total = Forward + Reverse (default); 4. Total = Forward − Reverse |
| SO pulse output | 1-channel SO output for kWh with variable pulse constant |
| External signal input | 1 external signal input port (no high-voltage input) |
| Demand function | Interval / slip type, period 1–30 minutes (default 15 minutes) |
| Multi-tariff | 4 tariffs with RTC scheduling; internal battery for timekeeping |
| Pulse width | Changeable pulse width according to current; the higher the current, the shorter the pulse width |
| Operating temperature | −40°C to +70°C |
| Average humidity | ≤75% (non-condensing) |
| IP rating | IP51 indoor |
| Protection class | Class II |
| Wiring configuration | Three-phase four-wire (3P4W) |
| Applicable standards | EN 50470-1 / EN 50470-3 |
Structure & Dimensions
DEM4A30B Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DEM4A30B?
DEM4A30B is a 3P DIN-rail, direct-connected three-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, 1-channel SO pulse output with variable pulse constant, an external signal input port, and multi-tariff metering (4 tariffs) with internal battery for timekeeping. MID B+D certified by SGS UK.
What connection type does it use?
Direct connection, three-phase four-wire (3P4W), rated up to 100 A.
What SO pulse output does it provide?
1-channel SO output for kWh with variable pulse constant, plus an external signal input port.
What tariff functions does it provide?
4-tariff time-of-use billing with internal battery for RTC timekeeping.
What communication does it support?
RS485 communication with Modbus RTU and DL/T 645-2007 dual protocol.
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
DEM4A Series Product Datasheet
Official DEM4A 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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