The core of electric power circuit probably is big power switch unit, and it's most important that it runs stably and safely.

电力电子线路的核心多为大功率开关器件，其稳定安全运行至关重要。

youdao

The vacuum load switch unit is fixedly sealed and isolated by adopting epoxy resin.

真空负荷开关单元采用环氧树脂固封绝缘。

youdao

The antenna switch unit is selectively coupled to the first antenna or the second antenna.

天线切换单元选择性地耦接于第一天线或第二 天线。

youdao

There is no need to use the push button on the side of the PTV3000 unit to switch between Widi and Miracast modes.

ENGADGET: Netgear PTV3000 updated, supports Miracast-ready Android devices

In order to fully exploit the sound potential of the HDVD 800 with any audio source, a rotary gain switch at the rear of the unit provides simple adaptation of the amplifier output to the audio input voltage.

ENGADGET: Sennheiser unveils HDVA 600 analog headphone amp, asks for $1,600

Running an AC unit without a low-pressure cutoff switch when it's colder than about 60 degrees might damage it, says Troy Gregory, president of Standard Heating and Air Conditioning.

WSJ: Don't Wait to Service AC Units