Rated Normal, Short Circuit Making & Breaking, Short Time Current Rating & Operating Duty Cycle of Circuit Breaker

Rated Normal Current: The rated normal current of a circuit-breaker is the r.m.s. value of the current which the circuit breaker can carry continuously and with temperature rise of the various parts within specified limits. The design of contacts and other current carrying parts in the interrupter of the circuit breaker are generally based on … Read more

Why Making Current of Circuit Breaker is more than Breaking Current?

To understand this aspect making current and breaking current, first we should know what actually the making current and breaking current signifies in context with Circuit Breaker. Making Current of a Circuit Breaker is the peak value of maximum current loop during subtransient condition including DC component when Breaker closes. In the figure below, I1 … Read more