IP49K vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP49K and IP51 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 4 vs 5) and liquid protection (level 9K vs 1). IP49K is rated for > 1 mm — small wires and high-pressure, high-temp water jets, while IP51 provides dust-protected and vertically dripping water.
Built to withstand protection against solid objects larger than 1.0 mm and resistance to high-pressure (8–10 MPa), high-temperature (80 °C) water jets. Classified as IEC 60529 ingress protection code IP49K, it pairs solid level 4 with liquid level 9K.
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)
IP49K
4 — > 1 mm — Small Wires
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP49K
9 — High-Pressure, High-Temp Water Jets
IP51
1 — Vertically Dripping Water
Dust-tight
IP49K
No
IP51
Limited
Water-jet resistant
IP49K
Yes
IP51
No
Submersible
IP49K
Yes
IP51
No
Outdoor suitable
IP49K
Yes
IP51
No
The exact difference (IP49K vs IP51)
Solid protection
IP49K
Level 4 — > 1 mm — Small Wires
IP51
Level 5 — Dust-Protected
IP49K provides "> 1 mm — Small Wires" (level 4), while IP51 provides "Dust-Protected" (level 5). IP51 is 1 level higher.
Liquid protection
IP49K
Level 9 — High-Pressure, High-Temp Water Jets
IP51
Level 1 — Vertically Dripping Water
IP49K handles 8–10 MPa (High-Pressure, High-Temp Water Jets), while IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP49K provides 8 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP49K offers higher overall protection than IP51. Choose IP49K for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.