DEWIN 4P 63A 400V Automatic Dual Power Transfer Switch Instruction Manual

1. Introduction

Thank you for choosing the DEWIN Automatic Dual Power Transfer Switch. This device is designed to automatically switch between two power sources, such as city power and a generator, ensuring an uninterrupted power supply for critical loads. It features a compact structure, reliable transmission, and convenient installation and maintenance. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your transfer switch.

Important Note: This product is suitable only for grid/generator operation and cannot be used with inverters, UPS systems, photovoltaic systems, or solar power generation.

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, serious injury, or death.

• Qualified Personnel Only: Installation and maintenance must be performed by qualified electricians in accordance with all local and national electrical codes.
• Disconnect Power: Always disconnect all power sources before working on the transfer switch or connected circuits. Verify that power is off using a voltage tester.
• Proper Grounding: Ensure the device is properly grounded to prevent electric shock.
• Environmental Conditions: Do not install in wet, dusty, or corrosive environments. Ensure adequate ventilation.
• Correct Wiring: Follow the wiring diagram precisely. Incorrect wiring can damage the device and connected equipment, and pose a safety hazard.
• Voltage and Current Ratings: Do not exceed the specified voltage and current ratings of the device.

3. Product Overview

The DEWIN Automatic Dual Power Transfer Switch (ATS) is designed for seamless power transfer between a primary (City Power) and a secondary (Generator) source. It ensures continuous power to your electrical loads by automatically switching to the available source.

Figure 3.1: Front view of the DEWIN Automatic Dual Power Transfer Switch, showing input terminals for City Power (Source A) and Generator (Source B), and output terminals for the load.

Figure 3.2: Close-up view of the terminal blocks on the DEWIN transfer switch, illustrating the robust connections for power input and output.

Key Features:

• Automatic switching between main power and backup power.
• Millisecond-level rapid switching (less than 0.05 seconds) to prevent power interruption.
• Compact design for DIN rail mounting.
• Manual override function for maintenance or emergency situations.
• Suitable for various applications including residential, commercial, and industrial settings.

4. Specifications

5. Installation

Installation of the DEWIN Automatic Dual Power Transfer Switch should only be performed by a qualified electrician. Ensure all power sources are disconnected before beginning installation.

5.1 Mounting

• Mount the transfer switch on a standard DIN rail within an appropriate electrical enclosure.
• Ensure sufficient space around the device for ventilation and wiring access.

Figure 5.1: The DEWIN transfer switch mounted within a typical household distribution box, demonstrating its compact fit and integration.

5.2 Wiring Diagram

Refer to the following wiring diagram for correct connection of the main power source (City Power), backup power source (Generator), and the load.

Figure 5.2: Detailed wiring diagram showing connections for common power (L1, L2, L3, N), backup power (L1, L2, L3, N), and the load. Control lines and neutral connections are also indicated.

• Source A (City Power): Connect the main power supply to the terminals labeled "Source A" (AL1, AL2, AL3, N).
• Source B (Generator): Connect the generator power supply to the terminals labeled "Source B" (BL1, BL2, BL3, N).
• Load Output: Connect the electrical loads to the output terminals of the switch.
• Control Wiring: Ensure control wiring (NC, NO, C, AR, AN, BR, BN) is connected as per the diagram for automatic operation.
• Grounding: Ensure all ground connections are secure.

After wiring, double-check all connections for tightness and correctness before restoring power.

6. Operation

The DEWIN Automatic Dual Power Transfer Switch operates in two modes: Automatic and Manual.

Figure 6.1: The transfer switch showing the selector switch for "Manual" and "Auto" operation modes.

6.1 Automatic Mode

• Set the selector switch to the "Auto" position.
• When the primary power source (City Power) is available, the switch will connect the load to Source A.
• If the primary power fails, the switch will automatically detect the outage and transfer the load to the secondary power source (Generator) within milliseconds (less than 0.05 seconds).
• When the primary power is restored, the switch will automatically transfer the load back to Source A.

Figure 6.2: The transfer switch demonstrating its rapid switching capability, ensuring minimal interruption to connected electrical appliances.

6.2 Manual Mode

• Set the selector switch to the "Manual" position.
• In manual mode, the power source must be selected manually by operating the switch lever.
• This mode is typically used for testing, maintenance, or in situations where automatic transfer is not desired.
• Caution: Ensure the load can handle the manual transfer without damage.

7. Maintenance

Regular maintenance ensures the longevity and reliable operation of your DEWIN Automatic Dual Power Transfer Switch. Always disconnect power before performing any maintenance.

• Visual Inspection: Periodically inspect the switch for any signs of damage, loose connections, discoloration, or overheating.
• Terminal Tightness: Check and tighten all terminal screws annually to ensure good electrical contact.
• Cleaning: Keep the device clean and free from dust and debris. Use a dry, non-abrasive cloth for cleaning. Do not use liquids or solvents.
• Functional Test: Periodically test the automatic transfer function by simulating a primary power outage (e.g., by turning off the main breaker, if safe to do so and permitted by local regulations).

8. Troubleshooting

If you encounter issues with your transfer switch, refer to the following troubleshooting guide. For problems not listed here, contact qualified service personnel.

9. Warranty and Support

For warranty information or technical support, please contact DEWIN customer service through your point of purchase or visit the official DEWIN website. Please have your model number (KALFLCZKC-4P63A400V) and purchase date available when contacting support.

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