IP51 vs IP53
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP51 and IP53 are both IEC 60529 ingress protection codes, but they differ in liquid protection (level 1 vs 3). IP51 is rated for dust-protected and vertically dripping water, while IP53 provides dust-protected and spraying water (up to 60°).
With IP51, an enclosure receives dust-protected (limited ingress, no harmful deposit) and protection against vertically falling drops of water. Dripping water shall have no harmful effects.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 5 with second-digit (liquid) level 1.
Built to withstand dust-protected (limited ingress, no harmful deposit) and protection against spraying water. Water sprayed at an angle up to 60° on either side of the vertical shall have no harmful effects.. Classified as IEC 60529 ingress protection code IP53, it pairs solid level 5 with liquid level 3.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP51
5 — Dust-Protected
IP53
5 — Dust-Protected
Liquid protection (second digit)
IP51
1 — Vertically Dripping Water
IP53
3 — Spraying Water (up to 60°)
Dust-tight
IP51
Limited
IP53
Limited
Water-jet resistant
IP51
No
IP53
No
Submersible
IP51
No
IP53
No
Outdoor suitable
IP51
No
IP53
No
The exact difference (IP51 vs IP53)
Solid protection
IP51
Level 5 — Dust-Protected
IP53
Level 5 — Dust-Protected
Both IP51 and IP53 share the same solid protection: Dust-Protected.
Liquid protection
IP51
Level 1 — Vertically Dripping Water
IP53
Level 3 — Spraying Water (up to 60°)
IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water), while IP53 handles 80 kPa (tube) / 50 kPa (nozzle) (Spraying Water (up to 60°)). IP53 provides 2 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP53 offers higher overall protection than IP51. Choose IP53 for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.