PC471 Selection Guide: Which UniClip or TrioClip Meter Fits Your Site

One hardware platform, eight models, two integration paths — here is how to pick the right one without over-specifying.

Choosing a DIN-rail energy meter usually goes wrong in one of two directions: buying a single-phase unit for a property that has three-phase service, or paying for an integration path that the project will never use. The OWON PC471 is a 19 mm DIN-rail energy meter family that measures through open-type split-core CT clamps — one housing, one accuracy class, one metering feature set — and it is wide at the same time: single-phase and three-phase, up to 750 A, from an app-based setup to a fully headless Open API. Eight models are compared here; the CT clamps are chosen separately, by bore and rating.

One decision sits outside the feature tables entirely, so it is worth stating before anything else: a three-phase three-wire (3P3W) site has no neutral, and that makes it a hardware choice rather than a configuration choice. Only one standard model covers it.

The models compared here: five Tuya models and three Open API models. The classification drawings carry OWON’s own colour code — a blue tab for a three-phase clamp, a green tab for a single-phase clamp, a white body for the Tuya platform and a grey body for the Open API platform.

The decisions that sit around the model number have their own companion guides: CT sizing for bores, ratings and non-standard orders, the Tuya Cloud versus Open API choice for where the data lands, and wiring and commissioning for the site work.

Quick answer: four steps to a model number

If you only read one thing, read this. The four questions below eliminate models in order — system type, CT fit, data destination, then whether you need to switch a load.

Four steps, in this order. Step 3 is the fork that matters most: it decides between the Tuya Cloud and your own cloud.

Model comparison at a glance

A compact side-by-side of the eight models this guide covers — the 3P3W build is one of them. The row-grouped matrix below adds every remaining specification.

Relay and phase-sequence alarm are the two features that separate otherwise identical models. Among the models covered here, the relay (3 A rated / 5 A max) is fitted only to the two whose part number ends in /R — PC4711-W-E-TY/R and PC4713-W-E-TY/R — and the phase-sequence alarm appears on every three-phase model, the 3P3W build included — it is the relay that the 3P3W build does without.

One availability note before the tables: the two single-phase Open API models — PC4711-W and PC4711-W-485 — are the newest additions to the line and are coming soon, while the three-phase Open API models ship today. The integration guide covers what that means for a project plan.

Also in the family, outside these tables. The platform runs on past the eight models compared here: further single-phase variants include PC4711-W-TY/R (relay output, no Ethernet), PC4711-W-TY/3CT (three independent single-phase circuits in one 19 mm unit — three single-phase loads, not a three-phase service) and PC4711-W (Open API over Wi-Fi only, no RS485 port). They follow the same single-phase electrical envelope: 90–277 V, bidirectional metering, 20–300 A CTs. Ask your sales contact for the current part-number list when a project needs a combination that is not in the tables above.

Full specification matrix: all eight models

This is the complete comparison of the models covered here — the published specifications that decide a selection. It is wide by design; scroll it sideways on a phone.

Series and identity

System and power

Current transformers

Metering

Connectivity and integration

report_interval is the meter’s own setting, quoted in the product data as range 0 to 3600 seconds with a default written 10/600; set it to 1 for one-second reporting. The Tuya models have no equivalent — their cycle is set by the platform. | Link encryption | Platform-managed | Platform-managed | Platform-managed | Platform-managed | Platform-managed | MQTT over TLS/SSL · mutual mTLS optional · Modbus unencrypted | same | same | | Relay (dry contact) | — | 3 A rated / 5 A max, overload protection | — | 3 A rated / 5 A max, overload protection | — | — | — | — | | Phase sequence alarm | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | — | | Remote management | Data erase · reboot · CT setting | + relay on/off | + phase sequence alarm | + relay on/off | Data erase · reboot · CT setting | OTA · data erase · reboot · CT setting | OTA · data erase · reboot · CT setting | OTA · data erase · reboot · CT setting | | App required | Tuya App (or Home Assistant) | Tuya App (or Home Assistant) | Tuya App (or Home Assistant) | Tuya App (or Home Assistant) | Tuya App (or Home Assistant) | No — browser config | No — browser config | No — browser config | | Home Assistant | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Automation scenes | Tuya scenes | Tuya scenes | Tuya scenes | Tuya scenes | Tuya scenes | Platform-side | Platform-side | Platform-side |

