JPS6471026A - Switch - Google Patents

Abstract

PURPOSE:To make it possible to cut off a small current securely by arranging an arc movement space to drive the arc to contact makers, and permanent magnets at the opposite side, and presenting an outer magnetic field in only one direction in the whole movement space of the arc necessary for extinction of arc. CONSTITUTION:At the opposite side of an arc movement space A formed between insulator plates 2 opposing each other parallel to a contact maker 4, that is, at the lower side of the contact maker 4, each bar permanent magnet 18 is furnished at each position striding the contact maker 4, unifying the magnetizing direction to the arc driving direction, and the two magnets are arranged in the reverse directions each other. Since there is an outer magnetic field only in the same direction in the arc movement space A, this outer magnetic field is added effectively to the driving magnetic field generated in the arc position by the current flowing passage of the cutting current itself when the small current is cut off. Consequently, the arc is driven up to the final arc extinction position to come to extinct the arc without disturbing the drive of arc.