失靈1位■t1φA3相:這個(gè)定值選擇代表被保護(hù)斷路器早期型號(hào)的輔助開關(guān)觸點(diǎn)(52/a)的靈活邏輯操作數(shù)。當(dāng)使用單相斷路器失靈方案時(shí)，這個(gè)操作數(shù)代表斷路器早期型號(hào)的A相輔助開關(guān)觸點(diǎn)。這通常是一一個(gè)單一的A式觸點(diǎn)。這個(gè)觸點(diǎn)甚至可以調(diào)節(jié)為可能的最短動(dòng)作時(shí)間。

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