Open circuits are more likely to occur at the connector ends.

电路开路更可能发生在连接器端。

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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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Some areas covered include developing an understanding of simple, open, and closed circuits and learning how different mechanical systems work.

一些简单的开、闭合电路，可以让孩子们掌握机械系统的工作原理。

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Spintronics is an emerging field of chip design in which circuits open and close according to the spin of electrons rather than their location.

FORBES: Magazine Article

He was the author of a number of discoveries relating to the telegraph industry, including a self-adjusting relay that solved the problem of circuits sticking open or shut, and a telegraph printer a precursor of what was later called the Teletype machine.

NEWYORKER: In the Air