Electric Motors - IEC and 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
Power (hp)	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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Electric Motors - IEC and NEMA Standard Torques

IEC and NEMA torque classifications of electrical motors.

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