| 摘要 |
The contact point mechanism comprises: a pair of fixed contact-makers (13, 14), each having a fixed contact point (13a, 14a); a mobile contact-maker (15) provided with a pair of mobile contact points (15a, 15b) at two end sides in the length direction thereof, said pair of mobile contact points being capable of establishing contact with and separating from the fixed contact points (13a, 14a) of the pair of fixed contact-makers; a case (16, 17, 18) formed from an insulating material and housing the pair of fixed contact-makers and the mobile contact-maker; and arc-extinguishing permanent magnets (40 to 43) fixed to the case (16, 17, 18). The currents from the arcs (50, 51) generated between the fixed contact points and the mobile contact points and the magnetic flux from the arc-extinguishing permanent magnets (40 to 43) cause Lorentz forces (F1, F2) to be generated by the arcs (50, 51), while the pair of fixed contact-makers (13, 14) are such that the magnetic fluxes generated by the current flowing therein match the magnetic fluxes of the arc-extinguishing permanent magnets (40 to 43). |
