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The phrase "a key device is" is correct and usable in written English.
It can be used when introducing an important element or tool that plays a significant role in a discussion or analysis.
Example: "In the context of this experiment, a key device is the spectrometer, which allows for precise measurements of light wavelengths."
Alternatives: "an essential tool is" or "a crucial element is".
Exact(1)
There are also power strips that shut off when a key device is turned off, so that if you turn off your TV, the strip also cuts power to your cable box, gaming console and DVD player.
Similar(59)
The key devices were the transparent tubes (inner diameter 2.5 cm, length 20.5 cm, effective volume 100 mL).
Consider purchasing a hide-a-key device, which is a small box with a powerful magnet that attaches to the bottom on your vehicle frame.
A key device in the movie is that the replicants do not have a normal emotional range, something that can be detected using a "Voight-Kampff" test to measure empathic responses.
Metaphor is a key device for suggesting worth (a reciter might call himself a ferocious animal), and poetic license is granted for coining new words.
All of which is to say that the V20, announced today during an evening press conference, is a key device for the company.
In petroleum refining industry, external catalyst cooler is a key device in FCC units processing heavy residue feedstock.
The residential gateway is a key device in the provision of Internet access to a household or to a small office.
High pressure reducing valve (HPRV) is a key device for the pressure control of high temperature and pressure steam in industrial processes.
To operate long plasma discharge in WEST, infrared thermography is a key device, which enables a safe operation by means of a real time surface temperature monitoring, while providing essential data for various physics studies.
In mammals, thermostat is a key device to maintain body temperature against changes in ambient temperatures.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com