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EWRB theory prep – MCBs Exam Questions with Complete Solutions $11.49   Add to cart

Exam (elaborations)

EWRB theory prep – MCBs Exam Questions with Complete Solutions

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  • Course
  • EWRB
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  • EWRB

EWRB theory prep – MCBs Exam Questions with Complete Solutions

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  • September 13, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • EWRB
  • EWRB
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KenAli
EWRB theory prep – MCBs Exam
Questions with Complete Solutions

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



describe (C. arcing ext. unit ) component function - ANSWER all inclusive factors -

horns, chamber chutes, oils, splitter plates, used to control and extinguish fault arc



describe (D. frame unit ) component function - ANSWER molded case exterior provides

a rigid, mechanically strong, insulated housing for MCB parts



Low Voltage MCB rating - ANSWER 600V



circuit breaker contacts cannot be made of ____ - ANSWER iron. heat breakdown & low

CCA



circuit breaker purpose - ANSWER detect SC/OL and break contact on fault detection

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