失灵1位■t1φA3相:这个定值选择代表被保护断路器早期型号的辅助开关触点(52/a)的灵活逻辑操作数。当使用单相断路器失灵方案时，这个操作数代表断路器早期型号的A相辅助开关触点。这通常是一一个单一的A式触点。这个触点甚至可以调节为可能的最短动作时间。
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