IP41 vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP41 and IP51 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 4 vs 5). IP41 is rated for > 1 mm — small wires and vertically dripping water, while IP51 provides dust-protected and vertically dripping water.
Under IEC 60529, IP41 specifies protection against solid objects larger than 1.0 mm 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 4 with second-digit (liquid) level 1.
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)
IP41
4 — > 1 mm — Small Wires
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP41
1 — Vertically Dripping Water
IP51
1 — Vertically Dripping Water
Dust-tight
IP41
No
IP51
Limited
Water-jet resistant
IP41
No
IP51
No
Submersible
IP41
No
IP51
No
Outdoor suitable
IP41
No
IP51
No
The exact difference (IP41 vs IP51)
Solid protection
IP41
Level 4 — > 1 mm — Small Wires
IP51
Level 5 — Dust-Protected
IP41 provides "> 1 mm — Small Wires" (level 4), while IP51 provides "Dust-Protected" (level 5). IP51 is 1 level higher.
Liquid protection
IP41
Level 1 — Vertically Dripping Water
IP51
Level 1 — Vertically Dripping Water
Both IP41 and IP51 share the same liquid protection: Vertically Dripping Water.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP51 offers higher overall protection than IP41. Choose IP51 for harsher environments; IP41 may suffice for milder conditions and can be more cost-effective.