The INFICON VSA100A pressure switch is used as a safety switch in vacuum systems, for example, to automatically cut off the gas supply when venting vacuum systems with a purge gas pressure of 6 mbar below atmospheric pressure.

At a differential pressure of 6 mbar or a reset pressure of 3 mbar below atmospheric pressure, an elastic diaphragm activates a changeover contact, which can then be used to directly control auxiliary devices.