Differential pressure switch for monitoring overpressure, differential pressure, or underpressure of air and non-flammable, non-aggressive gases. Usable as an exhaust or fan monitoring device or flow switch to secure electric heating registers, as a filter monitor, air pressure deficiency safeguard, or limit controller. Note: Once the differential pressure switch has switched a voltage of 24 and a current of 0.1, the gold layer on the contacts has burned off. After that, the differential pressure switch can only be operated with this or a higher power. Note: The hose set JZ-06 1 is not included in the delivery and must be ordered separately. Delivery includes the mounted mounting bracket JZ-10. JDL-111.