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Full load current - 460 Volts, 230 Volts and 115 Volts motors - single and 3-phase

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

  • 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 switchgear.

Single-Phase Motors - HP and Full-Load Currents

Motor Size 

(hp)

 Full Load Current (Amps)
115 V 208 V 230 V
1/6 4.4 2.4 2.2
1/4 5.8 3.2 2.9
1/3 7.2 4.0 3.6
1/2 9.8 5.4 4.9
3/4 13.8 7.6 6.9
1 16 8.8 8
1 1/2 20 11 10
2 24 13.2 12
3 34 18.7 17
5 56 30.8 28

Three-Phase Motors - HP and Full-Load Currents

Motor Size

(hp)

 Full-Load Current (Amps)

Induction Type

Squirrel-Cage and Wound Motor

Synchronous Type

Unity Power Factor
115 V 230 V 460 V 575 V 2300 V 230 V 460 V 575 V 2300 V
1/2 4 2 1 0.8          
3/4 5.6 2.8 1.4 1.1          
1 7.2 3.6 1.8 1.4          
1 1/2 10.4 5.2 2.6 2.1          
2 13.6 6.8 3.4 2.7          
3   9.6 4.8 3.9          
5   15.2 7.6 6.1          
7 1/2   22 11 9          
10   28 14 11          
15   42 21 17          
20   54 27 22          
25   68 34 27   53 26 21  
30   80 40 32   63 32 26  
40   104 52 41   83 41 33  
50   130 65 52   104 52 42  
60   154 77 62 16 123 61 49 12
75   192 96 77 20 155 78 62 15
100   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