1. Introduction
The KWS-306 series smart voltage meter is a versatile electricity monitoring tool designed for various applications. It accurately measures voltage, current, wattage, and electricity consumption (KWH). Featuring a high-definition color screen and optional Wi-Fi connectivity (Tuya integration), it offers remote control and detailed data statistics via a mobile application. This device is designed for easy installation on a standard 35mm DIN rail and includes multiple power-off protection functions to ensure safety and reliability.
2. Key Features
- High-Definition Color Screen Interface: Utilizes an ultra-large LCD color VA display for a clear and intuitive visual experience.
- Standard Rail Slot Installation: Designed for convenient 35mm DIN rail mounting, requiring no screws and featuring snap-on fixing.
- Comprehensive Power-Off Protection Functions: Includes 6 types of protection:
- Over-temperature protection
- Over/Under-voltage protection
- Over-current protection
- Over-power protection
- Voltage imbalance protection
- Current imbalance protection
- Mobile Phone Remote Control (Wi-Fi Models): Supports controlling multiple devices with one mobile phone and allows multiple phones to control a single device via the Tuya APP.
- All-Copper Magnetic Retention Relay: Ensures static zero power consumption, improving switching reliability and safety.
- Versatile Application: Suitable for rental houses, family homes, companies, hotels, high and low distribution cabinets, factory assembly lines, warehouses, and exhibition cabinet display racks.
3. Product Specifications
| Parameter | Value |
|---|---|
| Model | KWS-306 Series (KWS-306WF, KWS-306L, KWS-306) |
| Voltage Range | AC 85-290V |
| Current Range | 0-80A |
| Power Range | 0-23KW |
| Timing Range | 0-999 hours (WIFI version APP: 365 days) |
| Temperature Range | -20~150℃ |
| Frequency Range | 50-60HZ |
| Power Factor | 0.00-1.00PF |
| Accuracy Class | 0.001 |
| Display Type | Analog and Digital |
| Product Size | 86.5mm (H) x 74mm (W) x 65mm (D) |
| Display Size | 55mm x 34mm |
| Guide Rail Installation Size | 35mm |
| DIY Supplies | Electrical |
| Origin | Mainland China |
| Certification | None |
For a detailed comparison of models (KWS-306WF, KWS-306L, KWS-306) and their specific features like Wi-Fi, 485 Communication, and APP/PC side curve charts, please refer to the product parameter table below:
Product Parameter Table: KWS-306WF, KWS-306L, KWS-306 comparison.
4. Package Contents
Upon opening your package, please verify that all the following items are included:
- Multi-function meter (1 unit)
- Instruction manual (1 unit)
- NTC sensor line (1 unit)
Image: KWS-306WF meter with included NTC sensor line and user manual.
5. Installation
The KWS-306 series meter is designed for easy installation on a standard 35mm DIN rail. Follow these steps for proper mounting:
- Ensure the main power supply is turned off before beginning any installation.
- Locate a suitable 35mm DIN rail within your electrical panel or distribution cabinet.
- Align the meter's rail slot with the DIN rail.
- Snap the meter onto the rail. The design allows for convenient, screw-free fixing.
- Verify that the meter is securely attached to the rail and does not wobble.
Image: Standard rail slot mounting design for easy installation.
Image: Examples of KWS-306 meter installations in different settings.
6. Wiring Instructions
Proper wiring is crucial for the safe and accurate operation of the meter. Always ensure power is disconnected before wiring. Consult a qualified electrician if you are unsure about any steps.
6.1 Three-Phase Four-Wire Wiring Method
For three-phase four-wire systems, connect the A, B, C phase fire wires and the N zero wire to the upper input terminals. Connect the corresponding load wires to the output terminals below. The NTC hole is for connecting the temperature sensor (if applicable).
Image: Three-phase four-wire wiring diagram.
6.2 Single-Phase Wiring Method
For single-phase systems, connect the N zero wire and A phase fire wire to the upper input terminals. Connect the corresponding load wires to the output terminals below. Note that the RS485 interface (if present) is not active without the 485 function.
Image: Single-phase wiring diagram.
6.3 Single-Phase Multi-Method Wiring
This diagram illustrates a multi-method single-phase wiring, showing how multiple loads can be connected across different firewire terminals (A, B, C) and a common N zero wire.
Image: Single-phase multi-method wiring diagram.
