The defects in manufacture and installation of GIS would cause some trouble in its operation. There are new characteristics as to the trouble shooting rather than the open switch devices.

由于制造和安装中的缺陷，常在GIS投运后发生故障，其故障处理比敞开式开关设备有新特点。

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Limit switch, directly actuated, spring returned, normally open. Switch can be specified as open or closed.

限制开关，直接启动，弹簧复位，正常情况下为断路。可指定开关为断开或接通。

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Rip open a Cisco switch, an Apple iPod, an Xbox 360 or any big corporate disk drive and you'll find a Marvell chip inside.

FORBES: Magazine Article

During Sunday's game, the relay device triggered, signaling a switch to open when it shouldn't have, causing the partial outage.

WSJ: Super Bowl Outage Traced to Faulty Entergy Gear

Some researchers, including Nancy Kedersha, a biologist at ImmunoGen (a biotechnology company in Cambridge, Massachusetts) who was one of the discoverers of vaults, think they regularly switch from open (ie, flowers) to closed (ie, barrels).

ECONOMIST: Cell biology: The secret of the vaults | The