As a trusted MCB supplier in China, HAIPART produces high-quality miniature circuit breakers for global clients. Our products meet IEC standards and offer reliable overload and short-circuit protection. Learn about our certifications or contact us for custom MCB solutions.
Choose from our standard or customized MCBs, designed for safety and efficiency.
Specifications:
Current Rating: 125A | Voltage: 240V AC
Poles: 1P | Trip Type: Thermal-Magnetic
Enclosure Design: DIN-rail mounted | Dimensions: Standard 17.5mm module.
Applications:
Ideal for residential electrical panels, light commercial distribution boards, and branch circuit protection.
Advantages:
Durable, Cost-effective, easy installation, compact size, and durable galvanized contacts.
Specifications:
Current Rating: 125A | Voltage: 415V AC
Poles: 3P | Breaking Capacity: 10kA
Applications:
Protects industrial machinery, motor control circuits, and three-phase power systems.
Why HAIPART?
ISO 9001, CE, RoHS certified | Fast delivery from our factory in Wenzhou, China.
Distribution boards (1P 20A-32A).
Lighting circuits (Type B 6kA).
Kitchen appliance protection.
Motor control centers (3P 63A-125A).
Machine tool protection (10kA breaking capacity).
PLC control panels.
Marine electrical systems (IP55 enclosures).
Agricultural equipment (vibration-resistant).
Data centers (surge-protected variants).
✅ Expertise: Over 10 years in MCB design for DC/AC systems (up to 600V).
✅ Certifications: ISO 9001, IEC standards, RoHS certified. View all certificates.
✅ Custom Solutions: Specializing in:
DC miniature circuit breakers (20A-63A).
Mini circuit breaker panels for marine and agriculture.
Surge-protected MCBs with integrated RCCB.
✅ Global Service: Serving clients in Europe, Asia, and North America. Customer success stories.
A miniature circuit breaker (MCB) is an automated electrical switch designed to protect circuits from:
Overloads (exceeding 125A current rating)
Short circuits (6-10kA breaking capacity)
Fault currents (thermal-magnetic trip mechanism)
Unlike fuses, our IEC 60898 certified MCBs can be manually reset after tripping.
| Feature | MCB | MCCB |
|---|---|---|
| Current Range | ≤125A | 10-2,500A |
| Breaking Capacity | 6-10kA | 10-200kA |
| Typical Use | Residential/commercial | Industrial plants |
| Installation | DIN-rail mount | Panel/fixed mount |
Key distinctions:
⏱️ Response Time: MCBs trip in 2-20ms vs fuses' 0.1-2 seconds
♻️ Reusability: MCBs are resettable; fuses require replacement
Protection Accuracy: MCBs offer precise current calibration (Type B/C/D curves)
Status Indication: Our MCBs feature visual trip indicators
Our thermal-magnetic MCBs operate through dual protection:
Bimetallic strip bends when overloaded (e.g. 125A sustained)
Solenoid instantly activates during short circuits (>10× rated current)
Both mechanisms trigger the operating mechanism to disconnect contacts within 20ms.
Step-by-step guide for DIN-rail mounting:
De-energize distribution board.
Align MCB with DIN rail (1P/3P variants differ).
Snap onto rail until audible click.
Connect wires: Line (top terminals), Load (bottom terminals).
Tighten terminals to 2.0 N·m torque.
Test operation using manual toggle.
