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

Short Description:

 

  • CJMM3 Moulded case circuit breaker (hereinafter referred to as circuit breaker) has the characteristics of small size, high breaking capacity, short arcing, and anti-vibration. It is suitable for power distribution networks with AC 50Hz, rated operating voltage 400V, and rated operating current up to 250A and below. It is used to distribute electric energy and protect lines and power equipment from overload, short circuit and other faults. It can also be used for infrequent switching in circuits and infrequent starting of motors. The circuit breaker can be installed vertically (that is, vertical installation) or horizontally (that is, horizontally installed).
  • This product complies with IEC60947-2 and GB/T14048.2 “Low-voltage switchgear and control equipment Part 2: Circuit breakers”.

Product Detail

Product Tags

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

Model Frame rating
rated current
In(mA)
Rated
current
In(A)
Rated
working
voltage (V)
Rated
Insulation
voltage (V)
Rated ultimate
short circuit
breaking
capacity Icu(kA)
Rated operating
short-circuit
breaking
capacity Ics(kA)
Number
of
poles
Flashover
distance
(mm)
CJMM3-125S 125 16,20,25,32,
40,50,60,80,
100,125
400/415 1000 25 18 3P ≤50
CJMM3-125H 125 35 25 3P
CJMM3-250S 250 100,125,160,
180,200,225,
250
400/690 800 35/10 25/5 2P,3P,4P ≤50
CJMM3-250S 250 600 50 35

 

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

Test current name I/In Appointed time Starting state
Agreed no tripping current 1.05 2h(In>63A),1h(In≤63A) Cold state
Agreed tripping current 1.3 2h(In>63A),1h(In≤63A) Immediately after the sequence 1 test, start

 

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

Setting current Appointed time Starting state Remark
1.0In >2h Cold state
1.2In ≤2h Immediately after the sequence 1 test, start
1.5In ≤4min cold state 10 ≤ In ≤ 250
≤8min cold state 250 ≤ In ≤ 630
7.2In 4s≤T≤10s cold state 10 ≤ In ≤ 250
6s≤T≤20s cold state 250 ≤ In ≤ 800

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%.

 

CJMM3 MCCB

 

 

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.


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