IP51 vs IPX7
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP51 and IPX7 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 0) and liquid protection (level 1 vs 7). IP51 is rated for dust-protected and vertically dripping water, while IPX7 provides no protection and temporary immersion (up to 1 m).
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.
IPX7 resists temporary immersion up to 1 meter for 30 minutes, with solid protection not specified. Common for portable electronics that may be dropped in water.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP51
5 — Dust-Protected
IPX7
0 — No Protection
Liquid protection (second digit)
IP51
1 — Vertically Dripping Water
IPX7
7 — Temporary Immersion (up to 1 m)
Dust-tight
IP51
Limited
IPX7
No
Water-jet resistant
IP51
No
IPX7
Yes
Submersible
IP51
No
IPX7
Yes
Outdoor suitable
IP51
No
IPX7
Yes
The exact difference (IP51 vs IPX7)
Solid protection
IP51
Level 5 — Dust-Protected
IPX7
Level 0 — No Protection
IP51 provides "Dust-Protected" (level 5), while IPX7 provides "No Protection" (level 0). IP51 is 5 levels higher.
Liquid protection
IP51
Level 1 — Vertically Dripping Water
IPX7
Level 7 — Temporary Immersion (up to 1 m)
IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water), while IPX7 handles Hydrostatic ~10 kPa at 1 m (Temporary Immersion (up to 1 m)). IPX7 provides 6 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IPX7 offers higher overall protection than IP51. Choose IPX7 for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.