Cjm1 Electrical Electronic Adjustable Mould Case Circuit Breakers MCCB

Short Description:

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.

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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	6,10,16,20 25,32,40, 50,63	400	500	15*	10*	3,4	≤50
CJMM1-100S	100	16,20,25,32 40,50,63, 80,100	690	800	35/10	22/5	3	≤50
CJMM1-100H	100	16,20,25,32 40,50,63, 80,100	400	800	50	35	2,3,4	≤50
CJMM1-225S	225	100,125, 160,180, 200,225	690	800	35/10	25/5	3	≤50
CJMM1-225H	225	100,125, 160,180, 200,225	400	800	50	35	2,3,4	≤50
CJMM1-400S	400	225,250, 315,350, 400	690	800	50/15	35/8	3,4	≤100
CJMM1-400H	400	225,250, 315,350, 400	400	800	65	35	3	≤100
CJMM1-630S	630	400,500, 630	690	800	50/15	35/8	3,4	≤100
CJMM1-630H	630	400,500, 630	400	800	65	45	3	≤100
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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