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C

Circuit breaker

is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.

Cosφ

the ratio between Active Power and Apparent Power in volts-amperes is called power factor PF.

Current

is the rate at which electrons flow past a point in a complete electrical circuit. At its most basic, current = flow. An ampere, or amp, is the international unit used for measuring current.