Product Description
Structural Characteristics
·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".
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;
Main Technical Parameter
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 |
35 |
25 |
3P |
| CJMM3-250S |
250 |
100,125,160,
180,200,225,
250 |
400/690 |
800 |
35/10 |
25/5 |
2P,3P,4P |
≤50 |
| CJMM3-250S |
250 |
600 |
50 |
35 |
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 |
| ≤8min |
cold state |
250 ≤ In ≤ 630 |
| 7.2In |
4s≤T≤10s |
cold state |
10 ≤ In ≤ 250 |
| 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%.
Outline Installation Size
About Us
More products
Audited Supplier 
){kind=link}
){kind=link}