CJM1-250L/3300 250A 400V/690V China Factory Electric MCCB Moulded Case Circuit Breaker

Short Description:

Application

CJMM1 series moulded case circuit breaker(hereinafter referred to as circuit breaker) is pplicable for AC 50/60HZ power distribution network circuit with rated insulation voltage of 800V, rated operation voltage of 690V and rated operation current from 10A to 630A, it’s used to distribute power and prevent circuit and power supply equipment from damage due to overload, short circuit, under voltage and other faults, it’s also used for infrequent start of motor as well as overload, short circuit and under voltage protection.This circuit breaker owns advantages of small volume, high breaking capacity, short arcing (or noarcing)etc, it can be equipped with accessories like alarm contact, shunt release, auxiliary contact etc, it’s an ideal product for user. The residual current circuit breaker can either be vertically installed (vertical installation) or be horizontally installed (horizontal installation) The product is in accordance with the standards of IEC60947-2 and Gb140482

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Product Detail

Product Tags

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%

Characteristics of MCCBs

MCCBs are designed with several functions that help protect electrical systems in a safe and reliable manner. Some key features of the MCCB include:

High breaking capacity: Molded case circuit breakers are capable of breaking currents up to thousands of amperes, making them ideal for high-power applications.
Thermal-magnetic trip mechanism: Molded case circuit breakers use a thermal-magnetic trip mechanism to detect and respond to overcurrent and short circuits. Thermal trip elements respond to overloads, while magnetic trip elements respond to short circuits.
Adjustable Trip Setting: MCCBs have an adjustable trip setting, which allows them to be set to the appropriate level for the desired application.
Wide range of frame sizes: MCCBs are available in a variety of frame sizes, which allows them to be used in a variety of applications.Working principle of molded case circuit breaker The operating principle of the MCCB is based on a thermal-magnetic tripping mechanism. The thermal trip element senses the heat generated by the flow of current in the circuit and trips the circuit breaker when the current exceeds the trip rating. The magnetic trip element senses the magnetic field generated by a short circuit in the circuit, tripping the circuit breaker almost immediately.Structure of molded case circuit breaker
The MCCB consists of a molded plastic housing that houses the trip mechanism, contacts and current carrying parts.
The contacts are made of a highly conductive material such as copper, while the trip mechanism consists of a bimetallic strip and a magnetic coil.

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