The prolongation of successful on-load cycle operation of low-voltage switchgear is important for the development of new products that meet global standards and are environmentally safe. Research related to longevity prolongation has focused mainly on analysis of circuitbreaking phenomena. Fuji Electric has achieved good results by evaluating and analyzing the phenomena associated with both circuit-making and circuit-breaking operations. This paper describes technology for reducing contact bounce time, material for achieving high-performance contacts, and a method for electrically estimating the longevity of successful on-load cycle operation as examples of efforts to establish essential technology. An overview of recent equipment for electrically evaluating longevity is also presented.
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