IP11 vs IP55
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP11 and IP55 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 1 vs 5) and liquid protection (level 1 vs 5). IP11 is rated for > 50 mm — back of hand and vertically dripping water, while IP55 provides dust-protected and water jets (6.3 mm nozzle).
Engineered to deliver protection against solid objects larger than 50 mm and protection against vertically falling drops of water. Dripping water shall have no harmful effects.. Classified as IEC 60529 ingress protection code IP11, it pairs solid level 1 with liquid level 1.
IP55 is dust-protected and resists low-pressure water jets (6.3 mm nozzle, 30 kPa). A popular industrial rating for equipment exposed to dust and directed water spray but not immersion.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP11
1 — > 50 mm — Back of Hand
IP55
5 — Dust-Protected
Liquid protection (second digit)
IP11
1 — Vertically Dripping Water
IP55
5 — Water Jets (6.3 mm nozzle)
Dust-tight
IP11
No
IP55
Limited
Water-jet resistant
IP11
No
IP55
Yes
Submersible
IP11
No
IP55
No
Outdoor suitable
IP11
No
IP55
Yes
The exact difference (IP11 vs IP55)
Solid protection
IP11
Level 1 — > 50 mm — Back of Hand
IP55
Level 5 — Dust-Protected
IP11 provides "> 50 mm — Back of Hand" (level 1), while IP55 provides "Dust-Protected" (level 5). IP55 is 4 levels higher.
Liquid protection
IP11
Level 1 — Vertically Dripping Water
IP55
Level 5 — Water Jets (6.3 mm nozzle)
IP11 handles 0.1 mm/min drip rate (Vertically Dripping Water), while IP55 handles 30 kPa (Water Jets (6.3 mm nozzle)). IP55 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP55 offers higher overall protection than IP11. Choose IP55 for harsher environments; IP11 may suffice for milder conditions and can be more cost-effective.