Contemporary MCCB(Molded case Circuit Breaker)and their adoptive techniques

摘要

Due to the great increase of short circuit current in recent years the molded case circuit breaker (MCCB) is facing to improve its rated short circuit breaking capacity. In last twenty years a series of new technologies have been developed, such as installing parallel conductor, using high property alloy of silver contact, series connection with limit current resistance, using high quality plastic to make case and insulation components, using VJC(Vapour Jet Control) technique to enhance the arc extinguish and so on. Some of the new technologies are reviewed in the paper.