Maximum Locked-Rotor Currents - Three-Phase Squirrel Cage Motors - EASA Electrical Engineering Handbook

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Maximum Locked-Rotor Currents
Three-Phase Squirrel Cage Motors
NEMA Designs B, C & D

Locked-Rotor Current in Amperes
HP	Rated Voltage
HP	200V	230V	460V	575V	2300V	4000V
.5 .75 1	23 29 34	20 25 30	10 12 15	8 10 12
1.5 2 3	46 57 74	40 50 64	20 25 32	16 20 26
5 7.5 10	106 146 186	92 127 162	46 63 81	37 51 65
15 20 25	267 333 420	232 290 365	116 145 182	93 116 146
30 40 50	500 667 834	435 580 725	217 290 362	174 232 290
60 75 100	1000 1250 1665	870 1085 1450	435 542 725	348 434 580	87 108 145	50 62 83
125 150 200	2085 2500 3335	1815 2170 2900	907 1085 1450	726 868 1160	181 217 290	104 125 167
250 300 350	4200 5060 5860	3650 4400 5100	1825 2200 2550	1460 1760 2040	365 440 510	210 253 293
400 450 500	6670 7470 8340	5800 6500 7250	2900 3250 3625	2320 2600 2900	580 650 725	333 374 417

The locked-rotor current of Design B, C and D constant-speed induction motors, when measured with rated voltage and frequency impressed and with rotor locked, shall not exceed the above values.
Reference: NEMA Standards MG 1-12.35.

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Maximum Locked-Rotor Currents
Three-Phase Squirrel Cage Motors
NEMA Design E

Locked-Rotor Current in Amperes
HP	Rated Voltage
HP	200V	230V	460V	575V	2300V	4000V
.5 .75 1	23 29 35	20 25 30	10 13 15	8 10 12
1.5 2 3	46 58 84	40 50 73	20 25 37	16 20 29
5 7.5 10	114 210 259	122 183 225	61 92 113	49 73 90
15 20 25	388 516 646	337 449 562	169 225 281	135 180 225
30 40 50	775 948 1185	674 824 1030	337 412 515	270 330 412
60 75 100	1421 1777 2154	1236 1545 1873	618 773 937	494 618 749	124 155 187	71 89 108
125 150 200	2692 3230 4307	2341 2809 3745	1171 1405 1873	936 1124 1498	234 281 375	135 162 215
250 300 350	5391 6461 7537	4688 5618 6554	2344 2809 3277	1875 2247 2622	469 562 655	270 323 377
400 450 500	8614 9691 10767	7490 8427 9363	3745 4214 4682	2996 3371 3745	749 843 936	431 485 538

The locked-rotor current of Design E constant-speed induction motors, when measured with rated voltage and frequency impressed and with rotor locked, shall not exceed the above values.
Reference: NEMA Standards MG 1-12.35A.

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