Miniature Circuit Breaker

Material and Performance

• High-quality Insulation: The Miniature Circuit Breaker is constructed using non-flammable insulating materials that provide excellent electrical insulation. This ensures maximum safety by preventing electrical hazards such as arcs or sparks during operation, even in high-stress conditions.

• Corrosion Resistance: Designed with corrosion-resistant materials like specially treated plastics and silver-plated contacts, this MCB operates reliably in humid, saline, or corrosive environments. It is ideal for both industrial settings with high moisture levels and coastal areas with salt-laden air, ensuring that the breaker performs optimally even in the harshest conditions.

• Long Lifespan: Built for longevity, the Miniature Circuit Breaker is tested for over 10,000 mechanical operations, making it highly durable and suitable for high-frequency switching applications. The silver-plated contacts, with a resistance of ≤5mΩ, ensure long-lasting performance, maintaining low contact resistance and minimizing the risk of wear or failure over time.

• Thermal Stability: The circuit breaker is designed to withstand a wide operating temperature range from -5℃ to +40℃, ensuring stable performance in both extremely cold and hot environments. This makes it suitable for various climate conditions, from outdoor installations to indoor environments with temperature fluctuations.

• Low Contact Resistance: Silver-plated contacts with a low resistance of ≤5mΩ ensure optimal current flow, reducing energy loss and preventing heating that could lead to equipment damage or malfunction. This feature guarantees efficient energy transmission and helps to reduce operational costs.

• Impact and Vibration Resistance: The robust casing is engineered to be resistant to physical impacts and vibrations, making it highly durable for industrial environments or applications where equipment might be exposed to external shocks.

Applications

1. Residential Protection

• Protects lighting and socket circuits in homes, including appliances like AC units and refrigerators, from potential overloads and short circuits.

• Fire Prevention: Safeguards against overload fires by automatically disconnecting power when an overload is detected, preventing damage to household wiring and electrical devices.

2. Commercial Applications

• Ensures protection for office and store circuits, offering reliability for critical mixed loads such as computers, lights, and other commercial equipment.

• C-Curve Protection: The C-curve tripping characteristics are ideal for mixed load circuits, ensuring smooth operation and protection against overloads and short circuits in commercial spaces.

3. Industrial Equipment

• Secures small motors (≤3kW), which are commonly found in industrial machinery, from potential damage caused by overloads or short circuits.

• D-Curve Tolerance: The D-curve ensures tolerance for 6-10xIn startup surges, making it the perfect solution for motors with high inrush currents, such as pumps or conveyors, which are typically present in industrial settings.

4. Smart Homes

• Enhances voltage anomaly protection by integrating U2+O2 over/under-voltage modules, ensuring stable voltage supply for sensitive electronics in smart homes.

• Seamless Integration: Ideal for smart home automation systems, ensuring that electronic devices and appliances are protected from voltage fluctuations, preventing damage to connected systems like lighting control, security systems, and more.

FAQ

Q1: How to choose B/C/D tripping curves?  

A: B-curve (3-5×In) for lighting, C-curve (5-10×In) for sockets, D-curve (10-20×In) for motors.  

Q2: Is horizontal mounting allowed?  

A: Vertical installation only (≤5° tilt) to ensure arc quenching and tripping accuracy.  

Q3: When to replace an MCB?  

A: Replace if manual operation jams, contacts carbonize, or tripping time deviates >20%.  

Q4: Compatible with DC systems?  

A: AC-only. Use DC-rated models (3kA@250V breaking capacity).  

Q5: High-altitude usage?  

A: Derate by 5% per 1,000m above 2,000m or select "H"-suffix highland variants.