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title: Motor Insulation Class - EURARI
description: Motor insulation classes A, E, B, F and H explained: temperature limits, standards and impact on motor life and rating. EURARI technical reference.
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Technical Information for Motor-Gearbox Combinations, ⑥, Understanding Motor Insulation Class

Insulation class of motor refers to the heating resistance class of insulation material including A, E, B, F, H, C, N, R. Insulation class of motor is using E, B, F, H mostly) The insulation classes herein are defined in accordance with NEMA standards.

 | Temperature class | Class A | Class E | Class B | Class F | Class H | Class C | Class N | Class R |
|---|---|---|---|---|---|---|---|---|
| Max allowable temperature) | 105℃ | 120℃ | 130℃ | 155℃ | 180℃ | 200℃ | 220℃ | 240℃ |
| Winding temperature rise limit | 60K | 75K | 80K | 105K | 125K | 135K | 150K | 170K |
| Performance reference temperature | 80℃ | 95℃ | 100℃ | 120℃ | 145℃ | 155℃ | 170℃ | 190℃ |

\*All winding temperature rise limits are based on a 40°C ambient temperature.

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