Miniature Circuit Breaker (MCB) CJM7-125

CJM7-125 Miniature circuit breakers (MCBs) ensure electrical safety in homes and similar situations, such as offices and other buildings as well as for industrial applications by protecting electrical installations against overloads and short circuits. Once a fault is detected, the miniature circuit breaker automatically switches off the electrical circuit to prevent damage to wires and to avoid the risk of fire. Warranting reliability and safety for people and assets, MCBs are equipped with two tripping mechanisms: the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection. normally the rated current is 63, 80, 100A and rated voltage is 230/400VAC. frequency is 50/60Hz. according to IEC60497/EN60497 standards.
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Products Details

Construction and Feature

  • High short-short capacity 10KA.
  • Designed to protect circuit carrying big current up to 125A.
  • Contact position indication.
  • Used as main switch in household and similar installation.
  • Low energy consumption and significant energy conservation
  • Improve the production and ecological environment and economize equipment maintenance
  • Overload protection
  • Close quickly
  • High breaking capacity

Safe and Reliable

  • Automatic close with less electric spark for extended working life of appliances
  • Protection degree: IP20---To guarantee a safe and reliable connection
  • Stain-resistance: Level 3---To prevent dust and conductive pollution

Specification

Standard IEC/EN60947-2
Pole No 1P, 2P, 3P, 4P
Rated voltage AC 230V/400V
Rated Current(A) 63A, 80A, 100A
Tripping curve C, D
Rated short-circuit capacity(lcn) 10000A
Rated service short-circuit capacity(Ics) 7500A
Protection degree IP20
Reference temperature for the setting of the thermal element 40℃
Ambient temperature (with daily average ≤35°C) -5~+40℃
Rated frequency 50/60Hz
Rated impulse withstand voltage 6.2kV
Electro-mechanical endurance 10000
Connection capacity Flexible conductor 50mm²
Rigid conductor 50mm²
Installation On symmetrical DIN rail 35.5mm
Panel mounting

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. 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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