Class 0.5S Active Energy Accuracy
Class 0.5S (IEC 62053-22) active-energy measurement with ±0.2 % voltage and current accuracy supports high-precision power monitoring for distribution applications.
YTL72-320D 72 mm Panel-Mount Multifunction Power Meter with RS485, Y-Bus and DI/DO
YTL72-320D is a 72 mm panel-mount multifunction digital power meter with dot-matrix LCD display. It supports CT input at 5(6) A, three-phase high-accuracy measurement (Class 0.5S), dual communication architecture (RS485 + Y-Bus), 4 digital inputs, 2 digital outputs, SOE event records and 10-type event alarms. Y-Bus enables external sensor connectivity for temperature and humidity monitoring.
Panel Mount Design
3P4W / 3P3W (ARON)
5(6) A CT input rating
72 × 72 mm Frame size
RS485 + Y-Bus Communication interface
−40°C to +70°C Operating temperature
Product Highlights
Built for clear, connected panel metering
RS485 Dual Protocol Communication
RS485 communication compatible with Modbus RTU and DL/T 645-2007 protocols. Default 115200 bps, 2-wire connection, supports up to 64 devices. Communication response time ≤100 ms.
Y-Bus External Sensor Connectivity
Y-Bus interface supports up to 5 downstream sensors for temperature and humidity monitoring. Default 9600 bps, Modbus protocol. Enables comprehensive environmental and electrical monitoring in a single device.
Digital I/O and SOE Event Records
4 dry-contact digital inputs with built-in power supply (response < 300 ms) and 2 digital outputs (NO contacts, AC 250 V/5 A). SOE event records with millisecond timestamps capture electrical parameters when DI/DO is triggered.
10-Type Event Alarms
Supports alarms for current imbalance, overcurrent, overload, overvoltage, undervoltage, low battery, voltage imbalance, phase-sequence error, low power factor and voltage/current circuit faults.
Compact 72 mm Frame Design
72 × 72 mm panel-mount frame with 66 × 66 mm cutout. Dot-matrix LCD with white backlight. Panel IP54, operating temperature −40°C to +70°C.
Applications
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.
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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
| Voltage connection | Direct / PT |
| Rated voltage | AC 3×57.7/100 V, AC 3×63.5/110 V, AC 3×230/400 V |
| Voltage tolerance | 0.8 to 1.15 Un |
| Current connection | CT |
| Basic current (Ib) | 5 A |
| Minimum current (Imin) | 0.05 A |
| Maximum current (Imax) | 6 A |
| Operating frequency | 50 Hz / 60 Hz |
| Meter constant | 10000 imp/kWh, 10000 imp/kvarh |
| Auxiliary power supply | AC 85–276 V, DC 95–350 V |
| Power consumption | ≤1 VA per phase; auxiliary ≤2 W, ≤10 VA |
| Voltage accuracy | ±0.2 % |
| Current accuracy | ±0.2 % |
| Frequency accuracy | ±0.02 Hz |
| Active power accuracy | ±0.5 % |
| Reactive power accuracy | ±2 % |
| Active energy accuracy | Class 0.5S (IEC 62053-22) |
| Reactive energy accuracy | Class 2 |
| Voltage / current harmonic accuracy | ±1 % |
| Communication interface | RS485 + Y-Bus |
| Y-Bus communication | Y-Bus proprietary protocol for external sensor connectivity |
| Y-Bus configuration | Default: 9600 bps, 8 data bits, 1 stop bit, no parity; supports up to 5 downstream sensors |
| Protocol | RS485 compatible with Modbus RTU and DL/T 645-2007; Y-Bus supports Modbus protocol |
| Communication type | Bidirectional |
| RS485 configuration | Default: 115200 bps, 8 data bits, 2 stop bits, no parity; 2-wire; max. 64 connections |
| Communication response time | ≤100 ms |
| LCD display | Dot-matrix LCD (D), white backlight; menu key, left key, right key, confirm key |
| Metering function | Full parameter measurement: voltage, current, energy, power, power factor and demand |
| Metering mode | Absolute-value, algebraic-sum and separate import/export metering |
| Digital inputs | 4 dry-contact inputs; built-in power supply; response time < 300 ms |
| Digital outputs | 2 digital outputs; normally open contacts; AC 250 V / 5 A, DC 30 V / 5 A |
| SOE records | SOE event records with millisecond timestamps; records electrical parameters when DI/DO is triggered |
| Event alarms | Current imbalance, overcurrent, overload, overvoltage, undervoltage, low battery, voltage imbalance, phase-sequence error, low power factor, voltage/current circuit fault |
| Firmware upgrade | Local upgrade |
| Panel IP rating | IP54 |
| Housing IP rating | IP20 |
| Protection class | Class II |
| Wiring method | 3P4W, compatible with 3P3W (ARON) |
| Altitude | < 2000 m |
| Impulse withstand voltage | 6 kV |
| Frame size | 72 × 72 mm |
| Housing dimensions | 65.3 × 65.3 × 80.5 mm |
| Cutout dimensions | 66 × 66 mm |
| Applicable standards | GB/T 17215.211:2021 / GB/T 17215.321:2021 / IEC 62052-11:2020 / IEC 62053-22:2020 / IEC 61557-12:2021 |
Structure & Dimensions
YTL72-320D Wiring & Dimensions
Wiring
Dimensions
FAQ
Product FAQ
What is YTL72-320D?
What is YTL72-320D?
What frame sizes are available?
YTL72 series uses a 72×72 mm frame (cutout 66×66 mm). YTL96 series uses a 96×96 mm frame (cutout 86×86 mm). The 96 frame also supports AC 3×400/690 V rated voltage.
What communication protocols does it support?
RS485 supports Modbus RTU and DL/T 645-2007 protocols with a response time of ≤100 ms.
What is Y-Bus communication?
Y-Bus is a proprietary communication protocol developed by YTL, supporting up to 5 downstream sensors for temperature and humidity monitoring. Default 9600 bps, Modbus protocol.
What digital I/O functions are available?
4 dry-contact digital inputs (response < 300 ms) and 2 digital outputs (NO contacts, AC 250 V/5 A, DC 30 V/5 A). SOE event records with millisecond timestamps capture electrical parameters.
Product Downloads
Product Datasheet Download
Datasheet
YTL-72 Series Product Datasheet
Official YTL-72 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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