1. Introduction
The EARU Dual Power Manual Transfer Switch (MTS) is a versatile electrical device designed for switching between two power sources or loads. It offers four primary functions: ON, OFF, Conversion, and Isolation. This manual provides detailed instructions for the safe and effective installation, operation, and maintenance of your EARU MTS circuit breaker.
This product is ideal for industrial equipment and circuits where reliable switching and isolation are critical. It is designed for installation on a standard 35mm DIN rail.
2. Product Features
- Dual Power Capability: Seamlessly switch between main and standby power supplies.
- Manual Operation: Operator-controlled switching for precise power management.
- High Performance: Features millisecond switching, quick switch functionality, and interlocking conversion.
- Durable Construction: Made from high flame-retardant PA66 injection molding and thermoset housing, ensuring resistance to high temperatures.
- Ergonomic Design: Large D-shaped handle with comfortable buttons for easier and more comfortable operation.
- Easy Installation: Designed for 35mm DIN rail mounting with securing clips.
- Reliable Wiring: Tunnel-type terminal blocks ensure tight and reliable wire connections.
- Safety Certified: CE certified, meeting European safety standards.
3. Setup and Installation
Safety First: Before beginning any installation, ensure that all power to the circuit is disconnected at the main breaker. Always consult with a qualified electrician if you are unsure about any steps.
- Mounting: The EARU MTS is designed for 35mm DIN rail installation. Securely attach the switch to the DIN rail within your household lighting distribution box or industrial control panel.
- Wiring: The switch typically features two power input terminals (main and standby) and one output terminal. Connect your main power supply to the designated input terminals (e.g., 'I' position), and your standby power supply to the other input terminals (e.g., 'II' position). Connect the load to the output terminals.
- Terminal Connections: Use appropriate cable sizes (up to 16mm²) and ensure all connections are tight within the tunnel-type terminal blocks for reliable operation.
Wiring Diagrams:
Refer to the following diagrams for correct wiring based on the number of poles:
4. Operating Instructions
The EARU Manual Transfer Switch allows you to manually select the desired power source for your load. The handle has three distinct positions:
- Position I (Common Power): Connects the load to the main power supply.
- Middle Position (Disconnect/OFF): Disconnects the load from both power supplies. All circuits are open.
- Position II (Standby Power): Connects the load to the standby power supply.
To switch between power sources, simply manipulate the handle to the desired position. Ensure a firm and complete movement of the handle to engage the selected power supply or to fully disconnect.
5. Maintenance
- Regular Inspection: Periodically check the switch for any signs of physical damage, loose connections, or overheating.
- Cleaning: Keep the switch free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquids or abrasive cleaners.
- Terminal Tightness: Ensure all terminal screws remain tight to prevent arcing and ensure proper electrical contact.
- Material Durability: The thermoset housing is designed for high temperatures, but avoid exposing the device to extreme heat sources beyond its specified ambient temperature range.
6. Troubleshooting
- No Power to Load:
- Check if the switch handle is fully engaged in either Position I or Position II.
- Verify that both the main and standby power sources are active.
- Inspect wiring connections for looseness or damage.
- Switch Feels Stiff:
- Ensure no foreign objects are obstructing the handle mechanism.
- The mechanism is designed for manual operation; apply firm, steady pressure.
7. Specifications
| Attribute | Value |
|---|---|
| Model Numbers | EA119G, EA219G, EA319G, EA419G |
| Type | Mini Circuit Breaker / Dual Power Manual Transfer Switch |
| Number of Poles | 1P, 2P, 3P, 4P |
| Rated Voltage | 1P: AC230V; 2P/3P/4P: AC400V |
| Rated Current | 40A / 63A |
| Rated Frequency | 50/60Hz |
| Electrical Life | 1500 cycles |
| Mechanical Life | 8500 cycles |
| Ambient Temperature | -5℃ ~ 40℃ |
| Protection Degree | IP20 |
| Terminal/Cable Size | 16mm² |
| Standard | IEC/EN 60947-3 |
| Certification | CE |
| Is Smart Device | No |
8. User Tips
- Overload Protection: While this device functions as a circuit breaker, it is primarily designed for switching and isolation. For comprehensive overload and short-circuit protection, ensure it is installed in conjunction with appropriate upstream protective devices (e.g., MCBs or RCDs) in your electrical system.
- CE Certification: This product is CE certified, confirming its compliance with European safety, health, and environmental protection requirements.
9. Warranty and Support
For any questions, technical assistance, or warranty claims, please contact the EARU Official Store customer support. Keep your purchase records for reference.
