IP51 vs IP6X
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP51 and IP6X are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 6) and liquid protection (level 1 vs 0). IP51 is rated for dust-protected and vertically dripping water, while IP6X provides dust-tight and no protection.
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.
IP6X is fully dust-tight—no ingress of dust whatsoever—with water protection not specified. The highest solid-protection rating, used where complete dust exclusion is critical.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP51
5 — Dust-Protected
IP6X
6 — Dust-Tight
Liquid protection (second digit)
IP51
1 — Vertically Dripping Water
IP6X
0 — No Protection
Dust-tight
IP51
Limited
IP6X
Yes
Water-jet resistant
IP51
No
IP6X
No
Submersible
IP51
No
IP6X
No
Outdoor suitable
IP51
No
IP6X
No
The exact difference (IP51 vs IP6X)
Solid protection
IP51
Level 5 — Dust-Protected
IP6X
Level 6 — Dust-Tight
IP51 provides "Dust-Protected" (level 5), while IP6X provides "Dust-Tight" (level 6). IP6X is 1 level higher.
Liquid protection
IP51
Level 1 — Vertically Dripping Water
IP6X
Level 0 — No Protection
IP51 provides "Vertically Dripping Water" (level 1), while IP6X provides "No Protection" (level 0). IP51 is 1 level higher.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP51 and IP6X offer comparable overall protection; choose based on the specific protection dimension (dust vs. water) that matters most for your application.