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EWRB theory prep - MCBs questions well answered to pass
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EWRB theory prep - MCBs questions well answered to pass
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EWRB theory prep - MCBstypes of MCB trips - correct answer ✔✔thermal
magnetic
thermal tripping - correct answer ✔✔bi-metal strip, used for overload currents protection
magnetic tripping - correct answer ✔✔magnetic inductor, used for short circuit protection
reset procedure - correct answer ✔✔reset to OFF
reset to ON
arc containment includes - correct 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 - correct 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 - correct answer ✔✔A. trip operating unit
B. control contacts unit
C. arcing ext. unit
D. frame unit
describe (A. trip operating unit ) component function - correct answer ✔✔bi-metal/mag. provides
mechanism for detection of fault current and opens contacts
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