Designated with IP (international protection) and a 2-digit number according to DIN 40050
- 1st digit
Degree of protection against penetration by solid bodies:
0 no special protection provided
1 solid bodies of > 50 mm; no protection against intentional access
2 solid bodies of > 12 mm; fingers, etc. cannot be inserted
3 solid bodies of > 2.5 mm; tools, wires, etc. (thickness > 2.5 mm) cannot be inserted
4 solid bodies of > 1 mm; tools, wires, etc. (thickness > 1 mm) cannot be inserted
5 dust in harmful quantities; complete protection against contact
6 dust (dustproof); complete protection against contact - 2nd digit
Degree of protection penetration by water
0 no special protection provided
1 water dripping vertically
2 water dripping up to 15° from the vertical
3 water dripping up to 60° from the vertical (spray)
4 water from all directions (splashing)
5 water jet projected from a nozzle, from all directions (jet spray)
6 heavy seas or powerful water jet (flooding)
7 immersion in water under a defined pressure and period of time (immersion)
8 submersion in water indefinitely. Conditions to be described by the manufacturer (submersion) (water shall not penetrate unit in critical amounts under conditions 1-8)
Example: IP54 A unit with this designation is protected against the penetration of dust in harmful quantities and against splashing water