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Induction Motor Interview Questions with Answers | Part-1

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How M.C.B. works???!!!

How M.C.B. works???!!!


mcb
How M.C.B. works???!!!


Basic information
  • MCB is the one type of electromechanical device and which is used for protection purpose at various places.

  • MCB is the also one type of switching device. So MCB is required for safety purpose.

  • MCB operates and disconnect the circuit of home appliances against electrical short circuit and high current.

Principle of Operation


  • There are mainly two principle are used in working of MCB
  1. Magnetic Principle ( For short circuit protection)
  2. Thermal principle  ( For overload protection)

Circuit Diagram of MCB
Circuit Diagram of MCB
Circuit Diagram of MCB



Working of MCB


  • When over current flowing then the heat will be produced then the thermal operation is achieved.

  • So during thermal operation, the latch mechanism will be released and contact make be open.

  • So we tell that MCB will be work by inverse time-current characteristics means short time required or greater current for operate the MCB.

  • Now, when short circuit will be occurs then the current will be increases and solanoid operates plunger to strike the strip lever so latch mechanism will be released.

  • Due to high magnetic solanoid oparation, contact will be open rapidly.

Advantages of MCB


  • Maintenance cost is less.
  • Replacement cost is less.
  • Very safe electrically.
  • Simple Operation.
  • Identification of fault in the circuit is very easy.
  • Resume the supply is very simple.

Disadvantages of MCB


  • This device is very costlier.

Application of MCB


  • MCB required at
  • Home, Office,
  • Shops, Colleges,
  • Hospitals, 
  • Huge buildings
  • ETC...
  • It is used in place of rewireable fuse.

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