IP55 vs IP49K
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP55 and IP49K are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 4) and liquid protection (level 5 vs 9K). IP55 is rated for dust-protected and water jets (6.3 mm nozzle), while IP49K provides > 1 mm — small wires and high-pressure, high-temp water jets.
IP55 is dust-protected and resists low-pressure water jets (6.3 mm nozzle, 30 kPa). A popular industrial rating for equipment exposed to dust and directed water spray but not immersion.
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.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP55
5 — Dust-Protected
IP49K
4 — > 1 mm — Small Wires
Liquid protection (second digit)
IP55
5 — Water Jets (6.3 mm nozzle)
IP49K
9 — High-Pressure, High-Temp Water Jets
Dust-tight
IP55
Limited
IP49K
No
Water-jet resistant
IP55
Yes
IP49K
Yes
Submersible
IP55
No
IP49K
Yes
Outdoor suitable
IP55
Yes
IP49K
Yes
The exact difference (IP55 vs IP49K)
Solid protection
IP55
Level 5 — Dust-Protected
IP49K
Level 4 — > 1 mm — Small Wires
IP55 provides "Dust-Protected" (level 5), while IP49K provides "> 1 mm — Small Wires" (level 4). IP55 is 1 level higher.
Liquid protection
IP55
Level 5 — Water Jets (6.3 mm nozzle)
IP49K
Level 9 — High-Pressure, High-Temp Water Jets
IP55 handles 30 kPa (Water Jets (6.3 mm nozzle)), while IP49K handles 8–10 MPa (High-Pressure, High-Temp Water Jets). IP49K provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP49K offers higher overall protection than IP55. Choose IP49K for harsher environments; IP55 may suffice for milder conditions and can be more cost-effective.