DIRECT-CURRENT RELAY RESISTANT TO SHORT-CIRCUIT CURRENT

摘要

Disclosed is a direct-current relay resistant to short-circuit current, the relay comprising two stationary contact leading-out terminals (11, 12), a movable leaf spring (2) and a push rod component (3), wherein an upper magnetizer (61) is mounted above a preset position of the movable leaf spring (2), and a lower magnetizer (62) capable of moving along with the movable leaf spring (2) is mounted below the preset position of the movable spring (2); and at least one through hole (22) is provided in the movable leaf spring (2) at the preset position, such that the upper magnetizer (61) and the lower magnetizer (62) can approach each other or come into contact with each other by means of the through hole (22), and the upper magnetizer (61) and the lower magnetizer (62) form at least two independent magnetically conductive loops on the width of the movable leaf spring (2). By using magnetic pole faces added to the positions of the corresponding through holes (22) by the various magnetically conductive loops, when the movable leaf spring (2) has a large fault current, attraction in a contact pressure direction is generated to resist an electro-dynamic repulsion force generated, due to the fault current, between the movable leaf spring (2) and the stationary contact leading-out terminals (11, 12), and the present invention has the characteristics of high magnetic efficiency and low possibility of saturation of a magnetic circuit.