IEC - NEMA Standard Torques
Comparing IEC and NEMA torque classifications of electrical motors
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NEMA (National Electrical Manufacturers Association) have classified electrical motors in four different NEMA designs where torques and starting-load inertia are important criterions.
Toques of IEC Design N motors are in general close to NEMA Design B motors. IEC Design N and NEMA Design B are the most commonly industrial used types.
Torques of IEC Design H are nearly identical to NEMA Design C.
| IEC/NEMA Standard Torques | ||||||
| Power (hp) | 2 Pole | 4 Pole | ||||
| Locked Rotor Torque | Pull Up Torque | Break Down Torque | Locked Rotor Torque | Pull Up Torque | Break Down Torque | |
| 3 | 170/160 | 110/110 | 200/230 | 180/215 | 120/150 | 200/250 |
| 5 | 160/150 | 110/105 | 200/215 | 170/185 | 120/130 | 200/225 |
| 7.5 | 150/140 | 100/100 | 200/200 | 160/175 | 110/120 | 200/215 |
| 10 | 150/135 | 100/100 | 200/200 | 160/165 | 110/115 | 200/200 |
| 15 - 20 | 140/130 | 100/100 | 200/200 | 150/150 | 110/105 | 200/200 |
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