SACE - EMAX2 | Ás vezes a evolução dá um salto (EN)

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SACE - EMAX2 | Ás vezes a evolução dá um salto (EN)

Publicado: 9 de dezembro de 2014 · Categoria: Cadernos técnicos

Deste documento

SACE low voltage air circuit-breakers Sometimes evolution takes a leap. Origins and evolution of low voltage air circuit-breakers Air circuit-breakers are circuit-breakers of significant dimensions, characterized by rated currents, short-time currents and high breaking capacities, which are used primarily in industrial applications. They can be utilized both as circuitbreakers for general protection of installations and as circuit-breakers for protection of electric machines (generators, motors, transformers and capacitors). . Although used primarily for industrial applications, they can also be used for low-voltage primary and secondary distribution in all high-power installations: civil, industrial and tertiary sector, and on board ships, in mines and power stations. The modern versions of the first air circuit-breakers have their origins in the period of post-war reconstruction when deionization chambers were invented. The history of SACE air circuit-breakers began at the end of the forties in 1949 to be precise with the designing of the DM series. The introduction of deionization chambers is fundamental because these devices, which facilitated the extinguishing of the electric arc, resolved one of the most important problems concerning the interruption of high current values. When the contacts of a circuit-breaker under load are opened, the surrounding air which is normally insulating heats up and ionizes, becoming a conductor. This phenomenon prevents interruption of the...