7. Operation
7.1 Display Interface and Buttons
The KWS-306 features a high-definition color screen that displays various electrical parameters. The interface includes:
Image: Faceplate function introduction.
- Display Elements: Shows A, B, C three-phase voltage, current, active power, power factor, frequency, and sensor temperature.
- '-' Key (5): Allows you to view A, B, C phase power individually.
- '-' Button (6): Used to view Timing, Total Active Power, and Total Active Energy.
- Operation Buttons (9): Includes 'M' (Menu), '+' (Up/Increase), '-' (Down/Decrease), and 'ON/OFF' buttons for navigation and control.
- WIFI Labelling (10): Indicates Wi-Fi functionality (for Wi-Fi version development only).
7.2 Mobile APP Function (Wi-Fi Models)
For KWS-306WF models, the dedicated mobile application (Tuya integration) provides powerful statistical and control functions:
Image: Powerful APP functions for monitoring and control.
- Remote Control: Control the meter from your mobile phone, with unlimited distance.
- Statistical Functions: View individual statistics for each phase (day, month, year) for current, voltage, and power.
- Power Curves: Analyze power curves and total power/temperature curves.
- Timer Functionality: Set timers for operation.
- Multi-Device Control: Manage multiple KWS-306 devices from a single phone.
Watch this video for a visual overview of the product:
Video: Product overview and demonstration of features.
8. Protection Functions
The KWS-306 series meters are equipped with advanced power-off protection features to safeguard your electrical system and connected devices:
- Over-temperature Protection: Automatically disconnects power if the device's internal temperature exceeds a safe limit, preventing damage from overheating.
- Over/Under-voltage Protection: Shuts off power if the voltage goes above or below a pre-set safe range, protecting sensitive electronics from voltage fluctuations.
- Over-current Protection: Activates if the current draw exceeds the maximum allowable limit, preventing circuit overload and potential fire hazards.
- Over-power Protection: Disconnects power if the total power consumption surpasses a defined threshold, useful for managing load and preventing system strain.
- Voltage Imbalance Protection: Monitors and protects against significant voltage differences between phases in three-phase systems, which can harm motors and other inductive loads.
- Current Imbalance Protection: Detects and protects against excessive current differences between phases, indicating potential faults or unbalanced loads.
These protection values can often be customized, especially in stand-alone versions, to suit specific application requirements.
9. User Tips
- For Wi-Fi models, ensure a stable 2.4GHz Wi-Fi network for optimal remote monitoring and control.
- Regularly check the display for any error codes or unusual readings.
- Utilize the APP's statistical functions to track energy consumption patterns and identify areas for efficiency improvement.
- If using the NTC temperature sensor, ensure it is placed in a location representative of the temperature you wish to monitor.
10. Troubleshooting
If you encounter issues with your KWS-306 meter, consider the following common troubleshooting steps:
- No Display/Power: Check all wiring connections to ensure they are secure and correctly installed. Verify that the main power supply is active.
- Incorrect Readings: Double-check wiring against the diagrams provided. Ensure the meter is configured correctly for your electrical system (single-phase vs. three-phase).
- Wi-Fi Connectivity Issues (WF models): Ensure your Wi-Fi network is 2.4GHz and stable. Restart your router and the meter. Re-pair the device with the Tuya APP if necessary.
- Protection Function Tripping: Identify which protection function has been triggered (e.g., over-voltage, over-current). Address the underlying electrical issue (e.g., reduce load, check voltage stability) before resetting the meter.
- Buttons Unresponsive: Ensure the device is powered on. If the issue persists, a power cycle (turning off and on) might resolve it.
For persistent problems, refer to the detailed user manual PDF or contact customer support.
11. Maintenance
The KWS-306 meter requires minimal maintenance to ensure long-term performance:
- Cleaning: Use a soft, dry cloth to clean the display and exterior of the meter. Do not use abrasive cleaners or solvents.
- Environmental Conditions: Ensure the meter is operated within its specified temperature range (-20~150℃) and protected from excessive moisture or dust.
- Firmware Updates (WF models): Periodically check the Tuya APP for any available firmware updates to ensure optimal performance and access to new features.
- Connection Checks: Occasionally inspect wiring connections for any signs of loosening or corrosion, especially in high-vibration environments.
12. Warranty and Support
For detailed warranty information and customer support, please refer to the official documentation provided with your product. A comprehensive user manual in PDF format is available for download and can be accessed via the following link: User Manual (PDF).
Please retain your proof of purchase for any warranty claims.