In low-voltage power distribution systems, circuit breakers are crucial for ensuring safe and stable operation. Among various types of circuit breakers, MCCB (Molded Case Circuit Breaker) stands out for its high current-carrying capacity and reliable protection performance, becoming an core component in industrial and commercial power distribution scenarios. Zhejiang C&J Electrical co., ltd. (referred to as C&J Electrical) has launched the CJMM3 series MCCB, which provides comprehensive and reliable protection for low-voltage power distribution lines and equipment.
Core Definition & Characteristics of MCCB
Molded case circuit breakers (MCCBs) can protect circuits from 16 amps to 3200 amps and are typically used as main circuit breakers in switchboards or to directly power large equipment. They are ideal for buildings or factories with high requirements for low-voltage power supply. As a type of low-voltage circuit breaker, MCCB is named for its enclosed shell made of molded insulating material, which can effectively protect internal components from external environmental impacts and prevent electric arcs from escaping during operation.
Compared with small circuit breakers (such as MCB), MCCB has obvious advantages in handling large currents and short-circuit capacities. It can adapt to complex power distribution environments and provide stable protection for high-power equipment and main distribution lines. Its core characteristics include large rated current range, adjustable protection parameters, diverse installation methods, and strong environmental adaptability.
Core Functions of MCCB
As a professional low-voltage protective component, MCCB integrates multiple protection functions to form a comprehensive safety defense line for power distribution systems:
- Overload protection: Real-time monitoring of circuit current; when the current exceeds the rated value for a long time, the thermal release acts to cut off the circuit, preventing overheating damage to wires and equipment
- Short circuit protection: When a short circuit fault occurs, the magnetic release quickly acts within milliseconds to cut off the circuit, suppressing the rapid rise of short-circuit current and avoiding serious accidents such as equipment burnout
- Current carrying & connection: Stably carry and connect current under normal circuit conditions, ensuring the smooth operation of the power distribution system
- Abnormal current breaking: Reliably break current under specified abnormal circuit conditions, isolating faulty parts to prevent fault expansion
- Auxiliary protection: Provide auxiliary protection functions for lines and equipment in specific scenarios, improving the safety and stability of the power distribution system
C&J Electrical’s CJMM3 Series MCCB: Core Advantages & Technical Specifications
C&J Electrical’s CJMM3 series molded case circuit breaker (MCCB) is a high-performance protective component designed for low-voltage power distribution lines. It can connect, carry and maintain normal circuit conditions, and also connect, carry and break current under specified abnormal conditions. As a mechanical switch, it provides protection for lines and equipment in case of overload, short circuit or other distribution line faults (auxiliary function). Its core advantages, characteristics and technical parameters are as follows:
Core Product Features & Advantages
- Wide frame rating range: 125A, 160A, 250A, 400A, 630A, adapting to different current demand scenarios
- Dual rated working voltage options: 400/415V, 690V, compatible with various low-voltage power supply systems
- Multiple breaking capacity levels: Covering commonly used breaking capacities in power distribution fields – 20kA, 36kA, 50kA, meeting different short-circuit protection requirements
- Diverse pole configurations: Including 2-pole, 3-pole and 4-pole products, suitable for single-phase and three-phase power distribution systems
- Two release types: Single magnetic type and thermal-magnetic type, optional according to protection needs
- Flexible installation methods: Fixed type, plug-in type and withdrawable type, facilitating installation, maintenance and replacement
- Broad application scope: Widely used in construction of low-voltage power consumption places, industrial fields and OEM industries
Key Technical Parameters
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Parameter
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Details
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Standard
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IEC60947-2
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Pole configuration
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3P, 4P
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Rated current (A)
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16-630A
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Electrical life
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5000 cycles
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Impulse withstand voltage
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8kV
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Rated insulation voltage
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800V
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Installation method
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35mm rail mounting
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Versatile Application Scenarios of CJMM3 Series MCCB
With excellent performance and wide adaptability, the CJMM3 series MCCB is widely used in various low-voltage power distribution scenarios, including:
- Industrial factories: Main power distribution switchboards, production line equipment power supply protection, workshop power distribution lines
- Commercial buildings: Shopping malls, hotels, office buildings – main distribution cabinets, central air conditioning systems, elevator power supply protection
- Infrastructure projects: Transportation hubs (airports, stations), water treatment plants, power station auxiliary low-voltage systems
- Construction fields: Construction site temporary power distribution systems, residential community power distribution rooms
- OEM industries: Matching equipment for electrical equipment manufacturers, such as power distribution components for industrial control cabinets
- Public facilities: Hospitals, schools, stadiums – important power supply system protection (such as medical equipment, emergency power supplies)
Why Choose C&J Electrical’s CJMM3 Series MCCB?
In the field of MCCB, the CJMM3 series from C&J Electrical has obvious competitive advantages:
- Reliable protection performance: Complies with IEC60947-2 standard, with stable overload and short circuit protection capabilities, ensuring the safety of power distribution systems
- Strong adaptability: Wide range of frame ratings, breaking capacities and installation methods, meeting diverse application needs
- Durable and long-lasting: Excellent electrical life (5000 cycles) and high impulse withstand voltage, adapting to long-term stable operation in complex environments
- Safe and reliable structure: Molded case design effectively isolates internal components, preventing arc escape and improving operation safety
- Professional after-sales support: C&J Electrical provides professional technical consultation and after-sales service, ensuring smooth application of products
Get in Touch
If you have any questions about the CJMM3 series MCCB, such as product specifications, technical details, customization needs, or bulk orders, please feel free to contact C&J Electrical. Our professional team will provide you with tailored low-voltage power distribution protection solutions to ensure the safe and stable operation of your power system.
Post time: Dec-29-2025