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Product Introduction
The DC types of mcb in electrical series miniature DC circuit breakers are suitable for overload and short-circuit protection of lines, lighting, and power equipment in DC circuits with a maximum rated voltage of 1000V and a rated current of 63A and below. They can also be used for infrequent switching of lines and equipment under normal conditions.
Technical Parameters
|
Product Model |
KNS3D-63F7A |
|
Meets standards |
IEC60947-2 |
|
Rated voltage (V) |
250V(1P),500V(2P),750V(3P),1000V(4P) |
|
Rated current (A) |
1A,2A,3A;4A,6A,10A,16A,20A,25A,32A,40A,50A,63A |
|
Extreme number |
1P,2P,3P,4P |
|
Rated short-circuit breaking capacity (kA) |
6A |
|
Instantaneous disconnector type and disconnect current |
8-12In |
|
Maximum cross-sectional area of connecting wire (25mm²) |
25 |
|
Electromechanical lifespan (times) |
10000 |
Overcurrent Time-Operating Characteristics
|
Test |
Test current |
initial state |
Time limit for disengagement or non-disengagement |
Expected results |
Test ambient temperature |
|
a |
1.05In |
cold state |
t ≤1h(In≤63A) |
Non-dismounting |
30°C～35°C |
|
b |
1.3In |
Following test a |
t＜1h(In≤63A) |
Snap |
30°C～35°C |
|
c |
8In |
cold state |
t≤0.2s |
Non-dismounting |
30°C～35°C |
|
d |
12In |
cold state |
t＜0.2s |
Snap |
30°C～35°C |
|
The wiring is suitable for copper wires of 25mm² or less (see table below). The wiring method is to tighten the wires with screws with a torque of 2.0 N·m. |
|
|
Rated current In (A) |
Nominal cross-sectional area of copper conductor (mm²) |
|
1～6 |
1 |
|
10 |
1.5 |
|
16,20 |
2.5 |
|
25 |
4 |
|
32 |
6 |
|
40,50 |
10 |
|
63 |
16 |
Working Conditions
|
Temperature |
The ambient air temperature should not exceed +40℃, should not be lower than -5℃, |
|
High |
The altitude of the installation site should not exceed 2000m; if higher altitudes are required, derating should be performed according to IEC 61439 Technical Requirements for Low-Voltage Electrical Appliances for High-Altitude Use under Special Environmental Conditions. |
|
Atmospheric conditions |
At +40℃, the relative humidity should not exceed 50%, and higher relative humidity is permissible at lower temperatures; at an ambient air temperature of 55℃, the relative humidity should be ≤95%. |
|
Resistance to damp heat |
The average minimum temperature of the wettest month shall not exceed +25°C, and the average maximum relative humidity of that month shall not exceed 90%, taking into account condensation on the product surface caused by temperature changes. |
|
Pollution level |
Level 2 |
|
Installation Category |
Ⅱ,Ⅲ |
|
Installation method |
Installed using TH35-7.5 type mounting rail. |
|
Installation conditions |
The inclination of the mounting surface from the vertical plane should not exceed 5°. |
|
If condensation occurs on the product due to temperature changes, measures must be taken. |
|
Video
Appearance And Installation Method
Questions and Answers
Q: Can MCB be used as a switch?
A: MCB can function as an ON-OFF switch, allowing manual control of the circuit. However, it is important to note that an MCB should not be used as a frequent switching device, as its primary purpose is to protect the circuit from over currents rather than serve as a general-purpose switch.
Q: Can EA63s MCB be reset after tripping?
A: Yes, most MCB are designed to be manually reset after tripping. Once the fault or over current condition has been resolved, the MCB can be switched back to the ON position to restore power to the circuit.
Q: What is the difference between an EA63s MCB and a fuse?
A: EA63s MCB and a fuse both serve the purpose of protecting electrical circuits from over currents. However, the main difference is that an MCB can be manually reset after tripping, while a fuse requires replacement once it blows. EA63s MCB offer convenience and cost-effectiveness in the long run compared to fuses.
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