PC4713-W-485 meter with blue Power, Net and 485 indicators and three white split-core CT clamps

PC4713-W-485

Three-Phase WiFi + RS485 Smart Energy Meter

For BMS and SCADA racks: 3-phase meter with RS485 Modbus RTU plus HTTP/MQTT over WiFi, 50 ms refresh, DIN rail, 80-750 A CTs.

Smart Meters Three Phase API WiFi RS-485 TCP/IP Modbus

Overview

PC4713-W-485 is the OWON three-phase meter that speaks both a serial bus and the network: RS485 carrying Modbus RTU with a maximum 50 ms response for the control side, and Wi-Fi carrying HTTP, MQTT and Modbus TCP for platform reporting. The two paths are independent, so a local control loop and a cloud feed run from the same instrument.

It is an Open API model, so nothing passes through a vendor cloud and no account is created; the meter is configured from its own browser page. It covers three-phase four-wire, split-phase and single-phase supplies at 90–277 Vac per phase, with bidirectional measurement and three CTs from 80 A to 750 A.

Where the PC4713-W-485 Sits in the Range

RS485 is what separates this model from the PC4713-W; in every other respect — platform, measurement, configuration, CT range — the two are the same meter. Specify the 485 version when a PLC, BMS or SCADA system polls a serial bus, or when a cable is already at the board; the Wi-Fi-only PC4713-W is right when the bus is not part of the design.

Within the wider PC4713 family this is one of the two Open API models. Where the Tuya App is wanted instead of a self-hosted platform, the equivalents are the PC4713-W-E-TY and PC4713-W-E-TY/R. A three-phase three-wire or delta service sits outside the Open API hardware altogether and needs the Tuya-series PC4713-W-E-TY/3W.

PC4713-W-485 Platform and Integration Notes

Open-type CTs, no rewiring. Up to three split-core CTs from 80 A to 750 A clip around the existing conductors: no circuit is cut and no supply is interrupted.

Class B (1%) accuracy, with its bands stated. Voltage ±1%; current ±1% at rated current and ±2% at low current, banded per CT rating — on 300 A and above, ±1% from 6 A upwards, ±2% between 2 A and 6 A, and ±5% below 2 A.

Two measured response times, not one. RS485 answers in a maximum of 50 ms; the Wi-Fi path responds in around 200 ms. A control loop that needs the faster figure belongs on the serial bus.

Settings over the network, either path. Reporting frequency, CT specification, OTA firmware update, data erase and remote reboot are reachable over Wi-Fi or over the RS485 bus, so a fleet can be reconfigured remotely even where only the serial link is used.

Home Assistant integration, in addition to direct polling over Modbus RTU, Modbus TCP, MQTT or HTTP.

PC4713-W-485 Limits and What to Specify Instead

  • Three-phase three-wire and delta — not supported by the Open API hardware. Specify the Tuya-series PC4713-W-E-TY/3W.
  • Relay output — no Open API model carries a dry contact; load switching is a Tuya-series option (PC4713-W-TY/R, PC4713-W-E-TY/R).
  • The Tuya App, Tuya automation and Tuya Cloud history — this model reports to your infrastructure instead.

Specifications

Accuracy±1% (Voltmeters)
Ammeter Accuracy80A CT: ±1% (1-80A), ±2% (0-1A); 120A CT: ±1% (2-120A), ±2% (0-2A); 200A CT: ±1% (2-200A), ±2% (0-2A); 300A CT: ±1% (6-300A), ±2% (2-6A), ±5% (0-2A); 500A CT: ±1% (6-500A), ±2% (2-6A), ±5% (0-2A); 750A CT: ±1% (6-750A), ±2% (2-6A), ±5% (0-2A)
Voltage90~277 Vac 50/60Hz (RMS per phase)
Current80A~750A (CT dependent)
Frequency50/60Hz
Power Supply<2W
ProtocolWiFi 802.11 b/g/n @ 2.4GHz (HTTP / MQTT / Modbus TCP) + RS485 (Modbus RTU)
Wi-Fi802.11 b/g/n @ 2.4GHz — HTTP / MQTT / Modbus TCP
RS485Modbus RTU
Data Refresh50ms
Response Time50ms (RS485); 200ms (WiFi)
Supported SystemsSingle-Phase, Split-Phase, Three-Phase (3P3W & Delta not supported)
Mounting35mm DIN rail mounting
Dimensions19(W) x 69(D) x 90(H) mm
Operating Temp-20℃ to +55℃ (≤90% non-condensing)
Measured ParametersVoltage, Current, Power Factor, Frequency, Active Power, Reactive Power, Apparent Power; Energy Usage / Solar Production
Clamp Inner Dimension80A: Ø10mm; 120A (default): Ø16mm; 200A: Ø20mm; 300A: Ø24mm; 500A: Ø36mm; 750A: Ø51mm
CertificationCE
Place of OriginChina
BrandOWON

Key Benefits

RS485 Modbus RTU and Wi-Fi Together

A wired bus for PLC, BMS and SCADA loops answering in a maximum of 50 ms, with Wi-Fi carrying HTTP, MQTT and Modbus TCP on the same meter.

