| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-reliability D.C. relay capable of cutting off a D.C. high voltage in a short time by a small and simple structure. SOLUTION: This D.C. relay is so structured that a moving contact 3 of a switch 10 is brought into contact with and separated from fixed contacts 21 and 22 by moving forward and backward a moving iron core 54 of a solenoid 50. At least one pair of intermediate fixed contacts 23a and 23b are formed between both the fixed contacts; the respective moving contacts 3 are arranged and connected so that the fixed contacts are serially connected in coming into contact with the respective fixed contacts 2. When a cutoff high voltage is divided by dividing each contact like that, the size of an arc between the contacts is reduced, the arc can be extinguished in a short time, and damage to the contact caused by an arc current is restrained. A request for various kinds of sizes is met by separating the switch 10 from the solenoid 50 and by selecting the size of one of them with respect to the other. The contacting/separating action of the contact is stabilized by screwing both its casings 1 and 51 in the contacting and separating direction, and by restraining a length variation in the forward and backward movement direction of the solenoid as much as possible. COPYRIGHT: (C)2005,JPO&NCIPI
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