塑壳断路器触头故障分析与优化设计

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关键词：塑壳断路器；有限元分析；电动力；电动斥力；触头中图分类号：TM561 文献标志码：A文章编号：2095-8188（2025）07-0044-05DOI： 10.16628/j .cnki.2095-8188.2025.07.007

Abstract：A short-circuit overload test under an effctivecurrentof8OOOA is conductedonacertain doublebreak moulded case circuit breaker（MCCB），and the contact ablation fault that occurred is analyzed.First，a theoreticalcalculationofthe electric force isperformed.Then，using Maxwell3Dfinite elementanalysis software combined with theHolm forcecalculation formula，theelectricrepulsionofthedouble-break MCCB iscalculated. The trends of the two calculation resultsare consistent，and the cause of contact ablation is determined through comparison.The error between the simulation calculation result and the measured value of contact pressure does not exceed 8% ，and the used calculation method can provideareference for the design and optimizationof the MCCB contact system.

Key words：molded case circuit breaker （MCCB）； finite element analysis；electrodynamic force;electromagneticrepulsion force；contact

0 引言

塑壳断路器（MCCB）作为众多低压电器中的一种，是既能接通、承载及分断正常电路条件下的电流，又能在规定的非正常电路（如短路）下接通、承载一定时间和分断电流的一种机械开关电器[1]。（剩余4860字）