PC321-W/3W Single/Three-Phase WiFi MQTT Smart Energy Clamp
PC321-W/3W
Open-protocol WiFi smart energy clamp for single, split and three-phase systems (incl. 3P3W). MQTT & HTTP API with direct-to-cloud reporting — no third-party cloud required. Three CT clamps up to 750A, bidirectional measurement for solar PV.
Overview
PC321-W/3W helps you monitor the amount of electricity Consumed and Produced in your three-phase power system by connecting the clamps on to the power cables. It is also compatible with split-phase and single-phase. The real-time data can be reported directly to your cloud server without going through a third-party public cloud.
Key Features
- Supports Wi-Fi 2.4GHz wireless communication, MQTT API provided.
- External magnetic antenna can avoid shielding of wireless signals by metal distribution boxes
- Three-Phase (included 3P3W), Split-Phase and Single-Phase electricity system compatible
- Remotely monitor whole home Energy with three current transformers
- Real-time Voltage, Current, PowerFactor, Frequency, ActivePower measurement
- Bidirectional measurement: Energy Usage / Solar Production
Specifications
| Accuracy | ±1% (Voltmeters); Ammeters: ±1% (1-80A) / ±2% (0-1A) depending on CT rating |
|---|---|
| Voltage | L-N: 90~277 Vac 50/60Hz; L-L: 156~480 Vac 50/60Hz |
| Current | 80A~750A (CT dependent) |
| Frequency | 50/60Hz |
| Power Supply | <2W |
| Protocol | WiFi 802.11 b/g/n @ 2.4GHz + BLE (pairing); MQTT & HTTP API |
| MQTT | MQTT API — direct-to-cloud integration |
| HTTP | HTTP API — direct-to-cloud integration |
| Dimensions | 86(W) x 37(D) x 86(H) mm |
| Mounting | Wall mounting (default); DIN rail mounting (optional) |
| Operating Temp | -20℃ to +55℃ (≤90% non-condensing) |
| Measured Parameters | Voltage, Current, Power Factor, Frequency, Active Power |
| Reporting Cycle | 10s (default, configurable in integration) |
| Certification | CE |
| Place of Origin | China |
| Brand | OWON |
| Supported Systems | Single-Phase, Split-Phase, Three-Phase (included 3-Phase 3-Wire) |
| Clamp Inner Dimension | 80A (default): Ø10mm; 120A: Ø16mm; 200A: Ø20mm; 300A: Ø24mm; 500A: Ø36mm; 750A: Ø51mm |
| Ammeter Accuracy | 80A 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) |
| Wi-Fi | 802.11 b/g/n @ 2.4GHz |
| BLE | For Pairing |
Key Benefits
MQTT + HTTP API
Reports real-time data straight to your own cloud server via MQTT or HTTP API — no third-party public cloud required.
3P3W & Split-Phase Compatible
Supports three-phase 4-wire, 3-phase 3-wire, split-phase and single-phase systems with three CT clamps.
Bidirectional Measurement
Tracks both energy consumed and produced — ideal for solar PV self-consumption monitoring.
External Magnetic Antenna
Avoids signal shielding inside metal distribution boxes for reliable wireless reporting.
Ideal For
Common deployment scenarios where PC321-W/3W Single/Three-Phase WiFi MQTT Smart Energy Clamp delivers the most value.
Direct Cloud Integration
Feed real-time energy data into your own cloud server or MQTT broker without any third-party public cloud.
Solar PV Self-Consumption
Bi-directional measurement tracks solar generation, grid import/export and home consumption in real time.
Three-Phase 3-Wire Installations
3P3W wiring support covers regions and industrial panels using three-phase three-wire systems.
Whole-Home Energy Monitoring
Three CT clamps monitor total household consumption across single, split or three-phase supplies.
Residential & Commercial Submetering
Non-invasive CT clamps from 80A to 750A, wall or DIN-rail mounting — no rewiring required.
System Integrators & Platform Builders
MQTT API makes it straightforward to onboard the meter into custom EMS/BMS or energy analytics platforms.
Frequently Asked Questions
How does the PC321-W/3W connect to my own cloud server?
Which electrical systems does the PC321-W/3W support?
What CT clamp ranges are available?
Does it support bidirectional measurement?
What is the reporting cycle?
Related Products
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