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.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 | ||||||
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
| 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% |