The paper introduced the effect of neutral wire the harm of open circuit and a kind of simple credible open circuit protection method.
介绍了在三相四线制供电系统中，中线的作用，断线的危害，以及一种简单可靠的断线保护电路。
The chip has internal short circuit protection, open circuit protection, lightning strike protection and thermal shutdown protection circuits.
芯片内设的短路保护、开路保护、雷击保护、过温保护等电路可保证收发器在恶劣的应用环境下正常工作。
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.
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。
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