≤75 ms Communication Refresh
Specified RS485 communication refresh time of ≤75 ms for applications requiring timely meter-side data updates.
DEM2A302 100 A Single-Phase DIN-Rail Energy Meter with RS485 and TOU
DEM2A302 is a single-phase, direct-connected DIN-rail energy meter for 1P2W systems, with a maximum current of 100 A. It supports RS485 communication with Modbus RTU and DL/T 645-2007 compatibility and a specified RS485 communication refresh time of ≤75 ms. Four TOU tariffs across eight time periods, external tariff switching and battery-backed RTC timekeeping are provided. The model is MID B+D certified by SGS UK.
DIN-Rail Mounting (2P (36 mm))
1P2W Direct Connection
MID B+D Certified
MID
100 A Maximum current (Imax)
120–230 V Rated voltage
Class 0.5 Active energy accuracy
-40°C to +70°C Operating temperature
Product Highlights
100 A RS485 Metering with Fast Data Refresh and TOU
Class 0.5 Active Energy Accuracy
Class 0.5 active-energy measurement supports reliable monitoring and submetering applications.
RS485 with Dual Protocol
Supports two-way RS485 communication compatible with Modbus RTU and DL/T 645-2007 for integration with compatible monitoring systems.
100 A Direct-Connected Metering
Supports single-phase 1P2W direct connection with a maximum current of 100 A, without requiring an external CT.
Flexible Energy Calculation
Supports forward, reverse, absolute-value, algebraic-sum and forward/reverse offset energy calculation modes.
Monitoring & Alarms
Measures key electrical parameters and provides EEP self-diagnosis and configurable alarms with adjustable thresholds and delays.
Applications
Applications and Selection Guidance
EV Charging Metering
Solutions for AC/DC charging, billing and charging platform integration.
Explore ApplicationSolar PV & ESS Metering
DC/PV monitoring for inverters, storage systems and distributed energy monitoring.
Explore ApplicationC&I Sub-Metering
Branch metering for buildings, factories, tenants and energy allocation.
Explore ApplicationData Center Energy Metering
Rack, cabinet and distribution power monitoring for data center operations.
Explore ApplicationTechnical Specifications
Technical Specifications
| Connection type | Direct-connected, 1P2W |
| Meter format | Single-phase, 2P DIN-rail |
| Rated voltage | 120–230 V AC |
| Operating voltage range | 0.8–1.15 Un |
| Basic current (Ib) | 5 A |
| Minimum current (Imin) | 0.15 A (MID) / 0.25 A (IEC) |
| Maximum current (Imax) | 100 A |
| Rated frequency | 50/60 Hz |
| 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 | ±1% |
| Active energy accuracy | Class 0.5 |
| Reactive energy accuracy | Class 1 |
| Communication method | RS485 |
| Supported protocols | Modbus RTU and DL/T 645-2007 compatibility |
| Specified communication refresh | ≤75 ms (RS485 communication refresh condition only) |
| Fast Data Refresh | Applies to the specified RS485 communication refresh only; it is not waveform sampling rate or system latency. |
| Tariff function | Built-in RTC and TOU tariff metering; four tariffs and eight time periods by default |
| Dimensions | 36 × 94 × 62.4 mm |
| DIN rail | 35 mm standard DIN rail |
| Operating temperature | -40°C to +70°C |
| Humidity | ≤95%, non-condensing |
| Altitude | ≤2000 m |
| Protection rating | IP20 |
| Protective class | Class II |
| Overvoltage category | III |
| Rated impulse withstand voltage | 6 kV |
| Applicable standards | IEC 62052-11:2020, IEC 62053-21:2020, IEC 62053-24:2020 and EN 50470-3:2022 |
Structure & Dimensions
DEM2A302 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
Is DEM2A302 MID certified?
Yes. DEM2A302 is MID certified. Verify the applicable model scope on the YTL Certificates page or contact YTL for documentation.
Which protocols are supported by DEM2A302?
DEM2A302 supports RS485 communication with Modbus RTU and DL/T 645-2007 compatibility.
What does ≤75 ms mean on DEM2A302?
It is the specified RS485 communication refresh time. It is not waveform sampling rate, system latency or control-loop response time.
Does it include RTC and TOU tariff functions?
Yes. DEM2A302 includes RTC and TOU tariff metering with four tariffs and eight time periods by default.
What is the wiring method for DEM2A302?
DEM2A302 uses direct 1p2w wiring. Follow the official model-specific wiring diagram and terminal markings.
What applications is DEM2A302 suitable for?
DEM2A302 is suitable for solar PV, BESS, EV charging, building and industrial energy-monitoring projects using compatible RS485 systems.
Product Downloads
Product Datasheet Download
Datasheet
DEM2A Series Product Datasheet
Official DEM2A 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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