| 摘要 |
A medium voltage circuit breaker, including first and second arcing contacts, the first arcing contact being longitudinally slidable with respect to the second arcing contact between open and closed positions, first and second main contact, the first main contact being movable with respect to the second main contact between open and closed positions, a sealed enclosure filled with a high dielectric strength gas and housing the first and second arcing and main contacts, and operating mechanism for closing the first and second arcing contacts before the first and second main contacts close and for opening the first and second arcing contacts after the first and second main contacts open. The operating mechanism is mechanically coupled to the first arcing and the first main contacts and comprises a compressible linkage coupled to the first arcing contact. The compressible linkage is compressible a predetermined distance against an urging force provided by a spring as the first and second arcing contacts close, thereby compressing the spring. The operating mechanism is adapted to reduce compression of the spring and reduce a contact force between the first and second arcing contacts after the main contacts have closed.
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