Physical

Where the printed guide differs from this table. The family comparison table in the selection guide prints the single-phase CT row as 80 / 120 / 200 / 300 A, while the individual PC4711-W-485 page prints the wide three-phase range with “6 options” — in both places the three-phase line has been carried across onto a single-phase row. The confirmed split is 20–300 A on single-phase, 80–750 A on three-phase: single-phase builds run from a 20 A clamp, and the 300 A / Ø24 mm clamp is the top of that line. 3P3W is the other exception: only PC4713-W-E-TY/3W is specified for it, and the rest of the three-phase line is four-wire hardware — see the 3P3W note. Demand metering (current demand and maximum demand) is an option on all three Open API models — PC4713-W, PC4713-W-485 and PC4711-W-485; the Tuya models do not offer it.

The family in one picture

Eight models — five Tuya and three Open API — split into two product lines and named by two silhouettes:

Two things are true across all of them:

• Open-type CT, non-intrusive. Every model clips CT clamps around existing cables. No rewiring, no power cut, interchangeable CTs.
• Physical commonality. 35 mm DIN rail, 19 × 69 × 90 mm, voltage range 90–277 V, accuracy V ±1% / I ±1% (rated) and ±2% (low), operating environment −20 °C ~ +55 °C at ≤ 90 % RH.

What differs is how many phases you can measure, how many CTs you can fit, whether there is a relay, and — most importantly — where the data goes.

The four site questions

Two of the four questions are answered by the site itself, not by the datasheet — whether the clamp physically fits the cable, and how much current actually flows. Those two live in the CT sizing guide. The other two are below, and together they settle the model number before any table matters.

1. Single-phase or three-phase?

• Single-phase service → single-phase meters: PC4711-W-TY, PC4711-W-E-TY/R, PC4711-W-485. Nominal 230 V AC, 50/60 Hz, up to 2 CTs.
• Three-phase, split-phase or single-phase → three-phase meters: the PC4713 family. Nominal 3×230/400 V AC, 50/60 Hz, up to 3 CTs.

A three-phase meter can be used on a single-phase or split-phase installation — that is explicit in the specification for every PC4713 model. The reverse is not true: a PC4711 cannot measure a three-phase system.

How the CTs connect. The terminal layout, the CT polarity pairs (IA+ / IA−, IB+ / IB−, IC+ / IC−), the arrow-towards-the-loads rule and the supply/CT phase rule are identical across the family and are covered with the wiring diagram in Wiring and commissioning the PC471. For selection, only the count matters: 2 CTs on the single-phase line, 3 on the three-phase line — or 2 when a PC4713-W-E-TY/3W is wired for 3P3W, where the middle phase current is derived.

2. Do you need to switch a load, not just measure it?

Among the models covered here, only the two /R models carry a built-in dry-contact relay: 3 A rated / 5 A maximum, with overload protection, and report relay status instantly. That is the PC4711-W-E-TY/R (UniClip Pro) and PC4713-W-E-TY/R (TrioClip Pro). Everything else in these tables — including the 3P3W build and all three Open API models — carries no relay. Note that this is a separate question from the phase-sequence alarm: every three-phase model raises that alarm, the single-phase models do not.

The relay is a dry contact rated 3 A / 5 A — it is a control output, not a main contactor. Treat it as a signal for a contactor, a heat-pump enable input or a small auxiliary load.

How the PC471 compares with typical market designs

Most meters in this class look similar on a datasheet: DIN rail, open-type CT, Wi-Fi, an app. The differences that decide whether a project succeeds — or has to be re-specified six months in — sit in a handful of places. The table below is written so you can put a specific competitor next to it and see where the gap is.

