用环氧和有机硅树脂涂料对由聚乙烯／炭黑（PE／CB）制备的正温度系数（PTC）电路保护元件的表面处理及其工艺进行了研究。

The packaging materials and processes of positive temperature coefficient (PTC) devices made up of the composite of polyethylene and carbon black(PE/CB) for over current protection were studied.

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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.

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另一个关注焦点为专门设计用于保护电路的元件，使其不受电流和电压冲击、ESD和非正常范围温度影响。

A further focus is on components that are designed to protect circuits from current and voltage surges, ESD and excessive temperatures.

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