China Manufacturer CJMM3-400 3P 400A Moulded Case Circuit Breaker MCCB for short-circuit protection

Working And Installation Conditions

• The altitude of the installation site does not exceed 2000m.
• Ambient air temperature;
• The upper limit of ambient air temperature does not exceed +40°C;
• The 24-hour average ambient air temperature does not exceed +35°C;
• The lower limit of ambient air temperature is not lower than -5°C;
• Atmospheric conditions:
• The relative humidity of the atmosphere does not exceed 50% when the ambient maximum temperature is +40°C. It can have higher relative humidity at lower temperatures. When the monthly average minimum temperature of the wettest month does not exceed +25°C, the relative humidity of the atmosphere does not exceed +25°C. The average maximum relative humidity is 90%, taking into account condensation on the product surface due to temperature changes.
• Pollution level: 3

Product Category

• According to the breaking capacity of the circuit breaker, it is divided into: a standard type (S type); b higher type (H type);
• According to the wiring method of the circuit breaker: a. Wiring in front of the board; b. Wiring behind the board; c. Plug-in type; d. Pull-out type;
• According to the operation mode: a. Direct operation by handle; b. Operation by turning handle; c. Electric operation;
• According to the number of poles: two poles; three poles; four poles;
• According to accessories: alarm contacts, auxiliary contacts, shunt release, undervoltage release;

Technical Data

Circuit breaker rating

Inverse time breaking action characteristics of overcurrent release of distribution circuit breaker when all poles are energized at the same time

Inverse time breaking action characteristics of overcurrent release of circuit breaker for motor protection when all poles are energized at the same time

The instantaneous operating characteristics of the circuit breaker for distribution are set to 10In±20%, and the instantaneous operating characteristics of the circuit breaker for motor protection are set to 12In±20%.

The different betweent the M1 series and the M3 series MCCB

Moulded case circuit breakers (MCCB) are important components in electrical systems, providing overload and short-circuit protection. When it comes to MCCBs, the M1 series and M3 series are two popular options, each with its own features and capabilities. Understanding the differences between these series can help users make informed decisions when selecting the MCCB that best suits their specific requirements.

The M1 Series MCCB is designed for applications where standard performance is sufficient. It provides reliable protection for circuits and equipment, with features such as adjustable thermal and magnetic trip settings. Suitable for a variety of industrial and commercial applications, the M1 Series provides cost-effective protection without compromising quality and safety.

M3 series molded case circuit breakers, on the other hand, are designed to meet the needs of more complex and critical electrical systems. It offers advanced protection features including adjustable thermal release and magnetic release, as well as additional options for ground fault protection and communication capabilities. The M3 Series is ideal for applications requiring enhanced performance and flexibility, such as large industrial facilities and critical infrastructure installations.

One of the main differences between the M1 and M3 series MCCBs is their performance and functionality. The M1 Series provides reliable protection for standard applications, while the M3 Series offers advanced features and options for more demanding environments. In addition, the M3 series may have a higher breaking capacity than the M1 series and can break higher fault currents.

In summary, the selection of M1 and M3 series molded case circuit breakers depends on the specific requirements of the associated electrical system. The M1 Series provides cost-effective protection for standard applications, while the M3 Series offers advanced features and capabilities for more complex and critical installations. Understanding the differences between these series is critical to selecting the most appropriate molded case circuit breaker to ensure the safety and reliability of your electrical system.