Pressure Switch is a device designed to give an output in response to a set level of pressure. The switch makes electrical feedback on the rise or fall of pressure. The automated response of the switch is based on pressure. Its application ranges from industries to even residences and offices. It is a mechanical or electronic device activated by the pressure of fluids, air, or gas when the fluids, air, or gasses reach a threshold or setpoint. Pressure Switch is very useful.