能接通、承载和分断正常电路条件下的电流，也能在规定的非正常条件（例如短路条件）下接通、承载一定时间和分断电流的一种机械开关电器。
Mechanical switching device capable of making, carrying and breaking currents in normal circuit conditions and, when specified, in given operating overload conditions.
除湿机这种采用双位的电器机械开关，不易损坏， 使用寿命长。
The dehumidifier for which the dual-site electric apparatus mechanical switch is adopted is uneasy to be damaged and has long service life.
图4-9中使用的机械式继电器，可以用电子开关来代替。
The mechanical relays, which have been assumed in Fig. 4-9, can be replaced by electronic switches.
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