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EWRB THEORY PREP - MCBS EXAM QUESTIONS WITH ANSWERS 100% GUARANTEED PASS LATEST UPDATE $9.99   Add to cart

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EWRB THEORY PREP - MCBS EXAM QUESTIONS WITH ANSWERS 100% GUARANTEED PASS LATEST UPDATE

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EWRB THEORY PREP - MCBS EXAM QUESTIONS WITH ANSWERS 100% GUARANTEED PASS LATEST UPDATE types of MCB trips thermal magnetic thermal tripping bi-metal strip, used for overload currents protection magnetic tripping magnetic inductor, used for short circuit protection reset procedure reset to ...

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  • October 5, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
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EWRB THEORY PREP - MCBS EXAM QUESTIONS WITH


ANSWERS 100% GUARANTEED PASS LATEST UPDATE

types of MCB trips


thermal


magnetic


thermal tripping


bi-metal strip, used for overload currents protection


magnetic tripping


magnetic inductor, used for short circuit protection


reset procedure


reset to OFF


reset to ON

, arc containment includes


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


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


A. trip operating unit


B. control contacts unit


C. arcing ext. unit


D. frame unit

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