How to Use DC Circuit breaker BLAGAIN 80A DC MPPT to Bat: Examples, Pinouts, and Specs

The BLAGAIN 80A DC Circuit Breaker is a robust and reliable protection device designed for DC circuits. It is specifically engineered to safeguard systems from overloads and short circuits, ensuring the safety and longevity of connected components. This circuit breaker is rated for 80A and is particularly well-suited for use in solar power systems, where it is commonly installed between a Maximum Power Point Tracking (MPPT) charge controller and a battery.

• Solar power systems for residential and commercial setups
• Protection of DC circuits in renewable energy systems
• Battery banks and energy storage systems
• Electric vehicle (EV) charging stations
• Off-grid power systems

The following table outlines the key technical details of the BLAGAIN 80A DC Circuit Breaker:

The BLAGAIN 80A DC Circuit Breaker does not have traditional pins but instead features screw terminals for secure connections. The terminal configuration is as follows:

1. Placement in the Circuit: Install the circuit breaker between the MPPT charge controller and the battery. Ensure the "Line" terminal is connected to the MPPT output and the "Load" terminal is connected to the battery's positive terminal.
2. Mounting: Secure the circuit breaker on a DIN rail or a flat surface using screws. Ensure it is mounted in a location with adequate ventilation.
3. Wiring: Use appropriately rated wires (e.g., 6 AWG for 80A) to connect the terminals. Tighten the screws firmly to ensure a secure connection.
4. Operation: Flip the breaker switch to the "ON" position to allow current flow. In case of an overload or short circuit, the breaker will trip to the "OFF" position, cutting off the current.

• Wire Sizing: Always use wires rated for at least 80A to prevent overheating or damage.
• Polarity: Ensure correct polarity when connecting the circuit breaker to avoid damage to the system.
• Environmental Conditions: Avoid installing the breaker in areas exposed to moisture, extreme temperatures, or direct sunlight.
• Periodic Inspection: Regularly check the breaker for signs of wear, corrosion, or loose connections.

While the BLAGAIN 80A DC Circuit Breaker is not directly connected to an Arduino, it can be used in systems where an Arduino monitors the solar power system. For example, you can use a current sensor to monitor the current flowing through the breaker. Below is an example Arduino code snippet for monitoring current using an ACS712 sensor:

// Include necessary libraries
const int sensorPin = A0; // Connect ACS712 output to Arduino A0
float sensitivity = 0.066; // Sensitivity for 30A ACS712 (66mV/A)
float offsetVoltage = 2.5; // Offset voltage at 0A (for 5V supply)

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read sensor value
  float voltage = (sensorValue / 1023.0) * 5.0; // Convert to voltage
  float current = (voltage - offsetVoltage) / sensitivity; // Calculate current

  // Print current to Serial Monitor
  Serial.print("Current: ");
  Serial.print(current);
  Serial.println(" A");

  delay(1000); // Wait 1 second before next reading
}

Note: Replace the sensitivity value with the appropriate value for your ACS712 model (e.g., 0.185 for 5A, 0.100 for 20A).

1. Breaker Trips Frequently:

   • Cause: Overload or short circuit in the system.
   • Solution: Check the connected load and ensure it does not exceed 80A. Inspect the wiring for short circuits.

2. Breaker Does Not Reset:

   • Cause: Internal damage or persistent fault in the circuit.
   • Solution: Disconnect the breaker and inspect for damage. Verify the circuit for faults before resetting.

3. Loose Connections:

   • Cause: Improperly tightened screws on the terminals.
   • Solution: Re-tighten the screws and ensure secure connections.

4. Overheating:

   • Cause: Undersized wires or poor ventilation.
   • Solution: Use wires rated for 80A or higher and ensure proper airflow around the breaker.

Q1: Can this circuit breaker be used for AC circuits?
A1: No, the BLAGAIN 80A DC Circuit Breaker is designed specifically for DC circuits and is not suitable for AC applications.

Q2: What happens if the breaker trips?
A2: The breaker will cut off the current flow to protect the circuit. You can reset it by flipping the switch back to the "ON" position after resolving the issue.

Q3: Is this breaker waterproof?
A3: No, the breaker is not waterproof. It should be installed in a dry, protected environment.

Q4: Can I use this breaker with a 24V battery system?
A4: Yes, the breaker is compatible with 12V-48V DC systems, including 24V setups.

Q5: How do I know if the breaker is faulty?
A5: If the breaker does not reset or trips without any load, it may be faulty and should be replaced.