IP37 vs IP44
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP37 and IP44 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 3 vs 4) and liquid protection (level 7 vs 4). IP37 is rated for > 2.5 mm — tool / wire and temporary immersion (up to 1 m), while IP44 provides > 1 mm — small wires and splashing water (all directions).
Specified under IEC 60529, IP37 denotes protection against solid objects larger than 2.5 mm and protection against the effects of temporary immersion in water. Ingress of water in quantities causing harmful effects shall not be possible.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 3 with second-digit (liquid) level 7.
IP44 protects against small solid objects (1 mm) and splashing water from any direction. It is the common minimum rating for outdoor-covered fixtures and bathroom zone equipment.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP37
3 — > 2.5 mm — Tool / Wire
IP44
4 — > 1 mm — Small Wires
Liquid protection (second digit)
IP37
7 — Temporary Immersion (up to 1 m)
IP44
4 — Splashing Water (all directions)
Dust-tight
IP37
No
IP44
No
Water-jet resistant
IP37
Yes
IP44
No
Submersible
IP37
Yes
IP44
No
Outdoor suitable
IP37
Yes
IP44
Yes
The exact difference (IP37 vs IP44)
Solid protection
IP37
Level 3 — > 2.5 mm — Tool / Wire
IP44
Level 4 — > 1 mm — Small Wires
IP37 provides "> 2.5 mm — Tool / Wire" (level 3), while IP44 provides "> 1 mm — Small Wires" (level 4). IP44 is 1 level higher.
Liquid protection
IP37
Level 7 — Temporary Immersion (up to 1 m)
IP44
Level 4 — Splashing Water (all directions)
IP37 handles Hydrostatic ~10 kPa at 1 m (Temporary Immersion (up to 1 m)), while IP44 handles 50–100 kPa (Splashing Water (all directions)). IP37 provides 3 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP37 offers higher overall protection than IP44. Choose IP37 for harsher environments; IP44 may suffice for milder conditions and can be more cost-effective.