IP65 vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP65 and IP51 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 5) and liquid protection (level 5 vs 1). IP65 is rated for dust-tight and water jets (6.3 mm nozzle), while IP51 provides dust-protected and vertically dripping water.
IP65 is dust-tight and resists low-pressure water jets (6.3 mm nozzle, 30 kPa). It is the most common standard for fully exposed outdoor electronics such as lighting, cameras, and EV chargers.
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.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP65
6 — Dust-Tight
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP65
5 — Water Jets (6.3 mm nozzle)
IP51
1 — Vertically Dripping Water
Dust-tight
IP65
Yes
IP51
Limited
Water-jet resistant
IP65
Yes
IP51
No
Submersible
IP65
No
IP51
No
Outdoor suitable
IP65
Yes
IP51
No
The exact difference (IP65 vs IP51)
Solid protection
IP65
Level 6 — Dust-Tight
IP51
Level 5 — Dust-Protected
IP65 provides "Dust-Tight" (level 6), while IP51 provides "Dust-Protected" (level 5). IP65 is 1 level higher.
Liquid protection
IP65
Level 5 — Water Jets (6.3 mm nozzle)
IP51
Level 1 — Vertically Dripping Water
IP65 handles 30 kPa (Water Jets (6.3 mm nozzle)), while IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP65 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP65 offers higher overall protection than IP51. Choose IP65 for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.