Circuit breaker having hybrid arc extinguishing function

A circuit breaker having a hybrid arc-extinguishing function comprises:

• an upper shell;
• a lower shell coupled to the upper shell to form an extinguishing chamber (S) filled with an insulation gas;
• a movable electrode movably installed at the upper shell, and having a movable arc contactor and a movable main contactor so that a conductive current can be divided to be shared in a certain ratio and flow through the movable arc contactor and the movable main contactor, wherein the movable electrode comprises a movable electrode body slidably inserted in a vertical direction into the upper shell, a movable arc contactor member coupled to the lower end of the movable electrode body and contacted with the fixed arc contactor member to form a conduction path, and a stopper extended outwardly from one side of the movable electrode body to restrict a vertical stroke of the movable body and having a movable main contactor with the fixed main contactor to serve as a conduction path at a lower face;
• a fixed electrode fixed at the lower shell and positioned at a coaxial line with the movable electrode, and having a fixed arc contactor contacted with the movable arc contactor for forming a conduction path and a fixed main contactor contacted with the movable main contactor for forming a conduction path, the movable main contactor being movable to a position where it is contacted with the fixed main contactor and to a position where it is separated from the fixed main contactor, and the movable arc contactor being movable to a position where it is contacted with the fixed arc contactor and to a position where it is separated from the fixed arc contactor;
• and
• a magnetic coil inserted in the extinguishing chamber (S) to form a magnetic field for rotation of an arc, and receiving the part of the conductive current from the movable electrode shared with the fixed arc contactor.

A circuit breaker having a hybrid arc-extinguishing function comprises:

• an upper shell;
• a lower shell coupled to the upper shell to from an extinguishing chamber (S) filled with a insulation gas;
• a movable electrode movably disposed at the upper shell and having a movable arc contactor and a movable main contactor so that a conductive current can be divided in a certain ratio and flow through the movable arc contactor and the movable main contactor;
• a fixed electrode fixed at the lower shell and positioned at a coaxial line with the movable electrode, and having a fixed arc contactor contacted with the movable arc contactor to form a conduction path and a fixed main contactor contacted with the movable main contactor to form a conduction path, the movable main contactor being movable to a position where it is contacted with the fixed main contactor and to a position where it is separated from the fixed main contactor, and the movable arc contactor being movable to a position where it is contacted with the fixed arc contactor and to a position where it is separated from the fixed arc contactor;
• a magnetic coil inserted in the extinguishing chamber (S) to form a magnetic filed for a rotation of an arc, and receiving the conductive current from the movable electrode shared with the fixed arc contactor;
• and
• a cylindrical magnetic chamber with a varying inner diameter being disposed at the inner circumferential surface of the fixed electrode to align the arc to the central portion of the fixed electrode and quickly extinguish the arc in arc extinguishing, wherein the cylindrical magnetic chamber has a hollow cylinder form which is inserted into an exhaust channel of the fixed electrode to discharge the gas of the extinguishing chamber outwardly, and includes an arc aligning portion with an upper inner circumferential surface formed to be slanted at a predetermined angle toward a center of an inner diameter to converge the arc.