1. Introduction
This manual provides essential information for the safe and effective use of your SMTONOFF 3 Phase 4 Wire 380V 100A Tuya WiFi Smart Bi-Directional Energy Power kWh Meter. This all-in-one smart IoT device is designed for AC 230V/400V, 50/60Hz, rated current up to 100A single or three-phase circuits in residential, commercial, and industrial buildings. It integrates electricity measurement, remote control, and comprehensive protection features, all manageable via a mobile app or voice commands.
2. Safety Information and Important Notes
- This device is designed for three-phase electricity systems only. Do not use it in single-phase electricity for long-term operation.
- The device features phase loss protection. Ensure all phases (N, L1, L2, L3) are correctly connected for proper functionality.
- For single-phase testing purposes only, connect N+L1+L2+L3. This configuration is not for continuous use. Refer to the 'Test Wiring' section for details.
- The prepaid function is off by default. If enabled, you must recharge the device, otherwise, it will not turn on. The default password for prepaid settings is 1234.
- If the prepaid function is enabled and the device fails to turn on due to insufficient balance, you can either turn off the prepaid switch in the 'Expense' section of the Tuya Smart app or charge energy within the same app section.
- If the protector trips 3 times due to leakage, it will not auto-reclose until the fault is manually fixed to ensure safety.
3. Product Overview
The SMTONOFF Smart Bi-Directional Energy Power kWh Meter is an advanced IoT device that combines multiple electrical functions into one compact unit. It allows for precise measurement of electricity consumption, offers remote control capabilities, and provides robust protection against various electrical anomalies. Its bi-directional metering feature makes it suitable for systems with renewable energy sources like solar PV.
Figure 1: SMTONOFF Smart Energy Meter with WiFi and App Control
4. Specifications
| Feature | Specification |
|---|---|
| Poles | Three Phase 4P (Single phase 2P also available for other models) |
| Rated Voltage | AC 3x230V/400V (Over/Under voltage protection adjustable) |
| Rated Current | 1~100A adjustable |
| Max Operating Current | 80A - 99A |
| Frequency | 50/60Hz |
| Output Voltage | 380V |
| Capacity | Resistive load ≤13kW, Inductive load ≤6kW |
| Self-consumption | <2W |
| Mounting | 35mm DIN-rail |
| Accuracy Class | 1% |
| Measuring Energy Range | 0-999999.99 kWh |
| Power Supply | AC |
| Display Type | Digital Only (Colourful LED) |
| DIY Supplies | Electrical |
| Certification | FCC, RoHS, KC, WEEE |
| Connectivity | 2.4G WiFi |
Figure 2: Product Dimensions (Height: 127mm, Width: 90mm, Depth: 67mm, Top Depth: 50mm)
5. Functional Features
- Four Control Options:
- Remote control via mobile app (Tuya Smart, Smart Life) anytime, anywhere.
- Voice control through AI speakers (Amazon Alexa, Google Assistant, Yandex Alice).
- Timing control with programmable schedules.
- Local manual control using physical keys and handle on the device.
- Real-time Monitoring: Monitor electricity consumption and statistics (Current A, Voltage V, Leakage Current mA, Active Power kW, Energy kWh, Temperature ℃) directly on your phone.
- Bi-directional Metering: Measures both positive active energy from the grid and negative active energy from solar PV systems.
- Prepaid Metering Mode: Available as an optional feature, configurable via the app.
- Adjustable Protections: Configure thresholds for various protections:
- Overcurrent protection: 1~100A (default 63A).
- Over voltage protection: 235~320V (default 275V).
- Under voltage protection: 90-210V (default 110V).
- Residual current (leakage) protection: 10~100mA (default 50mA).
- Alarm temperature protection: 50~90℃ (default 60℃).
- Tripping temperature protection: 60~100℃ (default 70℃).
- Auto-Reclosing: Automatically recovers after protected conditions return to normal, enabling non-attended management.
- Recovery On-Delay Time: Adjustable from 5~90 seconds (default 30s), set manually on the device.
- Ground Wiring: 2P models include ground wiring for surge protection; 4P models handle three-phase unbalance.
- Device Sharing: Share control of the device with family members or team members through the app.
Figure 3: Functional Features Overview
6. Setup and Installation
6.1 Wiring Diagram
Proper wiring is crucial for the safe and correct operation of the device. This device is designed for a 3-phase, 4-wire system. Always ensure all phases are connected due to phase loss protection.
Figure 4: Application 1 - Wiring in a standard 3-phase 4-wire AC system (Grid to Load)
Figure 5: Application 2 - Wiring in an AC + PV (Solar) bi-directional metering system
6.2 Single-Phase Test Wiring
If you need to test the device in a single-phase system, follow the diagram below. Note: This configuration is for testing only and not for long-term operation.
Figure 6: Test Wiring in a Single Phase System. All input terminals N, L1, L2, L3 must be connected as shown. If one of the terminals is not connected, the device will not work, and WiFi pairing may fail due to open-phase protection.
