The MADAS MW50-A4 is a high-precision mechanical gas and air pressure switch manufactured by MADAS (Italy). Designed in strict accordance with the EU EN1854 gas equipment safety standard, it is specially developed for pressure monitoring and safety interlock protection in low-pressure gas working conditions. Adopting a diaphragm sensing structure, the device features a widely adjustable pressure range of 2.5~50mbar, which can accurately monitor the pressure changes of media such as natural gas, liquefied petroleum gas and clean air, and realize automatic signal switching for overpressure and underpressure faults. With a compact structure, convenient commissioning, stable operation and strong anti-interference performance, it is suitable for industrial thermal systems such as boilers, burners, hot blast stoves, sterilizers and drying equipment. Widely used in food and beverage, HVAC, light industry manufacturing and other fields, it is an essential core safety protection component for gas combustion systems. It effectively avoids potential safety hazards such as flameout, backfire and incomplete combustion caused by abnormal air pressure, ensuring stable, compliant and safe operation of equipment.