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EWRB theory prep - MCBs exam with complete solutions 2024_2025
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EWRB theory prep - MCBs exam with complete solutions 2024_2025
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EWRB theory prep - MCBs exam withcomplete solutions 2024/2025
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
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