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Miniature circuit breaker construction

Miniature Circuit breaker construction

Miniature Circuit breaker construction

Circuit breaker construction

By definition :
Circuit breaker is a device capable of making, carrying and breaking normal load currents and also making and automatically breaking, under pre-determined conditions, abnormal currents such as short-circuits currents. It is usually required to operate infrequently although some types are suitable for frequent operation.

A Din rail mounted miniature circuit breaker (MCB) is the most common in modern domestic consumer units and industrial electrical distribution boards. The MCB includes :
  1. Cable terminals
  2. Bi-metal thermo element
  3. Contacts
  4. Arc chamber
  5. Solenoid
  6. Operating handle - used to manually trip and reset the circuit breaker.
  7. Din rail mounting.


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