IP09K vs IP51
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP09K and IP51 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 0 vs 5) and liquid protection (level 9K vs 1). IP09K is rated for no protection and high-pressure, high-temp water jets, while IP51 provides dust-protected and vertically dripping water.
The IP09K rating offers no protection against solid objects and resistance to high-pressure (8–10 MPa), high-temperature (80 °C) water jets. It is an IEC 60529 ingress protection code combining first-digit (solid) level 0 with second-digit (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)
IP09K
0 — No Protection
IP51
5 — Dust-Protected
Liquid protection (second digit)
IP09K
9 — High-Pressure, High-Temp Water Jets
IP51
1 — Vertically Dripping Water
Dust-tight
IP09K
No
IP51
Limited
Water-jet resistant
IP09K
Yes
IP51
No
Submersible
IP09K
Yes
IP51
No
Outdoor suitable
IP09K
Yes
IP51
No
The exact difference (IP09K vs IP51)
Solid protection
IP09K
Level 0 — No Protection
IP51
Level 5 — Dust-Protected
IP09K provides "No Protection" (level 0), while IP51 provides "Dust-Protected" (level 5). IP51 is 5 levels higher.
Liquid protection
IP09K
Level 9 — High-Pressure, High-Temp Water Jets
IP51
Level 1 — Vertically Dripping Water
IP09K handles 8–10 MPa (High-Pressure, High-Temp Water Jets), while IP51 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP09K provides 8 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP09K offers higher overall protection than IP51. Choose IP09K for harsher environments; IP51 may suffice for milder conditions and can be more cost-effective.