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八零年老菜鳥(niǎo)
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樓主  發(fā)表于: 2014-04-01 13:17
各位師傅，請教一下什么情況下該選擇四級斷路器呢？一般看到柜子內都是三級斷路器或者空開(kāi)，什么情況下該選擇四級開(kāi)關(guān)呢？謝謝解答
風(fēng)輕云淡平和心態(tài)
yamqq
雅馬哈，愛(ài)普生，電裝機器人。
級別: 網(wǎng)絡(luò )英雄

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1樓  發(fā)表于: 2014-04-01 16:44
嚴格的說(shuō)，只能在雙電源切換的情況下才能用四極開(kāi)關(guān)！
這個(gè)人很懶，什么也沒(méi)有留下！

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