最大电流恒定及截止式电路保护装置，免除故障手机线路板进一步损坏。
Protection devices of maximum current steady and cut-off electric circuit avoid further damage of failure phone circuit board.
继电器是保护系统的逻辑元件，它感知故障，并使断路器解扣电路带电和断路器打开触点。
Relays are the logic elements of a protection system which sense the fault and cause the circuit-breaker trip circuits to be energized and the breakers to open their contacts.
任何忽视电路保护设计的电气或电子产品都埋藏了故障隐患。
Any ignore that the electric or electronic product that the circuit protection designs has all hidden malfunction hidden trouble.
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