IP25 vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP25 and IP51 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 2 vs 5) and liquid protection (level 5 vs 1). IP25 is rated for > 12.5 mm — finger and water jets (6.3 mm nozzle), while IP51 provides dust-protected and vertically dripping water.
IP25 is an ingress protection code that ensures protection against solid objects larger than 12.5 mm and protection against water jets. Water projected by a 6.3 mm nozzle against the enclosure from any direction shall have no harmful effects.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 2 with second-digit (liquid) level 5.
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)
IP25
2 — > 12.5 mm — Finger
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP25
5 — Water Jets (6.3 mm nozzle)
IP51
1 — Vertically Dripping Water
Dust-tight
IP25
No
IP51
Limited
Water-jet resistant
IP25
Yes
IP51
No
Submersible
IP25
No
IP51
No
Outdoor suitable
IP25
Yes
IP51
No
The exact difference (IP25 vs IP51)
Solid protection
IP25
Level 2 — > 12.5 mm — Finger
IP51
Level 5 — Dust-Protected
IP25 provides "> 12.5 mm — Finger" (level 2), while IP51 provides "Dust-Protected" (level 5). IP51 is 3 levels higher.
Liquid protection
IP25
Level 5 — Water Jets (6.3 mm nozzle)
IP51
Level 1 — Vertically Dripping Water
IP25 handles 30 kPa (Water Jets (6.3 mm nozzle)), while IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP25 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP25 offers higher overall protection than IP51. Choose IP25 for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.