IP58 vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP58 and IP51 are both IEC 60529 ingress protection codes, but they differ in liquid protection (level 8 vs 1). IP58 is rated for dust-protected and continuous immersion (manufacturer-specified), while IP51 provides dust-protected and vertically dripping water.
IP58 is dust-protected and rated for continuous immersion in water under manufacturer-specified conditions. A niche rating for equipment that must operate submerged while allowing limited dust ingress.
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)
IP58
5 — Dust-Protected
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP58
8 — Continuous Immersion (manufacturer-specified)
IP51
1 — Vertically Dripping Water
Dust-tight
IP58
Limited
IP51
Limited
Water-jet resistant
IP58
Yes
IP51
No
Submersible
IP58
Yes
IP51
No
Outdoor suitable
IP58
Yes
IP51
No
The exact difference (IP58 vs IP51)
Solid protection
IP58
Level 5 — Dust-Protected
IP51
Level 5 — Dust-Protected
Both IP58 and IP51 share the same solid protection: Dust-Protected.
Liquid protection
IP58
Level 8 — Continuous Immersion (manufacturer-specified)
IP51
Level 1 — Vertically Dripping Water
IP58 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)), while IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP58 provides 7 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP58 offers higher overall protection than IP51. Choose IP58 for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.