Easy to manufacture, but can only maintain the arc as a diffusion type when the current is not large; By the 1960s, the cup-shaped contact with transverse magnetic field was widely used. The characteristic of the longitudinal magnetic field contact was that the longitudinal magnetic field effectively suppressed the arc The movement of the arc column reduces the radial ion and electron losses, improves the breaking capacity of the vacuum circuit breaker , and maintains the vacuum arc as a diffusing type at high currents. Shielding materials are generally made of copper or stainless steel, and sometimes also made of copper-chromium alloy. Bellows general welding <br> vacuum interrupter chamber in the mouth and moving the outer cover plate of the movable conductive rod, acts as a seal, since the high voltage vacuum switch constantly opening or closing operation, the vacuum interrupter chamber The bellows are also being constantly compressed or restored, so easy to wear and tear, so the bellows can directly determine the mechanical life of the interrupter.
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