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Vacuum circuit breaker

Circuit breakers provide protection for electrical systems from electrical fault conditions such as current overloads, short circuits, and low level voltage conditions. The vacuum circuit breaker is one of the breaker by which the circuit can be broken rapidly by extinguishing an arc in a vacuum chamber when the circuit is opened/closed and when the circuit is broken by a generation of the accident current. Vacuum circuit breakers are used for protecting circuits and appliances by rapidly breaking circuits simultaneously with quick extinguishing arc, which is generated during an opening/closing operation of such vacuum circuit breakers under a normal load state or when shutting off fault current, in a vacuum container. A vacuum circuit breaker incorporates an apparatus for connecting or disconnecting a power source to an electrical load in a high voltage distributing power line through which there flows a high voltage current in thousands of volts and hundreds of amperes. Inside of the circuit breaker is vacuum or is filled with an insulating material, and an arc-extinguishing unit for shielding arc generated in the switching operation of a fixed contactor and a movable contactor installed in the vacuum area or insulating material filled area is disposed in the circuit breaker. In order to effectively shield an arc which occurs during a switching operation, the vacuum circuit breaker is provided with a vacuum chamber having a switching mechanism therein. The switching mechanism for providing driving force is connected to an extended end of the movable contactor exposed-installed from the sealed area in order to contact or separate the movable contactor to/from the fixed contactor. Vacuum circuit breakers each contain an electrode structure composed of a pair of a fixed electrode and a movable electrode. The fixed and movable electrodes each comprise an arc electrode, an arc electrode support member for supporting the arc electrode, a coil electrode contiguous to the arc electrode support member, and an electrode rod provided at an end portion of the coil electrode. A vacuum circuit-breaker for a large current is constructed so that a pair of separable electrodes are disposed in a vacuum vessel, and rods connected to the rear surfaces of these electrodes extend to the outside of the vacuum vessel. Each pair of the above electrodes is composed of an are electrode portion on the front surface side and a coil electrode portion on the rear surface side which are opposed to each other.

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