Question
Download Solution PDFWhile calculating the rating capacity of a circuit breaker, \(\frac{\text { Making capacity }}{\text { Breaking capacity }}\) = ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFRelationship between making and breaking current capacity
The rated breaking capacity is the maximum fault current a circuit breaker can successfully interrupt without damage.
It is always expressed in KVA and the current corresponding to breaking capacity is known as the breaking current.
The breaking current is given by:
\(I_b={MVA\over \sqrt{3}\times V_{L}}\)
where, Ib = Breaking current capacity
MVA = Apparent power
VL = Line-to-line voltage
The relationship between making and breaking current is:
\(I_m=2.55\times I_b\)
where, Im = Making current
Ib = Breaking current
\(\frac{\text { Making capacity }}{\text { Breaking capacity }}=2.55\)
Last updated on May 29, 2025
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