6.3 App Installation and Device Pairing
- Download and Install App: Download the 'Tuya Smart' or 'Smart Life' app from your mobile app store (available for iOS and Android). Register an account if you don't have one.
- Power On and Enter Pairing Mode: Power on the protector. After a short delay countdown, the signal indicator will flash rapidly to indicate it's in pairing mode. If it doesn't enter pairing mode automatically, long-press the 'down' key for a few seconds until the WiFi signal indicator flashes rapidly.
- Add Device in App:
Figure 7: Tuya Smart App - Adding the Breaker Device
- Open the Tuya Smart app.
- Tap the '+' icon to add a device.
- The app should detect the 'Breaker' device. Tap 'Add'.
- Enter your 2.4G WiFi network name and password, then tap 'Next'.
- Wait for the device to connect. Once added successfully, tap 'Done'.
Figure 8: Device Added Successfully and Main Control Screen
7. Operating Instructions
7.1 Remote Control (Mobile App)
Control your devices anytime, anywhere using the Tuya Smart or Smart Life mobile application. You can turn the breaker ON/OFF, monitor real-time data, and adjust settings remotely.
Figure 9: Remote Control via Mobile App
7.2 Voice Control
Integrate your device with popular AI speakers like Amazon Alexa, Google Assistant, or Yandex Alice for convenient voice commands.
Figure 10: Voice Control with AI Speakers
7.3 Timing Control (Scheduling)
Set programmable schedules to automate the ON/OFF state of the device, optimizing energy usage and making your life more efficient.
Figure 11: Timing Control / Scheduling
7.4 Manual Control
The device can also be controlled manually using the physical ON/OFF button on the unit itself, even without WiFi connectivity.
Figure 12: Manual Control
7.5 Prepaid Function
The prepaid metering mode allows you to manage energy consumption based on a pre-charged balance. This function is off by default.
- To enable/disable, navigate to the 'Expense' section in the Tuya Smart app and toggle the 'Switch prepayment' option.
- If enabled, you must charge energy. The rechargeable range is 0-9999.99 kWh.
- If the balance is low, the breaker will automatically cut off power.
- You can reset the energy balance to zero if needed.
- Accessing prepaid settings requires a password (default: 1234).
Figure 13: Prepaid Function App Interface
7.6 Adjustable Protections
You can customize the protection thresholds for overcurrent, overvoltage, undervoltage, leakage current, and temperature alarms via the app's settings.
Figure 14: Adjustable Protection Settings in App
7.7 Monitoring Consumption
The app provides detailed statistics on your electricity consumption, including hourly, daily, monthly, and yearly data. It also displays real-time current, power, voltage, and temperature.
Figure 15: Visible Consumption Data in App
7.8 Device Sharing
Share control of your smart energy meter with other users, allowing multiple individuals to manage and monitor the device.
Figure 16: Device Sharing
7.9 Video Demonstration
Video 1: Demonstration of App Setup and Control
8. Maintenance
The SMTONOFF Smart Energy Meter is designed for minimal maintenance. Ensure the device is installed in a dry, well-ventilated area, free from excessive dust or moisture. Periodically check wiring connections for tightness and signs of wear. For cleaning, use a soft, dry cloth. Do not use abrasive cleaners or solvents. If any issues arise, refer to the troubleshooting section or consult a qualified electrician.
9. Troubleshooting
- Device not powering on or WiFi pairing fails: Ensure all N, L1, L2, L3 input terminals are correctly connected. This device has phase loss protection, and incomplete connections will prevent operation. If the prepaid function is enabled, ensure sufficient energy balance.
- Device trips frequently due to leakage: If the protector trips 3 times due to leakage, it will not auto-reclose. You must identify and fix the underlying electrical fault causing the leakage before manually resetting the device.
- Prepaid function issues: If the device is not turning on due to the prepaid function, either disable the prepaid switch in the 'Expense' section of the Tuya Smart app or charge energy within the app. Remember the default password is 1234.
- Inaccurate readings: Verify that the wiring is correct and secure. Ensure the device is operating within its specified voltage and current ranges.
- No data in app: Check your WiFi connection and ensure the device is successfully paired with the Tuya Smart app.
10. User Tips
- For single-phase testing: While the device is primarily for three-phase, you can test it in a single-phase setup by connecting N+L1+L2+L3. Remember this is for testing only, not permanent use.
- Bi-directional energy monitoring: This meter is capable of measuring both energy consumed from the grid (positive active energy) and energy generated back to the grid (negative active energy), making it ideal for solar PV installations. The app provides detailed statistics for both.
- Hourly consumption data: The Tuya Smart app provides detailed electricity statistics, including hourly consumption, which can be useful for understanding energy usage patterns and optimizing tariffs.
- Security: Change the default password (1234) for the prepaid function and other sensitive settings in the app to enhance security.
11. Warranty and Support
For detailed warranty information and technical support, please refer to the official product documentation or contact SMTONOFF customer service. A comprehensive user manual in PDF format can be downloaded from the manufacturer's website: https://manuals.plus/m/6ba847662d78ca7133e3af147c7ce3ecb27dbba4cab65a87bd2f3cf9e7929b0e
