Cjm1 Electrical Electronic Adjustable Mould Case Circuit Breakers MCCB

The moulded case circuit breaker is a metal enclosure that holds a set of moving contacts inside. The metal case provides overcurrent protection and can absorb excess voltage surges while the contacts open automatically to relieve the current overload safely. MCCBs come in different ratings, so it’s important to choose the right type according to control panel current rating, short-circuit capacity, insulation requirements, and electrical system voltage. They also have higher interrupt ratings than miniature circuit breakers to serve high-power industrial and commercial applications, such as control panels, OEM, and electrical distribution equipment.

Products Details


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.  

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

Accessory name Electronic release Compound release
Auxiliary contact,under voltage release,alam contact 287 378
Two auxiliary contact sets,alarm contact 268 368
Shunt release, alarm contact, auxiliary contact 238 348
Under voltage release,alarm contact 248 338
Auxiliary contact alarm contact 228 328
Shunt release alarm contact 218 318
Auxiliary contact under-voltage release 270 370
Two auxiliary contact sets 260 360
Shunt release under-voltage release 250 350
Shunt release auxiliary contact 240 340
Under-voltage release 230 330
Auxiliary contact 220 320
Shunt release 210 310
Alarm contact 208 308
No accessory 200 300


  • 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

1 Rated value of circuit breakers
Model Imax (A) Specifications (A) Rated Operation Voltage(V) Rated Insulation Voltage(V) Icu (kA) Ics (kA) Number of Poles (P) Arcing Distance (mm)
CJMM1-63S 63 6,10,16,20 25,32,40, 50,63 400 500 10* 5* 3 ≤50
CJMM1-63H 63 400 500 15* 10* 3,4
CJMM1-100S 100 16,20,25,32 40,50,63, 80,100 690 800 35/10 22/5 3 ≤50
CJMM1-100H 100 400 800 50 35 2,3,4
CJMM1-225S 225 100,125, 160,180, 200,225 690 800 35/10 25/5 3 ≤50
CJMM1-225H 225 400 800 50 35 2,3,4
CJMM1-400S 400 225,250, 315,350, 400 690 800 50/15 35/8 3,4 ≤100
CJMM1-400H 400 400 800 65 35 3
CJMM1-630S 630 400,500, 630 690 800 50/15 35/8 3,4 ≤100
CJMM1-630H 630 400 800 65 45 3
Note: When the test parameters for the 400V, 6A without heating release
2 Inverse time breaking operation characteristic when each pole of overcurrent release for power distribution is powered on at the same time
Item of test Current (I/In) Test time area Initial state
Non-tripping current 1.05In 2h(n>63A),1h(n<63A) Cold state
Tripping current 1.3In 2h(n>63A),1h(n<63A) Proceed immediately after No.1 test
3 Inverse time breaking operation characteristic when each pole of over- current release for motor protection is powered on at the same time.
Setting Current Conventional time Initial State Note
1.0In >2h Cold State
1.2In ≤2h Proceeded immediately after the No.1 test
1.5In ≤4min Cold State 10≤In≤225
≤8min Cold State 225≤In≤630
7.2In 4s≤T≤10s Cold State 10≤In≤225
6s≤T≤20s Cold State 225≤In≤630
4 The instantaneous operation characteristic of circuit breaker for power distribution shall be set as 10in+20%, and the one of circuit breaker for motor protection shall be set as12ln±20%

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