The gap is not in the headline specification — it is in what happens after the pilot. A meter that only reports leaves you to build the rest: a cloud account you may not be allowed to use, a control loop that has no output to switch, a low-current reading that drifts on real loads, a wireless link that fails with no wired fallback. Those are the functions that were added to the PC471 over successive iterations, and several of them are still absent from comparable meters on the market:

• It talks to your platform directly. The Open API models report to your own cloud or local server with no third-party cloud in the path — and they still integrate with Home Assistant.
• The configuration interface is a web browser, not an app. On the Open API models you connect to the meter’s own AP hotspot and configure everything from the browser — reporting frequency, CT specification, OTA, data erase, remote reboot — with no app to install and no cloud account to create.
• Every integration method is exposed on the same device. HTTP, MQTT and Modbus TCP over Wi-Fi, plus Modbus RTU over RS485 — so the protocol can be benchmarked on site and changed without new hardware.
• It can act, not only measure. A dry-contact relay rated 3 A resistive / 5 A max can switch a small load directly, or drive an external contactor to control a large load or a whole three-phase circuit, with relay status reported instantly. On a three-phase line the relay is optional.
• The accuracy class is declared and the bands are published: Class B (1%) — the declared accuracy class of a monitoring meter, i.e. readings within ±1% at rated current — with the current band stated per CT rating instead of one blanket percentage for the whole range.
• It measures more than energy: four-quadrant metering with switchable RMS / PQS modes, and current demand / maximum demand in addition to active, reactive and apparent energy.
• One device, several circuits: three CT channels on the three-phase models, and up to two independently measured circuits or loads on a single-phase PC4711.

The market-design column is deliberately generic. We are not naming a competitor or quoting their measured numbers: those rows describe common design choices, and any head-to-head figure should come from an engineering-verified comparison sheet.

A seven-point checklist for your own shortlist

When you benchmark the PC471 against another option, put both through these seven questions in this order. It separates engineering from marketing faster than any datasheet:

1. Width and module count — how many DIN modules per meter, and how many circuits fit in the panel you already have?
2. Accuracy class and low-current behaviour — is an accuracy class stated, and what does the meter read at 1 A and at 0.5 A?
3. Calibration load type — calibrated on resistive load only, or also on capacitive and non-linear loads?
4. Second communication path — if Wi-Fi fails on site, what is the fallback that does not require new hardware?
5. Protocol options — one fixed integration method, or several you can test and change?
6. Can it act, not just measure? — is there a relay output that can drive a contactor, and is relay status reported?
7. How many circuits does one device meter? — a single metering point, or several independent CT channels?

Checklist item 7 is also one of the questions that comes up in real pre-sales conversations:

“Can I monitor three phases separately and still see the total?” Yes. The three-phase models take three CTs, one per phase, so L1 / L2 / L3 are metered individually and summed. On a single-phase service the PC4711 supports up to two circuits or loads measured independently.

Where each model tends to land

• Single-phase home or apartment, app-first owner → PC4711-W-TY (UniClip Lite). Two CTs, 20–300 A, live data in the Tuya App.
• Single-phase site that must switch a load remotely → PC4711-W-E-TY/R (UniClip Pro). Adds the dry-contact relay and Ethernet fallback.
• Whole-home three-phase monitoring for an app user → PC4713-W-TY (TrioClip Lite). Three CTs up to 750 A, phase-sequence alarm.
• Three-phase with load control and dual network → PC4713-W-E-TY/R (TrioClip Pro). The full suite: relay, Ethernet backup, phase alarm.
• Three-phase three-wire (3P3W, no neutral) → PC4713-W-E-TY/3W. The only standard model specified for the higher phase-to-phase input (L-N 90–277 / L-L 156–480 Vac); the rest of the three-phase line is four-wire hardware.
• Three-phase feeding your own platform over Wi-Fi → PC4713-W (TrioClip Open). HTTP / MQTT / Modbus TCP, 50 ms refresh, no third-party cloud.
• Three-phase with a wired BMS / EMS loop → PC4713-W-485. Adds Modbus RTU over RS485 at max 50 ms response.
• Single-phase sub-metering on a wired bus → PC4711-W-485 (UniClip Open) — coming soon; confirm availability with your sales contact before designing around it.