This article has made statistic and analyses on many types of flameproof button and switches used in coalmine, such as travel switch, limit switch, pull switch, and so on.
就煤矿井下现用的隔爆按钮以及行程开关、限位开关、打点器、拉线开关、井口开关等进行了统计、分析，针对使用中出现的问题提出了改进措施。
The inside places the switch adoption flameproof a piece, be the product open can cut off the power supply automatically.
内置开关采用防爆元件，当产品打开时能自动切断电源。
This paper introduces a new type vacuum circuit-breaker by analyzing the current mine flameproof feed switches. The advantages of it as the inner element for the flameproof feed switch are expatiated.
本文在分析国内矿用隔爆馈电开关现状的基础上介绍了一种新型真空断路器，并阐述其作为隔爆馈电开关内装元件的优越性。
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