How Many Amps Is 7.5 kW?
7.5 kW = 7,500 W. At 240 V single-phase (PF 0.8): 39.0625 A. At 400 V three-phase (PF 0.8): 13.5316 A per phase. As DC at 240 V: 31.2500 A. Use the calculator below for any voltage or circuit type.
Real example: a 7.5 kW (10 HP) three-phase motor
7.5 kW is the metric rating of a 10 HP three-phase motor. Motors are almost always three-phase: at 400 V PF 0.8 the line current is about 13.5 A per phase, at 480 V about 11.3 A. As single-phase 240 V it would be an impractical 39 A.
7.5 kW to Amps — Reference Chart
| Circuit | Voltage | PF | Amps |
|---|---|---|---|
| DC | 120 V | — | 62.5000 A |
| DC | 240 V | — | 31.2500 A |
| DC | 480 V | — | 15.6250 A |
| AC 1Ø | 120 V | 1.0 | 62.5000 A |
| AC 1Ø | 240 V | 1.0 | 31.2500 A |
| AC 1Ø | 240 V | 0.8 | 39.0625 A |
| AC 3Ø (L-L) | 208 V | 0.8 | 26.0224 A |
| AC 3Ø (L-L) | 400 V | 0.8 | 13.5316 A |
| AC 3Ø (L-L) | 480 V | 0.8 | 11.2764 A |
Wire & breaker: Motor circuits are not sized by the 125% rule. NEC Article 430 uses full-load-current (FLC) tables plus branch-circuit protection up to 250% of FLC for the starting surge, and overloads set at 115–125%. A 10 HP 400 V motor's FLC and breaker come from those tables — have an electrician size it. Background: watts vs amps.
Frequently Asked Questions
How many amps is 7.5 kW at 240V single-phase?
7.5 kW at 240V DC or PF 1 = (7.5 × 1,000) ÷ 240 = 31.2500 amps. For AC single-phase with PF 0.8: 7,500 ÷ (240 × 0.8) = 39.0625 amps.
How many amps is 7.5 kW on a 400V three-phase supply?
7.5 kW on 400V three-phase at PF 0.8 = (7.5 × 1,000) ÷ (√3 × 400 × 0.8) = 13.5316 amps per phase. At unity PF: 10.8253 amps.
How many amps does a 7.5 kW three-phase motor draw?
At 400 V three-phase, PF 0.8: 7,500 ÷ (√3 × 400 × 0.8) = 13.5316 A per phase. At 480 V it drops to 11.2764 A. Use the motor's nameplate FLC for actual wiring — see kW to amps.