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Homes less than 10 years old will have a modern type breaker box. As far as cost goes, that is a good thing if an upgrade becomes necessary. In this type of house, the breaker box will be a minimum of 100 amps, and probably have enough available open circuits to allow upgrading without needing an entirely new panel. This type of upgrade can usually be completed between $363 and $1004.
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.Its basic function is to detect a fault condition and interrupt current flow.he circuit breaker must detect a fault condition; in low voltage circuit breakers this is usually done within the breaker enclosure. Circuit breakers for large currents or high voltages are usually arranged with protective relay pilot devices to sense a fault condition and to operate the trip opening mechanism.