Description
Features
- In compliance with IEC/EN60947.2
- The maximum connecting ability of 50mm², wiring torque 3N*m, applicable to a variety of installing equipment, wiring stronger
| Electrical features | |
| Rated current In | 63 -125A |
| Poles | 1P 2P 3P 4P |
| Rated voltage Ue | 1P:240/415V~ 2/3/4P:415V~ |
| Insulation voltage Ui | 500v |
| Rated frequency | 50/60Hz |
| Rated breaking capacity | Icu=Ics=6000A |
| Rated impulse withstand voltage(1.2/50) Uimp | 6kV |
| Dielectric test voltage at and find. freq.for 1min | 2kV |
| Pollution degree | 2 |
| Thermo-magnetic release characteristic | (8-12)In |
| Electrical life | 4000 |
| Mechanical life | 10000 |
| Installation | |
| Contact position indicator | Yes |
| Protection degree | IP20 |
| Reference temperature for the setting of the thermal element | 40°℃ |
| Ambient temperature (with daily average ≤35°C) | -5~+40℃ |
| Storage temperature | -25~+70℃ |
| Terminal connection type | Cable/U-type busbar/Pin -type busbar |
| Terminal size top/bottom for cable | 50mm² 18-1/0 |
| Tightening torque | 3.5N* m 31 |
| Mounting | On DIN rail FN 60715 (35mm) by means of the fast clip device |
| Connection | Top and bottom |
What is MCB?
Miniature Circuit Breaker (MCB) is a type of circuit breaker that is small in size. It immediately cuts off the electrical circuit during any unhealthy condition in the electricity supply systems, such as an overcharge or a short-circuit current. Although a user may reset the MCB, the fuse may detect these situations, and the user must replace it.
The MCB is an electromagnetic device that protects electrical wires and loads from inrush current, preventing fires and other electrical risks. MCB is safer to handle, and it recovers power rapidly. For overloading and transient circuit protection in residential applications, the MCB is the most popular choice. MCBs are extremely quick to reset and require no maintenance. The bi-metal complementary idea is used in MCBs to defend against overflow current and short circuit current.
Working Principle of MCB
When an MCB is subject to continuous over-current, the bimetallic strip heats up and bends. An electromechanical latch is released when the MCB deflects the bi-metallic strip. When the user connects this electromechanical clasp to the working mechanism, it opens the microcircuit breaker contacts. Consequently, it causes the MCB to switch off and terminate the current flowing. The user should individually switch on the MCB to restore the current flow. This device guard against defects caused by excessive current, overload, and short circuits.
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