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EWRB theory prep - MCBs WITH 100- CORRECT ANSWERS
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EWRB theory prep - MCBs WITH 100- CORRECT ANSWERS
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10/5/24, 11:59 AMEUNICE
EWRB theory prep – MCBs WITH 100% CORRECT ANSWERS
Terms in this set (23)
thermal
types of MCB trips
magnetic
thermal tripping bi-metal strip, used for overload currents protection
magnetic tripping magnetic inductor, used for short circuit protection
reset to OFF
reset procedure
reset to ON
horns carry current to chute, allow arc to jump out
arc chute lengthens distance for arc to travel
arc containment includes
oil suppresses arc
splitter plates split the arc
reduced horns width minimize arc x section
arc control factors more plates split arc into multiple smaller voltages
maximize arc chute increases travel distance for arc
A. trip operating unit
B. control contacts unit
Four key parts of MCBs
C. arcing ext. unit
D. frame unit
describe (A. trip operating unit ) bi-metal/mag. provides mechanism for detection of fault current and opens contacts
component function
describe (B. control contacts unit ) contacts allows the supply current to flow during normal running when MCB is
component function closed
describe (C. arcing ext. unit ) component all inclusive factors - horns, chamber chutes, oils, splitter plates, used to control and
function extinguish fault arc
describe (D. frame unit ) component molded case exterior provides a rigid, mechanically strong, insulated housing for
function MCB parts
Low Voltage MCB rating 600V
circuit breaker contacts cannot be made of iron. heat breakdown & low CCA
____
circuit breaker purpose detect SC/OL and break contact on fault detection
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