≤75 ms Communication Refresh
Specified RS485 communication refresh time of ≤75 ms for applications requiring timely meter-side data updates.
DEM2A202 100 A Single-Phase DIN-Rail Energy Meter with RS485
DEM2A202 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, a specified RS485 communication refresh time of ≤75 ms and externally switched dual-tariff operation. It has no internal battery, RTC or TOU scheduling and 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
Class 0.5 Active Energy Accuracy
Class 0.5 active-energy measurement in accordance with IEC 62053-21 and Class 1 reactive-energy measurement in accordance with IEC 62053-23.
RS485 Dual Protocol Communication
RS485 communication compatible with Modbus RTU and DL/T 645-2007 protocols, with configurable baud rates from 9.6 to 115.2 kbps and addresses from 1 to 247.
External Dual-Tariff Switching
Supports external switching between two default tariffs without battery-backed RTC or time-scheduled TOU functions.
Full-Parameter Measurement
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 |
| Frequency | 50/60 Hz |
| Basic current | 5 A |
| Minimum current | 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 | ±0.5% |
| Current | ±0.5% |
| Frequency | ±0.5% |
| Active power | ±0.5% |
| Reactive power | ±1% |
| Active power accuracy | Class 0.5 |
| Reactive power 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 | Switching dual-tariff metering; no battery, RTC or TOU tariff function |
| 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
DEM2A202 Dimensions & Wiring
Dimensions
Wiring
FAQ
DEM2A202 FAQ
Is DEM2A202 MID certified?
Yes. DEM2A202 is MID certified. Verify the applicable model scope on the YTL Certificates page or contact YTL for documentation.
Which protocols are supported by DEM2A202?
DEM2A202 supports RS485 communication with Modbus RTU and DL/T 645-2007 compatibility.
What does ≤75 ms mean on DEM2A202?
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?
No. DEM2A202 is the no-battery variant with switching dual-tariff metering; it does not include RTC or TOU tariff functions.
What is the wiring method for DEM2A202?
DEM2A202 uses direct 1p2w wiring. Follow the official model-specific wiring diagram and terminal markings.
What applications is DEM2A202 suitable for?
DEM2A202 is suitable for solar PV, BESS, EV charging, building and industrial energy-monitoring projects using compatible RS485 systems.
Product Datasheet Download
DEM2A Series Datasheet
Request the DEM2A series datasheet, model-selection support and applicable product documentation for your project.
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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