This is important because the programmer designed the circuit self-test based on an analysis of a good circuit and what might fail within that circuit.
而且这也是非常重要的，因为程序员设计电路自检基于该电路中的分析——什么是好的电路和什么可能会导致失败。
A fail-safe backup system ensures reliable operation, even if a fault develops in the main circuit.
一个自动防故障装置的后备系统确保了可靠的运转，即时在主要电路产生了故障。
The possibility that a circuit breaker may fail to perform its function, when instructed to do so, is higher than for protection and trip circuit.
这样做以后，断路器失灵的可能性高于保护和跳闸回路失灵的可能性。
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