High Quality CJMM3-250L/3300 250A 3P 35kA 415V 690V MCCB Molded Case Circuit Breaker

Short Description:

CJMM3 Moulded case circuit breaker (hereinafter referred to as circuit breaker) has the characteristics of small size, high breaking capacity, short arcing, and anti-vibration. It is suitable for power distribution networks with AC 50Hz, rated operating voltage 400V, and rated operating current up to 250A and below. It is used to distribute electric energy and protect lines and power equipment from overload, short circuit and other faults. It can also be used for infrequent switching in circuits and infrequent starting of motors. The circuit breaker can be installed vertically (that is, vertical installation) or horizontally (that is, horizontally installed).

This product complies with IEC60947-2 and GB/T14048.2 “Low-voltage switchgear and control equipment Part 2: Circuit breakers”.

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Working And Installation Conditions

The altitude of the installation site does not exceed 2000m.
Ambient air temperature;
The upper limit of ambient air temperature does not exceed +40°C;
The 24-hour average ambient air temperature does not exceed +35°C;
The lower limit of ambient air temperature is not lower than -5°C;
Atmospheric conditions:
The relative humidity of the atmosphere does not exceed 50% when the ambient maximum temperature is +40°C. It can have higher relative humidity at lower temperatures. When the monthly average minimum temperature of the wettest month does not exceed +25°C, the relative humidity of the atmosphere does not exceed +25°C. The average maximum relative humidity is 90%, taking into account condensation on the product surface due to temperature changes.
Pollution level: 3

Product Category

According to the breaking capacity of the circuit breaker, it is divided into: a standard type (S type); b higher type (H type);
According to the wiring method of the circuit breaker: a. Wiring in front of the board; b. Wiring behind the board; c. Plug-in type; d. Pull-out type;
According to the operation mode: a. Direct operation by handle; b. Operation by turning handle; c. Electric operation;
According to the number of poles: two poles; three poles; four poles;
According to accessories: alarm contacts, auxiliary contacts, shunt release, undervoltage release;

Technical Data

Circuit breaker rating

Model	Frame rating rated current In(mA)	Rated current In(A)	Rated working voltage (V)	Rated Insulation voltage (V)	Rated ultimate short circuit breaking capacity Icu(kA)	Rated operating short-circuit breaking capacity Ics(kA)	Number of poles	Flashover distance (mm)
CJMM3-125S	125	16,20,25,32, 40,50,60,80, 100,125	400/415	1000	25	18	3P	≤50
CJMM3-125H	125	16,20,25,32, 40,50,60,80, 100,125	400/415	1000	35	25	3P	≤50
CJMM3-250S	250	100,125,160, 180,200,225, 250	400/690	800	35/10	25/5	2P,3P,4P	≤50
CJMM3-250S	250	100,125,160, 180,200,225, 250	400/690	600	50	35	2P,3P,4P	≤50

Inverse time breaking action characteristics of overcurrent release of distribution circuit breaker when all poles are energized at the same time

Test current name	I/In	Appointed time	Starting state
Agreed no tripping current	1.05	2h(In＞63A),1h(In≤63A)	Cold state
Agreed tripping current	1.3	2h(In＞63A),1h(In≤63A)	Immediately after the sequence 1 test, start

Inverse time breaking action characteristics of overcurrent release of circuit breaker for motor protection when all poles are energized at the same time

Setting current	Appointed time	Starting state	Remark
1.0In	>2h	Cold state
1.2In	≤2h	Immediately after the sequence 1 test, start
1.5In	≤4min	cold state	10 ≤ In ≤ 250
1.5In	≤8min	cold state	250 ≤ In ≤ 630
7.2In	4s≤T≤10s	cold state	10 ≤ In ≤ 250
7.2In	6s≤T≤20s	cold state	250 ≤ In ≤ 800

The instantaneous operating characteristics of the circuit breaker for distribution are set to 10In±20%, and the instantaneous operating characteristics of the circuit breaker for motor protection are set to 12In±20%.