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Electrical Motor - Full Load Current
Full load current - 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 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 | 230 V | |
| 1/6 | 4.4 | 2.2 |
| 1/4 | 5.8 | 2.9 |
| 1/3 | 7.2 | 3.6 |
| 1/2 | 9.8 | 4.9 |
| 3/4 | 13.8 | 6.9 |
| 1 | 16 | 8 |
| 1 1/2 | 20 | 10 |
| 2 | 24 | 12 |
| 3 | 34 | 17 |
| 5 | 56 | 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
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Related Topics
- Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units
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