This paper introduces the principle and present situation of non-liner resistor of MCB(main circuit breaker),ad-vances the im proving assumptions from material and manufacture technologies,and analyzes the advantages of this improvement.

• 介绍了主断路器非线性电阻的作用原理及运用现状,从选材和制造工艺等方面对非线性电阻的改进提出了设想,并分析了其优越性。