IEC - NEMA Standard Torques
IEC and NEMA torque classifications of electrical motors
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NEMA (National Electrical Manufacturers Association) has classified electrical motors in four different NEMA designs where torque and starting-load inertia are important criteria.
Torques of the IEC Design N motors are in general close to NEMA Design B motors. IEC Design N and NEMA Design B are the most commonly used industrial types.
Torques of the IEC Design H are nearly identical to NEMA Design C.
| IEC/NEMA Standard Torques (lb ft) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
- 1 lb ft = 1.356 Nm
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