CJM1E-250M/3300 AC400V 10-630A Compact DIN Rail Moulded Case Circuit Breaker MCCB

Product Model

CJ:Enterprise code
M:Moulded case circuit breaker
1:Design No
□:Rated current of frame
□:Breaking capacity characteristic code/S denotes standard type (S can be omitted)H denotes higher type

Note: There are four types of neutral pole (N pole) for four phases product.The neutral pole of type A is not equipped with over-current tripping element, its always switched on, and it is not switched on or off together with other three poles.
The neutral pole of type B is not equipped with over-current tripping element, and it’s switched on or off together with other three poles(the neutral pole is switched on before being switched off)The neutral pole of type C is equipped with over-current tripping element, and it’s switched on or off together with other three poles(the neutral pole is switched on before being switched off) The neutral pole of type D is equipped with over-current tripping element, it’s always switched on and is not switched on or off together with other three poles.

Table 1

Classification

• By breaking capacity: a standard type(type S) b higher breaking capacity type(type H)
• By connection mode: a front board connection, b back board connection, c plugin type
• By operation mode: a direct handle operation, b rotation handle operation,c electrical operation
• By number of poles: 1P, 2P, 3P, 4P
• By accessory: alarm contact, auxiliary contact, shunt release, under voltage release

Normal Service Condition

• The altitude of the installation site shall not exceed 2000m
• Ambient air temperature
• The ambient air temperature shall not exceed +40℃
• The average value shall not exceed +35℃ with in 24 hours
• The ambient air temperature shall not be less than -5℃
• Atmosphere condition:
• 1There lative humidity of atmosp here shall not exceed 50% at highest temperature of +40℃,and it can be higher atalower temperature,when theaver agelowest temperature in the wettest month doesn’t exceed 25℃ can be 90%,conden sationon product surfacedue to temperature change must be takenin to account.
• The pollution level is class 3

Main Technical Parameter

Outline Installation Size

CJMM1-63, 100, 225, Outline and Installation Sizes (Front board connection)

CJMM1-400,630,800,Outline and Installation Sizes (Front board connection)

Back Board Connection Cut-out Diagram Plug In

MOLDED CASE CIRCUIT BREAKERS (MCCB)

In MCCB, rated short circuit breaking capacity refers to the breaking capacity under specified conditions. After the specified test procedure, it is necessary to consider that the circuit breaker continues to carry its rated current. In order to meet the needs of different users, many circuit breaker manufacturers now divide the short-circuit breaking capacity of the same shell rating current into different levels, and users can choose the appropriate circuit breaker according to their needs from the minimum to the maximum current circuit breakers. They are so common and found in almost any building or structure that they are often taken for granted. Yet, they play an essential role in our electric grid system and should be maintained to keep up with the latest safety standards.

MCCBs provide an instantaneous response to a short circuit fault current, based on the principle of electromagnetism. The MCCB contains a solenoid coil that generates a small electromagnetic field when the current passes through the MCCB. The MCCB uses a temperature sensitive device (the thermal element) with a current sensitive electromagnetic device (the magnetic element) to provide the trip mechanism (thermal magnetic) for thermal protection and isolation purposes. During normal operation or normal conditions, the electromagnetic field generated by the solenoid coil is negligible. However, when a short circuit fault occurs in the circuit, a large current begins to flow through the solenoid and, as a result, a strong electromagnetic field is established which attracts the trip bar and opens the contacts.