1. Important Safety Instructions
For optimal performance and safety, please read this manual thoroughly before using the circuit breaker and keep it for future reference.
WARNING
This product does not feature an explosion-proof structure and must not be used in flammable environments, such as those containing flammable gases, liquids, or explosives.
SAFETY INFORMATION
- Please use this product in accordance with the instructions in this manual.
- Do not disassemble this product by yourself.
- Pay attention to the rated voltage for use.
2. Product Overview
The EARU EAM1-A/B series DC Molded Case Circuit Breaker (MCCB) is designed to provide overload and short-circuit protection in direct current (DC) power systems. These circuit breakers are suitable for various applications, particularly in solar photovoltaic (PV) systems, wind power generation, hydropower, electric vehicles, lithium battery systems, UPS, mining factories, and other low-voltage DC power generation, transmission, and distribution scenarios.
The product is certified with CE, ensuring compliance with European safety standards.
Figure 1: Overview of EARU DC MCCB Circuit Breaker models.
Figure 2: Examples of product applications including solar, electric vehicles, and UPS systems.
3. Specifications
The EAM1-A/B series DC MCCBs are available in various configurations to meet different system requirements.
| Parameter | Value |
|---|---|
| Model Number | EAM1-125PV (Series EAM1-A/B) |
| Type | Molded Case Circuit Breaker (MCCB) |
| Poles Number | 1P, 2P |
| Rated Current (In) | 100A, 125A, 160A, 200A, 250A |
| Rated Voltage (Ue) | 1P: DC300V, 2P: DC600V |
| Rated Insulation Voltage (Ui) | DC600V (1P), DC800V (2P) |
| Rated Impulse Withstand Voltage (Uimp) | 12kV |
| Rated Ultimate Short-Circuit Breaking Capacity (Icu) | 50kA |
| Rated Service Short-Circuit Breaking Capacity (Ics) | 35kA |
| Tripping Time | ≤0.1S |
| Tripping Curve | B/C/D (C Curve by Default) |
| Mechanical Life | ≥80000 Cycles |
| Electrical Life | ≥20000 Cycles |
| Working Temperature | -40°C to +85°C |
| Standard | IEC60898-1 / IEC60947-2 |
| Certification | CE |
| Origin | Mainland China |
Dimensions
Figure 3: Dimensions and parameters for 1P DC MCCB (100A/125A).
Figure 4: Dimensions and parameters for 2P DC MCCB (100A/125A, 160A/200A/250A).
4. Installation and Setup
Installation should only be performed by qualified personnel in accordance with local electrical codes and standards.
4.1 Physical Installation
The circuit breaker is designed for secure mounting within an electrical enclosure. Ensure adequate space for ventilation and access to terminals.
Video 1: Demonstration of DC MCCB physical features, terminal connections, and size comparison between models.
4.2 Wiring Connections
Connect the DC power lines to the designated input (L+ IN) and output (L- OUT) terminals. Ensure all connections are tight and secure to prevent loose contacts and overheating.
- The housing is made of flame-retardant material.
- Use a closed wrench for terminal connections.
Figure 5: Terminal markings (L+ IN, L- OUT) and test button location.
4.3 Typical Wiring Diagram
Below is a typical wiring diagram for connecting the DC MCCB in a battery inverter charging system for solar applications.
Figure 6: Wiring diagram showing DC MCCB as an isolating switch between solar panels, batteries, and inverter.
5. Operating Instructions
The DC MCCB functions as an overload and short-circuit protection device. It has a simple ON/OFF operation.
5.1 Switching On/Off
- To switch the circuit breaker ON, push the red lever to the 'ON' position.
- To switch the circuit breaker OFF, push the red lever to the 'OFF' position.
5.2 Test Button
A test button is provided to verify the tripping mechanism. Press the test button when the power is ON. If the breaker trips, it indicates normal operation of the tripping mechanism.
Figure 7: Location of the test button (red dot) on the circuit breaker.
6. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of your DC MCCB.
- Visual Inspection: Periodically inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the circuit breaker clean and free from dust and debris. Use a dry, non-abrasive cloth for cleaning.
- Terminal Check: Ensure all terminal connections remain tight. Loose connections can lead to overheating and potential failure.
- Function Test: Perform the test button operation periodically to ensure the tripping mechanism is functional.
Do not attempt to repair or modify the circuit breaker yourself. Contact a qualified electrician for any issues beyond routine inspection and cleaning.
7. Troubleshooting
If the circuit breaker trips frequently or fails to operate correctly, consider the following troubleshooting steps:
- Frequent Tripping: This often indicates an overload or a short circuit in the protected DC system.
- Check the connected load to ensure it does not exceed the circuit breaker's rated current.
- Inspect the wiring for any signs of short circuits (e.g., damaged insulation, exposed wires touching).
- If the issue persists, consult a qualified electrician to diagnose the electrical system.
- Failure to Trip: If a fault occurs and the breaker does not trip, it may be faulty.
- Immediately disconnect power to the affected circuit.
- Do not attempt to force the breaker ON.
- Replace the faulty circuit breaker with a new one of the correct rating.
- Overheating: If the circuit breaker feels excessively hot to the touch, it could indicate an overload or loose connections.
- Reduce the load on the circuit.
- Check and tighten all terminal connections.
8. User Tips
- Accessory Compatibility: This DC MCCB model does not typically include tripping coils or shunt coils as standard accessories. If such functionality is required, ensure to select a model specifically designed for these accessories or consult with the manufacturer for compatible options.
- Proper Sizing: Always ensure the circuit breaker's rated current and voltage match the requirements of your DC system to provide effective protection.
9. Warranty and Support
For detailed warranty information and technical support, please refer to the official product documentation or contact EARU customer service.
A user manual in PDF format is available for download: User manual (PDF)
