What does the IP rating mean?
The IP (Ingress Protection) rating is written as IP followed by two digits and describes how well a motor resists solids and water: the first digit (0–6) covers solids/dust, the second digit (0–9) covers water. A higher number means better protection, but also higher cost and more effort to cool.
| Rating | 1st digit (solid) | 2nd digit (water) | Typical environment |
|---|---|---|---|
| IP44 | 4 protected against >1mm solids | 4 splash-proof | General indoor, dry |
| IP54 | 5 dust-protected (not dust-tight) | 4 splash-proof | Outdoor, dusty |
| IP55 | 5 dust-protected | 5 protected against water jets | Dusty + rain / washdown |
| IP65 | 6 dust-tight | 5 water jets | Heavy dust, humid, washdown |
How to choose an IP rating
- Look at the environment: indoor dry → IP44/IP54; outdoor, dusty or wet → IP55; heavy dust, frequent washdown or very humid → IP65.
- Do not over-specify: higher IP is harder to cool and costs more; pick "just enough" and avoid excessive temperature rise.
- IP55 vs IP65: the key is the first digit — 5 is "dust-protected", 6 is "dust-tight". For genuinely dusty or sealed environments choose IP65.
- Match the standard: for export, choose per IEC 60034 / GB/T 755 and the local environment and IEC designation.
Common misconceptions
Is higher IP always better? Not necessarily — it usually means higher cost and more cooling burden; "just enough" is the economical choice.
Can an IP55 motor handle rain? It is protected against water jets (2nd digit = 5), so brief heavy rain is fine; continuous immersion or high-pressure washdown needs a higher water rating.
How we help
Tell us the operating environment (indoor/outdoor, dust load, washdown, temperature, humidity) and we will pick the right IEC IP rating and match a suitable frame — YE3 premium efficiency, Y high-voltage, YKK, TYPKK permanent-magnet and more.