IP51 vs IPX6
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP51 and IPX6 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 0) and liquid protection (level 1 vs 6). IP51 is rated for dust-protected and vertically dripping water, while IPX6 provides no protection and powerful water jets (12.5 mm nozzle).
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.
IPX6 resists powerful water jets (12.5 mm nozzle, 100 kPa) with solid protection not specified. Suitable for heavy-rain or hose-exposed equipment where dust sealing is not required.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP51
5 — Dust-Protected
IPX6
0 — No Protection
Liquid protection (second digit)
IP51
1 — Vertically Dripping Water
IPX6
6 — Powerful Water Jets (12.5 mm nozzle)
Dust-tight
IP51
Limited
IPX6
No
Water-jet resistant
IP51
No
IPX6
Yes
Submersible
IP51
No
IPX6
No
Outdoor suitable
IP51
No
IPX6
Yes
The exact difference (IP51 vs IPX6)
Solid protection
IP51
Level 5 — Dust-Protected
IPX6
Level 0 — No Protection
IP51 provides "Dust-Protected" (level 5), while IPX6 provides "No Protection" (level 0). IP51 is 5 levels higher.
Liquid protection
IP51
Level 1 — Vertically Dripping Water
IPX6
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water), while IPX6 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)). IPX6 provides 5 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP51 and IPX6 offer comparable overall protection; choose based on the specific protection dimension (dust vs. water) that matters most for your application.