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As a leading manufacturer in electrical protection, Jinhua Dika Electrical Equipment Co., Ltd. is proud to present our high-performance 40A 4P MCCB (Molded Case Circuit Breaker). Designed for reliability in demanding 400V applications, this circuit breaker embodies our commitment to quality and safety, backed by a robust manufacturing process and comprehensive quality management systems. We understand the critical need for dependable circuit protection in industrial and commercial settings, and this product is engineered to meet those challenges head-on, ensuring the safety of your electrical infrastructure and personnel.
This 40A 4P MCCB is a versatile and robust protective device engineered for three-phase electrical systems with a neutral. Its primary function is to automatically interrupt electrical flow in the event of overloads or short circuits, preventing damage to downstream equipment and mitigating fire hazards. The four-pole design is essential for systems where complete isolation of all live conductors and the neutral is required, offering enhanced safety during maintenance and a higher level of protection against certain fault conditions.
Key Features and Technical Advantages:
- Precise Protection: Equipped with a reliable thermal-magnetic trip unit, the breaker offers dual protection. The thermal element responds to sustained overloads, while the magnetic element provides instantaneous tripping for high-magnitude short-circuit currents, ensuring rapid and selective fault clearance.
- Robust Construction: The molded case is manufactured from high-grade, flame-retardant, and tracking-resistant materials, providing excellent dielectric strength, mechanical durability, and protection against environmental contaminants.
- High Breaking Capacity: Designed to safely interrupt high fault currents, this MCCB helps maintain the integrity of your electrical distribution system under severe short-circuit conditions, protecting connected assets.
- Clear Status Indication: Features a user-friendly ON/OFF (I/O) toggle handle with a clear trip position indicator, allowing for quick visual confirmation of the breaker's status, which is crucial for troubleshooting and operational safety.
- Flexible Mounting: Available in both fixed and plug-in versions, offering flexibility for panel design, easier replacement, and reduced downtime during maintenance.
- Secure Connection: Utilizes durable screw or stud terminals designed for secure and low-resistance connections with copper or aluminum conductors, ensuring long-term reliability and minimizing heat generation.
Detailed Technical Specifications:
| Parameter | Specification |
| Rated Operational Current (In) | 40 Amperes |
| Number of Poles | 4 Poles (3 Phase + Neutral) |
| Rated Operational Voltage (Ue) | 400V AC, 50/60Hz |
| Rated Insulation Voltage (Ui) | 690V AC |
| Trip Unit Type | Thermal-Magnetic (Standard) |
| Ultimate Breaking Capacity (Icu) | Options available (e.g., 25kA, 36kA, 50kA) |
| Electrical Durability | Up to 10,000 operations |
| Mechanical Durability | Up to 20,000 operations |
| Mounting | Fixed or Plug-in (Optional) |
| Standards | IEC 60947-2, GB 14048.2 |
Benefits for Your Business:
- Enhanced System Safety: Provides reliable protection against electrical faults, safeguarding valuable machinery, data centers, and commercial equipment from damage.
- Reduced Downtime: The quick and selective tripping mechanism helps localize faults, making it easier to identify and resolve issues, thereby minimizing operational interruptions.
- Operational Flexibility: The 4-pole design is suitable for a wide range of applications, including main distribution boards, motor control centers, and generator sets, where full circuit isolation is necessary.
- Long Service Life: Built with high-quality components and designed for numerous operations, this MCCB offers a long lifespan, reducing the total cost of ownership through fewer replacements.
- Global Compliance: Manufactured with international electrical standards in mind, facilitating its use in projects worldwide.
Choosing Jinhua Dika means partnering with a manufacturer that has a proven track record. With an annual export value ranging between US$1 Million and US$1.5 Million, we serve a diverse global market spanning North America, Europe, Asia, Africa, and Oceania. Our products, including this 40A 4P MCCB, are shipped from major Chinese ports like Shanghai, Tianjin, Guangzhou, and Ningbo, ensuring efficient logistics. Our operations are guided by a commitment to quality, as reflected in our adherence to recognized management standards. This 400V rated circuit breaker is more than just a component; it's a reliable safeguard for your electrical investments. Contact us today to discuss your requirements, request samples, or learn more about our full range of electrical protection solutions.
Frequently Asked Questions (FAQ)
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Q: What is the main application for a 4-pole MCCB versus a 3-pole one?
A: A 4-pole MCCB (3 phases + neutral) is used in systems where it is necessary to also switch or isolate the neutral conductor. This is common in TN-S or TT earthing systems, for generator sets, as a main incoming breaker, or in applications where complete electrical isolation is required for safety during maintenance. -
Q: Can this 40A breaker be used for motor protection directly?
A: While it offers overload and short-circuit protection, for dedicated motor protection, a motor protection circuit breaker (MPCB) or a combination with a dedicated motor starter is often recommended. This MCCB can be used as a backup or feeder protection for motor circuits. -
Q: What does the "400V Rated Voltage" signify?
A: This indicates the maximum system voltage for which the circuit breaker is designed to operate safely and reliably under normal conditions. It is suitable for common three-phase low-voltage networks operating at 400V AC (line-to-line voltage). -
Q: Are different breaking capacity (Icu) options available?
A: Yes. The standard product is offered with a specific Icu rating, but other ratings (e.g., 25kA, 36kA, 50kA) are typically available. The required breaking capacity depends on the prospective short-circuit current at the installation point. -
Q: Is the trip curve adjustable?
A: The standard thermal-magnetic version has fixed settings. For applications requiring adjustable overload or short-time settings, electronic trip unit versions may be available as an option or upon request. -
Q: What is the difference between fixed and plug-in mounting types?
A: Fixed breakers are bolted directly to the panel. Plug-in breakers mount onto a fixed base, allowing for quicker removal and replacement without wiring the load side, which can reduce maintenance time. -
Q: What conductor types and sizes are compatible with the terminals?
A: The terminals are designed to accommodate both copper and aluminum conductors. The specific range of compatible cross-sectional areas (e.g., 10-25 mm²) will be detailed in the product datasheet. -
Q: Do you provide technical support or customization for large projects?
A: Yes. As a manufacturer, we offer technical support for product selection and integration. Customization options, such as specific auxiliary contacts, shunt trips, or under-voltage releases, can be discussed based on project specifications.
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