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Vacuum switches are typically found in pneumatic systems, where they are used to regulate the flow of pressure or a vacuum between areas. In this way, vacuum switches have an important part to play in maintaining the stability of a system, as well as ensuring that optimal conditions are upheld. With a variety of applications, including as part of safety interlocks, vacuum switches can be either mechanical or digital. The digital version is ideal for use with systems involving pressurised fluids, and are commonly found in mobile industrial machinery, where they act as a safety device that alerts users should the oil pressure spike or drop beyond set parameters.