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Ewrb Theory Prep – Mcbs Questions And Answers With Verified Solutions Already Passed Latest Updated 2024 £8.11   Add to cart
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Ewrb Theory Prep – Mcbs Questions And Answers With Verified Solutions Already Passed Latest Updated 2024
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Ewrb Theory Prep – Mcbs Questions And Answers With Verified Solutions Already Passed Latest Updated 2024

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  • October 17, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • types of mcb trips
  • thermal tripping
  • magnetic tripping
  • arc control factors
  • ewrb theory prep mcbs questions and answers with

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  • Ewrb
  • Ewrb

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Ewrb Theory Prep – Mcbs Questions
And Answers With Verified Solutions
Already Passed Latest Updated 2024
types of MCB trips - ANSWER✔✔thermal
magnetic

thermal tripping - ANSWER✔✔bi-metal strip, used for overload currents
protection

magnetic tripping - ANSWER✔✔magnetic inductor, used for short circuit
protection

reset procedure - ANSWER✔✔reset to OFF
reset to ON

arc containment includes - ANSWER✔✔horns carry current to chute, allow arc to
jump out
arc chute lengthens distance for arc to travel
oil suppresses arc
splitter plates split the arc

arc control factors - ANSWER✔✔reduced horns width minimize arc x section
more plates split arc into multiple smaller voltages
maximize arc chute increases travel distance for arc

Four key parts of MCBs - ANSWER✔✔A. trip operating unit
B. control contacts unit
C. arcing ext. unit
D. frame unit

describe (A. trip operating unit ) component function - ANSWER✔✔bi-
metal/mag. provides mechanism for detection of fault current and opens contacts

describe (B. control contacts unit ) component function - ANSWER✔✔contacts
allows the supply current to flow during normal running when MCB is closed

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