DEWIN Automatic Dual Power Transfer Switch

1. Introduction

This manual provides essential information for the safe and efficient installation, operation, and maintenance of your DEWIN Automatic Dual Power Transfer Switch. This device is designed to automatically switch between two power sources, typically a photovoltaic (PV) system or generator and the city power grid, ensuring a continuous power supply for compatible installations.

2. Safety Information

Please read and understand all safety instructions before installing or operating this device. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Installation and maintenance should only be performed by qualified electricians.
• Ensure all power sources are disconnected before performing any wiring or maintenance.
• Do not operate the switch if it is damaged or appears to be malfunctioning.
• This device is designed for specific voltage and current ratings. Do not exceed these limits.
• The product is made from high-quality flame-retardant materials, but proper ventilation and installation are still crucial.

3. Product Features

• High-Quality Construction: Manufactured from flame-retardant materials, offering good insulation, high-temperature resistance, and anti-aging properties for enhanced safety and reliability.
• Automatic Transfer: Designed for seamless automatic switching between primary (e.g., PV/Inverter) and secondary (e.g., City Power) sources.
• Fast Switching: Features a rapid response time of less than 0.05 seconds, ensuring minimal interruption to electrical appliances during power transitions.
• DIN Rail Mounting: Compatible with standard 35mm DIN rails for easy integration into existing electrical panels.
• Versatile Application: Suitable for various scenarios requiring dual power source management, including residential, commercial, and industrial settings.

4. Specifications

5. Installation

The DEWIN Automatic Dual Power Transfer Switch is designed for 35mm DIN rail mounting. Ensure the installation location is dry, well-ventilated, and within the specified temperature range.

5.1 Mounting

1. Verify that the junction box or electrical panel has sufficient space for the switch (dimensions: 78mm height, 105.5mm width).
2. Clip the switch onto a standard 35mm DIN rail securely.

5.2 Wiring

Refer to the wiring diagram below for correct connections. All wiring must comply with local electrical codes and standards.

• Common Power Supply (Source A): Connect your primary power source (e.g., PV system/inverter output) to the terminals labeled 'Source A'.
• Backup Power Supply (Source B): Connect your secondary power source (e.g., City Power) to the terminals labeled 'Source B'.
• Load Output: Connect your electrical load to the 'Load output' terminals.
• Control Lines: Connect the common control lines (L and N) and spare control line as indicated in the diagram.

Ensure all connections are tight and secure. Double-check all wiring before restoring power.

6. Operating Instructions

The DEWIN Automatic Dual Power Transfer Switch offers both manual and automatic operation modes.

6.1 Mode Selection

• Automatic Mode (Auto): Set the selector switch to 'Auto'. In this mode, the switch will automatically detect the availability of power sources and transfer the load to the active source. It prioritizes Source A (PV/Inverter) if available, otherwise switches to Source B (City Power).
• Manual Mode (Manual): Set the selector switch to 'Manual'. In this mode, the user must manually select the desired power source. This is typically used for testing or specific maintenance scenarios.

6.2 Power Transfer

• When operating in 'Auto' mode, the switch continuously monitors both power sources.
• Upon detection of a power failure in the primary source, the switch will automatically transfer the load to the secondary source within 0.05 seconds, provided the secondary source is active.
• When the primary power source is restored, the switch will automatically transfer the load back to the primary source.

Note: Automatic switching only occurs when the backup power source is active. If the backup power (e.g., generator) is not running or its fuse protection is not active, manual intervention may be required to activate it before the switch can transfer.

7. Maintenance

Regular maintenance ensures the longevity and reliable operation of your transfer switch.

• Periodic Inspection: Annually inspect the switch for any signs of physical damage, loose connections, or overheating.
• Cleaning: Keep the switch clean and free from dust and debris. Use a dry, non-abrasive cloth for cleaning. Do not use liquids or solvents.
• Terminal Check: Periodically check all terminal connections to ensure they remain tight. Loose connections can cause overheating and malfunction.
• Professional Service: For any complex issues or internal repairs, contact a qualified electrician or the manufacturer's support.

8. Troubleshooting

If you encounter issues with your transfer switch, refer to the following common troubleshooting steps:

9. Warranty and Support

For warranty information or technical support, please refer to the documentation provided at the time of purchase or contact your vendor. Keep your purchase receipt as proof of purchase.