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Rupturing capacity:
Rupturing capacity or breaking capacity expresses the current that a circuit breaker is capable of breaking at a given recovery voltage under certain set conditions of operation. It is expressed in MVA The set conditions are power factor,recovery voltage and rate of rise of restriking voltage. When the current broken is symmetrical it is called symmetrical breaking capacity. When the current broken is asymmetrical it is called asymmetrical breaking capacity. It is common to designate circuit breaker capacity based on asymmetrical breaking capacity. Breaking capacity of a circuit breaker =√3xVxIx10-6MVA Short circuit breaking capacity: It is the highest value of short circuit current which a circuit breaker is capable of breaking under specified conditions of transient recovery voltage and power frequency voltage. It is expressed in kA. The breaking current is expressed in two ways
1)The r.m.s value of a.c component of current at the instant of contact separtation.
2)The percentage of d.c component of current at the instant of contact separtation. While selecting the circuit breaker for a particular location in the power system the fault level at that point is determined.
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