1. Introduction
This user manual provides essential information for the safe and effective operation of the Automatic Power Supply Switching Controller Module. This module is designed to ensure uninterrupted power supply by automatically switching between a main power source and a backup power source.
It is ideal for applications requiring continuous power, such as incubators and network systems, where a brief power interruption during switching is acceptable.
2. Product Overview
The Automatic Power Supply Switching Controller Module (Model YX-Q01) is a compact and efficient device that manages power transitions. It features screw terminals for easy wire connection and includes an LED indicator to show the load status.

Figure 2.1: Top-down view of the Automatic Power Supply Switching Controller Module, showing the two blue relays, green screw terminals, and various electronic components on a blue circuit board.
Key components include:
- Main Power Input Terminals: For connecting the primary power source.
- Backup Power Input Terminals: For connecting the secondary/emergency power source.
- Output Terminals: For connecting the load device.
- Relays: Two blue relays responsible for switching between power sources.
- LED Indicator: Illuminates to indicate the status of the load connection.
- Potentiometer: For adjusting voltage values (turn on/off).
3. Features
- Automatic switching between main and backup AC power sources (85V~240V).
- Designed with screw terminals for convenient and secure wire connections.
- Output voltage is typically the same as the input voltage.
- LED indicator to show load connection status.
- Adjustable turn on/off voltage values via potentiometer.
- Compact design for easy integration and storage.
- Helps prevent battery over-discharging when used with backup batteries, prolonging battery life.
4. Setup and Wiring
Proper wiring is essential for the safe and correct operation of the module. Refer to the diagram below for connection points.

Figure 4.1: Connection Diagram for the Automatic Power Supply Switching Controller Module.
- Identify Terminals: Locate the "Main Power Supply" (主电源), "Backup Power Supply" (备用电源), and "Output" (输出) screw terminals on the module. The "N" and "L" markings indicate Neutral and Live connections respectively.
- Connect Main Power: Connect your primary AC power source (85V~240V) to the "Main Power Supply" terminals. Ensure correct polarity (Live to L, Neutral to N).
- Connect Backup Power: Connect your backup AC power source (85V~240V) to the "Backup Power Supply" terminals. Ensure correct polarity.
- Connect Load: Connect your device or load to the "Output" terminals. The output voltage will be the same as the active input voltage.
- Secure Connections: Ensure all wire connections are tight and secure within the screw terminals to prevent loose connections and potential hazards.
Warning: Always ensure power is disconnected from all sources before performing any wiring to prevent electric shock.
5. Operating Instructions
Once wired correctly, the module operates automatically:
- Automatic Switching: When the main power source is present, the module will connect the load to the main power. If the main power fails, it will automatically switch to the backup power source.
- Power Recovery: When the main power is restored, the module will automatically switch the load back to the main power source.
- Temporary Interruption: Note that during the switching process, there will be a temporary power failure for approximately less than 1 second. This is normal operation.
- LED Indicator: The integrated LED indicator will illuminate when the load is connected and receiving power.
- Voltage Adjustment: The module features potentiometers (if applicable to your specific model) that allow for adjustment of the turn-on and turn-off voltage values, particularly useful for battery-based backup systems to manage discharge levels.
6. Maintenance
The Automatic Power Supply Switching Controller Module is designed for low maintenance. Follow these general guidelines:
- Keep Dry: Ensure the module is installed in a dry environment, away from moisture and excessive humidity.
- Cleanliness: Periodically inspect the module for dust or debris accumulation. If necessary, gently clean with a soft, dry brush or compressed air. Do not use liquids.
- Connection Check: Occasionally check the screw terminals to ensure all wire connections remain tight and secure.
- Ventilation: Ensure adequate airflow around the module to prevent overheating, especially if operating under continuous load.
7. Troubleshooting
If you encounter issues with your module, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Module does not switch power sources. |
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| LED indicator is off. |
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| Frequent switching or unstable operation. |
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If the problem persists after attempting these solutions, please contact customer support.
8. Specifications
| Parameter | Value |
|---|---|
| Main Power Voltage | 85V~240V AC |
| Backup Power Voltage | 85V~240V AC |
| Load Current | 10A (Maximum) |
| Mounting Hole Diameter | 3mm / 0.1in |
| Dimensions (L x W x H) | Approx. 70mm x 47mm x 18mm (2.75in x 1.85in x 0.7in) |
| Weight | Approx. 44g |

Figure 8.1: Module Dimensions.
9. Warranty and Support
We value your shopping experience and strive to offer a high-quality product and service. While specific warranty details are not provided, we are committed to customer satisfaction.
If you encounter any trouble during use, require technical assistance, or have questions regarding the Automatic Power Supply Switching Controller Module, please contact our customer support team. We are here to help you.
Please refer to your purchase documentation or the seller's contact information for support channels.