失靈1位■t1φA3相:這個定值選擇代表被保護斷路器早期型號的輔助開關觸點(52/a)的靈活邏輯操作數(shù)。當使用單相斷路器失靈方案時，這個操作數(shù)代表斷路器早期型號的A相輔助開關觸點。這通常是一一個單一的A式觸點。這個觸點甚至可以調節(jié)為可能的最短動作時間。

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