IP40 is an IEC 60529 ingress-protection rating, and its two digits describe two separate things. The first digit, 4, means the enclosure protects against solid foreign objects 1 mm in diameter and larger, including most wires, screws, and small tools, though it is not rated as fully dust-tight. The second digit, 0, means there is no protection against water of any kind.
In practice, IP40 LoRaWAN devices are built for clean, dry indoor settings. They suit:
- Offices, homes, and other conditioned indoor spaces
- Indoor sensing such as occupancy, air quality, or asset tracking
- Mounting inside larger equipment enclosures
They are not appropriate for outdoor use, dusty areas, or anywhere exposed to rain, splashing, condensation, or washdown.
Enclosure rating matters when selecting a device because it sets the operating limits. Choosing an IP40 unit for the wrong environment risks moisture or particle ingress and early failure, so match the rating to where the sensor will live.
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Frequently asked questions
Is IP40 waterproof?
No. The second digit of IP40 is 0, meaning the enclosure offers no protection against water. Keep IP40 devices away from rain, splashes, condensation, and washdown.
What does the 4 in IP40 protect against?
The first digit, 4, means the enclosure blocks solid foreign objects 1 mm in diameter or larger, such as most wires, screws, and small tools. It does not certify full dust-tightness.
Where should I use an IP40 device?
IP40 suits clean, dry, indoor environments like offices, living spaces, and equipment cabinets where there is no exposure to water or heavy dust.