EWRB theory prep – MCBs exam questions with answers
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Course
EWRB
Institution
EWRB
EWRB theory prep – MCBs exam questions with
answers
types of MCB trips - ANSWERS thermal
magnetic
thermal tripping - ANSWERS bi-metal strip, used for overload currents protection
magnetic tripping - ANSWERS magnetic inductor, used for short circuit protection
reset procedure - ANSWERS...
EWRB theory prep – MCBs exam questions with
answers
types of MCB trips - ANSWERS thermal
magnetic
thermal tripping - ANSWERS bi-metal strip, used for overload currents protection
magnetic tripping - ANSWERS magnetic inductor, used for short circuit protection
reset procedure - ANSWERS reset to OFF
reset to ON
arc containment includes - ANSWERS 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 - ANSWERS 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 - ANSWERS A. trip operating unit
B. control contacts unit
C. arcing ext. unit
D. frame unit
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