Four-Quadrant Measurement and Demand

Active, reactive and apparent power in all four quadrants with switchable RMS / PQS, plus current demand and maximum demand.

Direct to Your Cloud, No Vendor Cloud

Reports to your own cloud or local server with no third-party cloud in the path and no account to create.

Configured in a Browser, No App

The meter serves its own configuration page over its hotspot: readings and settings with nothing to install.

Ideal For

Common deployment scenarios where Three-Phase WiFi + RS485 Smart Energy Meter delivers the most value.

Industrial Power Monitoring

RS485 Modbus RTU with 50ms refresh suits industrial SCADA and PLC integration.

EMS / BMS Integration

Modbus RTU/TCP, MQTT and HTTP enable seamless EMS, BMS and automation platform integration.

Solar & Energy Storage

Real-time import/export data for export limitation, zero-export and anti-backflow control.

Commercial & Utility Submetering

CT options 80A-750A cover commercial buildings and utility sub-metering projects.

Direct-to-Cloud Deployments

Report data straight to your own cloud server without a third-party public cloud.

Local-Read Installations

No App needed — connect to the device hotspot and view real-time data in a browser.

Frequently Asked Questions

What is an RS485 energy meter used for?
Industrial power monitoring, EMS and BMS integration, solar PV and energy storage, and SCADA or PLC loops where a reliable Modbus link is required rather than a wireless one.
Which interfaces does the PC4713-W-485 provide?
RS485 carrying Modbus RTU, plus Wi-Fi carrying HTTP, MQTT and Modbus TCP. The RS485 path works independently of the Wi-Fi path, so a local control loop and platform reporting can run from the same meter.
Can PC4713 integrate with EMS and BMS platforms?
Yes. Modbus RTU, Modbus TCP, MQTT and HTTP cover integration with EMS, BMS, SCADA, PLC and industrial automation platforms, and the protocol documents are available for project customers.
Is the PC4713-W-485 suitable for anti-backflow applications?
Yes. It provides real-time import and export energy data for export limitation and zero-export control.
What electrical systems does the PC4713-W-485 support?
Single-phase, split-phase and three-phase four-wire supplies. Three-phase three-wire and delta are not part of the Open API hardware — that service needs the Tuya-series PC4713-W-E-TY/3W.
How fast can it report?
From 1 second: the report_interval setting in device.measure.config has a range of 0 to 3600 seconds, with a default of 10/600. This is the model for integrations that cannot live with a 15-second cycle — a requirement for reporting within 5 seconds is met here.
Which CT rating for a three-phase feeder?
80 to 750 A, with bores of Ø10 / 16 / 20 / 24 / 36 / 51 mm. Non-standard ratings such as 100 A or 150 A start at 100 pieces per rating.
Can the meters be pre-configured to our broker before shipping?
For project orders, yes — a preset broker address and individual credentials per device can be configured before dispatch. Confirm the details with your sales contact before ordering.
What is the difference between a Modbus energy meter and an RS485 energy meter?
RS485 is the physical communication interface, while Modbus RTU is the protocol normally carried over it. In practice the two terms are used interchangeably, because most RS485 energy meters communicate using Modbus RTU.
Does it support TLS, and is the authentication mutual?
Yes. The MQTT link supports TLS/SSL with mutual (mTLS) certificate authentication, not just server-side verification. Mutual authentication activates when both client_cert_file and client_key_file are present — with either one missing it does not activate. Three certificate types are handled: the CA root (ca_file), the client certificate and the client private key; when private or self-signed certificates are used, all three are required.
How do I load and rotate certificates, and is there a size limit?
Upload in chunks through the link.mqtt.security.certificate interface, with cert_type of ca, client_cert or client_key. The device can also pull certificates from your own server by HTTP Range in 1 KB chunks, which is what makes batch distribution, rotation and expiry updates practical; your server validates each request with sign = MD5(request parameters + the device CertKey) and returns 403 if it does not match. Keep each certificate file under 8 KB — a chain with several intermediate certificates, or a long RSA-4096 key, can exceed it, so ECC keys or a trimmed chain are safer.
What should I know before commissioning an encrypted MQTT link?
Two things. The meters own HTTP service supports HTTPS on port 443 with Digest authentication (RFC 7616) by default. And the MQTT configuration is two-stage: set stores the desired configuration, which only takes effect after Apply Current MQTT Configuration — an unapplied configuration is lost on reboot. Note also the boundary: encryption covers MQTT and the device HTTPS service, while Modbus TCP and Modbus RTU over RS485 are not encrypted.

PC4713 Series — choose the right variant

PC4713-WWiFi + open protocol (HTTP / MQTT / Modbus TCP)
PC4713-W-TYWiFi + Tuya Cloud
PC4713-W-TY/R+ dry-contact relay (remote on/off)
PC4713-W-E-TY+ wired Ethernet 10/100
PC4713-W-E-TY/R+ Ethernet + dry-contact relay
PC4713-W-E-TY/3W3-phase 3-wire (3P3W) supplies
PC4713-W-485 — this page+ RS485 Modbus RTU (BMS / SCADA)

Not sure which variant fits your project? See the PC471 selection guide.

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