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Overvoltage or overcurrent sensors, such as potential transformers or current transformers, provide information about the circuit, needed to decide when to trip breakers. High-voltage and medium-voltage breakers have signals from these transformers fed to relays which are programmed to open the breaker at the proper time. The open time of the breaker is a function of the magnitude of the fault current through it. The relays are set to coordinate with the relays of either the upstream or downstream breakers, so that power is removed from the faulted or overload parts of the circuit.

The arc continues to burn until the current reaches a ‘‘natural’’ current zero upon which the arc plasma is quickly deionized by the cooling effects. Hydrogen has excellent heat capacity and dielectric properties, which provide rapid cooling to the arc and excellent dielectric recovery of the interelectrode region. Subsequently, the breaker can withstand the high transient recovery voltage following the current interruption. , 72 kV) have two interrupters connected in series by a cross-bar per phase.

Industrial three-phase, low-voltage (240 V to 1000 kV) circuit breakers used in industrial, distribution, and transmission applications. These can be either moldedcase circuit breakers or power breakers. • Industrial, three-phase, medium-voltage (5 kV to 38 kV) circuit breakers used in factories and office buildings. These are indoor metal-clad breakers. • Local power utility company for supplying power to factories, office buildings and residential homes uses distribution, three-phase, high-voltage (5 kV to 38 kV) circuit breakers.

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