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Nowadays we use more commonly miniature circuit breaker or MCB in low voltage electrical network instead of fuse.
The MCB has some advantages compared to fuse.
- It automatically switches off the electrical circuit during abnormal condition of the network means in over load condition as well as faulty condition. The fuse does not sense but miniature circuit breaker does it in more reliable way. MCB is much more sensitive to over current than fuse.
- Another advantage is, as the switch operating knob comes at its off position during tripping, the faulty zone of the electrical circuit can easily be identified. But in case of fuse, fuse wire should be checked by opening fuse grip or cutout from fuse base, for confirming the blow of fuse wire.
- Quick restoration of supply can not be possible in case of fuse as because fuses have to be rewirable or replaced for restoring the supply. But in the case of MCB, quick restoration is possible by just switching on operation.
- Handling MCB is more electrically safe than fuse. Because of to many advantages of MCB over fuse units, in modern low voltage electrical network, miniature circuit breaker is mostly used instead of backdated fuse unit.
Internal Structure
Feature
1.Protection against both overload and short circuit
2.Contact position indication
3.Applicable to terminal and pin/fork type Busbar connection
4.Easy mounting onto 35mm DIN rail
Technical parameter
|
Model Name |
MK7-63/4P |
|
Pole No: |
4P |
|
Rated voltage: |
AC 110V 220V 415V |
|
Rated current(A): |
6-63A You can choose |
|
Tripping curve: |
C |
|
Rated short-circuit capacity(lcn): |
6kA |
|
Rated frequency: |
50/60Hz |
|
Energy limiting class: |
3 |
|
Rated impulse withstand voltage: |
6.2kV |
|
Electro-mechanical endurance: |
≥ 6000 |
|
Contact position indication |
Yes, Green and Red |
|
Connection terminal: |
Screw terminal / Pillar terminal with calmp |
|
Connection capacity: |
Rigid conductor up to 25mm² |
|
Fastening torque: |
2.0Nm |
|
Installation: |
On symmetrical DIN rail 35mm / Panel mounting |
Operating Mechanism of Miniature Circuit
Breaker
The operating mechanism of miniature circuit breaker provides the means of manual opening and closing operation of miniature circuit breaker. It has three-positions “ON,” “OFF,” and “TRIPPED”. The external switching latch can be in the “TRIPPED” position, if the MCB is tripped due to over-current. When manually switch off the MCB, the switching latch will be in “OFF” position. In close condition of MCB, the switch is positioned at “ON”. By observing the positions of the switching latch one can determine the condition of MCB whether it is closed, tripped or manually switched off.
Certificate
Dimension:
Production Base:
Workshop
Warehouse
Shippment
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