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Electrical Motors - Full Load Amps

Full load currents for 460 volts, 230 volts and 115 volts motors - single and 3-phase

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As a "rules of thumb" amps horsepower rating can be estimated to

  • 115 volts motor - single-phase : 14 amps/hp
  • 230 volts motor - single-phase : 7 amps/hp
  • 230 volts motor - 3-phase : 2.5 amps/hp
  • 460 volts motor - 3-phase : 1.25 amps/hp

Always check nameplate information before designing protective devices, wiring and switch gear.

Electric motor

Single-Phase Motors - HP and Full-Load Currents

PowerFull Load Current (amp)
(hp)(kW)115 V208 V230 V
1/6 0.13 4.4 2.4 2.2
1/4 0.19 5.8 3.2 2.9
1/3 0.25 7.2 4.0 3.6
1/2 0.38 9.8 5.4 4.9
3/4 0.56 13.8 7.6 6.9
1 0.75 16 8.8 8
1 1/2 1.1 20 11 10
2 1.5 24 13.2 12
3 2.3 34 18.7 17
5 3.8 56 30.8 28

Three-Phase Motors - HP and Full-Load Currents

PowerFull-Load Current (amp)
Induction Type
Squirrel-Cage and Wound Motor
Synchronous Type
Unity Power Factor
(hp)(kW)115 V230 V460 V575 V2300 V230 V460 V575 V2300 V
1/2 0.38 4 2 1 0.8
3/4 0.56 5.6 2.8 1.4 1.1
1 0.75 7.2 3.6 1.8 1.4
1 1/2 1.1 10.4 5.2 2.6 2.1
2 1.5 13.6 6.8 3.4 2.7
3 2.3 9.6 4.8 3.9
5 3.8 15.2 7.6 6.1
7 1/2 5.6 22 11 9
10 7.5 28 14 11
15 11 42 21 17
20 15 54 27 22
25 19 68 34 27 53 26 21
30 23 80 40 32 63 32 26
40 30 104 52 41 83 41 33
50 38 130 65 52 104 52 42
60 45 154 77 62 16 123 61 49 12
75 56 192 96 77 20 155 78 62 15
100 75 248 124 99 26 202 101 81 20
  • 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h = 33.000 ft lb/m = 1.0139 metric horse power ~= 1.0 KVA

Direct Current Motors - Power and Full Load Currents

PowerDirect Current (A)
(kW)(hp)230 V440 V
1 1.4 6.4 3.2
1.5 2 9.5 4.8
2 2.7 13 6.5
3 4 18 9
4 5.5 24 12
5 7 29 14.5
6 8 34 17
7 9.5 40 20
8 11 45 22.5
9 12 50 25
10 13.5 56 28
12 16.5 66 33
15 20 85 42.5
20 27 110 55
30 40 160 80
40 55 210 110
50 68 260 130
60 82 300 150
70 95 360 180
80 110 400 200
90 125 450 225
100 136 500 250
  • for 115V - the amps is twice the ams for 230V
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