| 摘要 |
PCT No. PCT/GB89/00387 Sec. 371 Date Dec. 13, 1990 Sec. 102(e) Date Dec. 13, 1990 PCT Filed Apr. 12, 1989 PCT Pub. No. WO89/09998 PCT Pub. Date Oct. 19, 1989.An electrical switch for switching large currents in a low voltage circuit consists of two opposing terminals (32) connected to conducting rails (20) of an electromagnetic projectile launcher (10), each terminal having two conducting arms (32A, 32B) which enclose the breech chamber (114) of the launcher. Conducting contacts (66A, 66B) bridging across the opposing arms of the terminals are rapidly lifted to open the switch when the contacts are exposed to propellant gas pressure exerted on a projectile armature (22) slideable within the chamber. Electromagnetic forces of repulsion, which act upon whichever contact is the latter of the two to lift off the terminals, assist simultaneity of current pathway severance across both arms, thereby suppressing arcing at switch opening.
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