A circuit breaker is a consequently worked electrical change intended to shield an electrical circuit from harm brought about by abundance flow from an over-burden or short out. Its fundamental capacity is to intrude on current stream after a flaw is distinguished. In contrast to a wire, which works once and afterward should be supplanted, an electrical switch can be reset (either physically or naturally) to continue ordinary activity. Circuit breakers are made in shifting sizes, from little gadgets that ensure low-current circuits or individual family unit apparatus, up to huge switchgear intended to secure high voltage circuits taking care of a whole city. The nonexclusive capacity of an electrical switch, or wire, as a programmed methods for expelling power from a broken framework is regularly truncated as OCPD (Over Current Protection Device). Circuit breakers are predominantly grouped based on appraised voltages. Circuit breakers beneath evaluated voltage of 1000V are known as the low voltage circuit breakers or more 1000V are known as the high voltage circuit breakers.