28405.0-00 Enclosure Pressure Compensation Device M40

• UL Type 1, 4, 4X & IP 66 protection
• Semipermeable membrane
• Easy to install
• Two sizes - M40 & M12

Pressure differentials in a hermetically sealed enclosure are a result of the heat generated by electrical and electronic components in the enclosure, as well as the fluctuation of the outside temperature. In the case of negative pressure or vacuum, for example, dust and humidity can be absorbed through the door seal and can enter the enclosure.
The DA 284 Vent Plug provides a protected enclosure environment for valuable and crucial components with a UL 4X rated degree of protection. A semipermeable membrane inside the device allows air and humidity to leave the enclosure. In the opposite direction, it only allows dry air into the enclosure while not allowing humidity and dust from the outside to enter.

Installation
Make cut-out in enclosure wall of 1.6 inches (40.5+0.5mm) for size M40 or 0.5 inches (12.5+0.5mm) for size M12, and mount vent plug with nut. Make sure that the sealing gasket is placed on the outer side of the enclosure. For optimal pressure compensation, it is recommended to use two devices on opposite sides towards the top of the enclosure.

¹) at a pressure difference of min. 70mbar