| The first digit | Importance for device protection against the ingress of foreign bodies | The second digit | Importance for device protection against the ingress of water and its harmful effects |
| 0 | without protection | 0 | without protection |
| 1 | diameter 50 mm | 1 | dripping |
| 2 | diameter 12,5 mm | 2 | dripping (with 15 ° deflection) |
| 3 | diameter 2,5 mm | 3 | sprayed |
| 4 | diameter 1,0 mm | 4 | pulverized |
| 5 | protection against dust | 5 | cast stream |
| 6 | dustproof | 6 | lcast a strong stream |
| 7 | brief immersion | ||
| 8 | continuous immersion |
