This pressure switch connected to a pneumatic or hydraulic system is used to switch on/off, or to switch electrical circuits through a manometric element that controls a quick-break switch. As a working media, it can be used with all kinds of aeronautical fuels and oils and other fluids, which are not more corrosive than water, and all gases that are not more corrosive than air (e.g. nitrogen). These pressure switches are divided into two groups according to the case design and into a few subgroups by operation range, adjustment tolerance, difference and maximum pressure. The operating pressure is between 0.01 and 29.0 MPa. This product can be fully customized.