Miniature Circuit Breaker (MCB) CJM2-63-2

CJM2-63-2 Type miniature circuit breaker (MCB) is mainly used for protection against overload and the short circuit under the AC 50Hz/60Hz, rated voltage 230V/400V, and rated current from 1A to 63A. It also can be used for non-frequent on-and-off switch operations under normal circumstances.

Products Details

Construction and Feature

  • High short-short capacity 10KA
  • Designed to protect circuit carrying big current up to 63A
  • Contact position indication
  • Used as main switch in household and similar installation


Standard IEC/EN 60898-1
Pole No 1P,1P+N, 2P, 3P,3P+N,4P
Rated voltage AC 230V/400V
Rated Current(A) 1A,2A,3A,4A,6A,10A,16A,20A,25A,32A,40A,50A,63A
Tripping curve B, C, D
Rated short-circuit capacity(lcn) 10000A
Rated frequency 50/60Hz
Rated impulse withstand voltage Uimp 4kV
Connection terminal Pillar terminal with clamp
Mechanical life 20,000 Cycles
Electrical life 4000 Cycles
Protection degree IP20
Connection capacity Flexible conductor 35mm²
Rigid conductor 50mm²
Installation On symmetrical DIN rail 35mm
Panel mounting

Overload Current Protection Characteristics

Test Tripping Type Test Current Initial State Tripping timeor Non-tripping Time Provisior
a Time-delay 1.13In Cold t≤1h(In≤63A) t≤2h(ln>63A) No Tripping
b Time-delay 1.45In After test a t<1h(In≤63A) t<2h(In>63A) Tripping
c Time-delay 2.55In Cold 10s<t<60s(In≤63A) 20s<t<120s(In>63A) Tripping
d B curve 3In Cold t≤0.1s No Tripping
C curve 5In Cold t≤0.1s No Tripping
D curve 10In Cold t≤0.1s No Tripping
e B curve 5In Cold t≤0.1s Tripping
C curve 10In Cold t≤0.1s Tripping
D curve 20In Cold t≤0.1s Tripping

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.

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