EIMSOAH Automatic Transfer Switch NL03-125/2P User Manual

1. Introduction

This manual provides essential information for the safe and effective installation, operation, and maintenance of the EIMSOAH NL03-125/2P Automatic Transfer Switch (ATS). This device is designed for 50Hz or 60Hz AC rated 110V 100A emergency power supply systems, ensuring continuous power by automatically switching between normal and standby power sources.

2. Safety Information

WARNING: Electrical shock hazard. Installation and maintenance should only be performed by qualified personnel.

• Always disconnect power from both normal and standby sources before installation, inspection, or maintenance.
• Ensure all wiring connections are secure and comply with local electrical codes.
• Do not operate the switch if it appears damaged.
• The maximum surrounding temperature shall not exceed 40℃, the minimum shall not be lower than -5℃, and the average temperature within 24 hours shall not be higher than 35℃.
• The altitude of the installation site should not be higher than 2000m.
• When the maximum temperature reaches 40℃, the relative humidity of the installation site should not exceed 50%. At lower temperatures, higher humidity is permissible (e.g., 90% at 25℃). Special measures may be required to address occasional condensation.

3. Product Features

• Automatic and Manual Operation: The switch supports both automatic and manual switching modes.
• Fast Switching: Millisecond-level switching without interruption (Operation changeover time: ≤50ms).
• 35mm Rail Mounting: Designed for standard 35mm DIN rail installation, facilitating easy setup and maintenance.
• Durable Construction: Constructed from flame-retardant PC material with good insulation and high-temperature resistance. Features silver contacts for improved conductivity and anti-aging properties.
• Protection Functions: Includes short circuit protection, overload protection, phase failure protection, and undervoltage protection.
• Wide Application: Suitable for various settings requiring continuous power, such as homes, shopping malls, factories, laboratories, and farms.

Image 3.1: Overview of the EIMSOAH Automatic Transfer Switch, illustrating its auto/manual operation, 35mm rail mount compatibility, reliable transmission, and PC and silver material composition.

4. Specifications

5. Setup and Installation

Before installation, carefully inspect the ATS for any damage. Ensure the operating handle moves freely to confirm the flexibility of the drive mechanism. Test the generation and disconnection conditions for each stage of load for both normal and standby power sources.

5.1 Mounting

The ATS is designed for standard 35mm DIN rail mounting. Securely attach the switch to the DIN rail in your PZ30 distribution box or other suitable enclosure.

Image 5.1: Close-up view of the Automatic Transfer Switch, illustrating the fixed snap mechanism for guide rail installation, highlighting its secure and insulated design.

5.2 Wiring Connections

Connect the normal power source, standby power source, and load output according to the wiring diagram. Ensure all connections are tight and correct to prevent electrical hazards and ensure proper operation.

Image 5.2: Detailed wiring diagram for the Automatic Transfer Switch, showing connections for commonly used incoming lines, spare incoming line, load output, common control lines, and spare control line.

The switch features copper terminals for strong electrical conductivity and silver contacts for enhanced durability and performance.

Image 5.3: Detailed view of the Automatic Transfer Switch's internal components, highlighting the silver contacts and copper terminals, and illustrating the power transfer from grid/public power to solar/wind/battery.

6. Operating Instructions

The Automatic Transfer Switch is designed to provide continuous power by automatically switching between a normal power supply and a backup power supply.

6.1 Automatic Mode

In automatic mode, the switch continuously monitors the normal power supply. If the normal power supply becomes abnormal (e.g., power outage), the switch will automatically transfer the load to the standby power supply within milliseconds. Once the normal power supply is restored, the switch will automatically revert the load back to the normal power supply.

Image 6.1: Diagram illustrating the automatic power transfer process: upon power outage, the system transfers to backup power, and upon incoming power, it transfers back to main power with millisecond switching.

6.2 Manual Mode

The switch can also be operated manually using the operating handle. This allows for manual selection of the power source when required, overriding the automatic function. Ensure the power is disconnected before manually switching if safety protocols require it.

7. Maintenance

Regular inspection of the Automatic Transfer Switch is recommended to ensure optimal performance and safety.

• Periodically check all wiring connections for tightness and signs of corrosion.
• Inspect the switch for any physical damage or signs of overheating.
• Ensure the operating handle moves freely and without obstruction.
• Keep the switch clean and free from dust and debris.

8. Troubleshooting

If the Automatic Transfer Switch is not functioning as expected, consider the following:

• No Power Transfer: Verify that both normal and standby power sources are active and correctly connected. Check for tripped circuit breakers or blown fuses.
• Intermittent Operation: Inspect all wiring for loose connections. Ensure the environmental conditions (temperature, humidity) are within the specified limits.
• Switch Not Engaging: Check the manual operating handle for any obstructions. If in automatic mode, ensure control signals are correctly received.

If issues persist after basic troubleshooting, contact a qualified electrician or the manufacturer for assistance.

9. Warranty and Support

For warranty information or technical support, please refer to the product packaging or contact EIMSOAH customer service through their official channels. Keep your purchase receipt for warranty claims.