How Many Amps Is 37.25 kW at 575V?

37.25 kilowatts at 575V works out to roughly 44 amps on AC three-phase at PF 0.85. That is typical for commercial HVAC, industrial motors, rooftop units, and three-phase panel loads. See the DC and alternate-phase numbers below for other circuit types.

37.25 kW at 575V, AC three-phase (PF 0.85)

44 Amps

37.25 kilowatts at 575V on AC three-phase ≈ 44 amps

AC Single Phase (PF 0.85)76.21 A

DC (ideal baseline)64.78 A

Try: 35kW at 575V 40kW at 575V 30kW at 575V 25kW at 575V

Volts

Amps (AC three-phase, PF 0.85)

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 37.25 ÷ 575 = 37,248 ÷ 575 = 64.78 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

37,248 ÷ (0.85 × 575) = 37,248 ÷ 488.75 = 76.21 A

AC Three Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (√3 × PF × V_L-L), where V_L-L is the line-to-line voltage

37,248 ÷ (1.732 × 0.85 × 575) = 37,248 ÷ 846.52 = 44 A

Equipment & Circuit Sizing

Breaker Sizing

Breaker ratings are in amps, not watts, so the real install answer depends on the equipment nameplate FLA, whether the load is continuous (NEC 210.19(A) sizes the conductor and OCP at 125% of a continuous load, equivalently 80% of breaker rating), conductor ampacity and temperature rating, ambient and bundling derates, and any motor or HVAC provisions (NEC 430 / 440). At roughly 44A on AC three-phase at 575V, the load sits in the bracket between a 45A standard size (non-continuous) and the next size up that covers a continuous load under 210.19(A) (around 60A). The actual install pick depends on whether the load is continuous and the factors above; a conversion page can't pick a single "right" breaker from the amp draw alone.

Energy Cost

37.25 kW costs $6.33/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (AC three-phase)

How the line current for 37.25 kW at 575V changes with load power factor, on the same AC three-phase circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.

Load Type	PF	37.25 kW at 575V (AC three-phase)
Resistive (heaters, incandescent)	1	37.4 A
Fluorescent lamps	0.95	39.37 A
LED lighting	0.9	41.56 A
Synchronous motors	0.9	41.56 A
Typical mixed loads	0.85	44 A
Induction motors (full load)	0.8	46.75 A
Computers (without PFC)	0.65	57.54 A
Induction motors (no load)	0.35	106.86 A

AC Conversion Comparison

On DC, 37.25kW at 575V draws 64.78A. AC single-phase at PF 0.85 pulls 76.21A because reactive current is added on top of the real power. Three-phase at the same voltage needs only 44A per line since the same 37.25kW is shared across three conductors instead of one.

Circuit Type	Formula	Result
DC	37,248 ÷ 575	64.78 A
AC Single Phase (PF 0.85)	37,248 ÷ (0.85 × 575)	76.21 A
AC Three Phase (PF 0.85)	37,248 ÷ (1.732 × 0.85 × 575)	44 A

Other kW Values at 575V

kW	AC 3-Phase per line, PF 0.85	AC 1-Phase PF 0.85
6 kW	7.09 A	12.28 A
7.5 kW	8.86 A	15.35 A
8 kW	9.45 A	16.37 A
10 kW	11.81 A	20.46 A
12 kW	14.18 A	24.55 A
15 kW	17.72 A	30.69 A
18 kW	21.26 A	36.83 A
20 kW	23.63 A	40.92 A
22 kW	25.99 A	45.01 A
25 kW	29.53 A	51.15 A
30 kW	35.44 A	61.38 A
35 kW	41.34 A	71.61 A
40 kW	47.25 A	81.84 A
50 kW	59.06 A	102.3 A
60 kW	70.88 A	122.76 A

Same kW, Other Voltages

Each destination page leads with the interpretation most common for that voltage, so the amps shown below use the same basis as the page you'd land on: single-phase for residential voltages, three-phase for commercial/industrial panel voltages, DC for low-voltage.

electrical_services 37.25 kW at 208V = 121.64A (3-phase) electrical_services 37.25 kW at 400V = 63.25A (3-phase) electrical_services 37.25 kW at 460V = 55A (3-phase) electrical_services 37.25 kW at 480V = 52.71A (3-phase)

Related Calculations

bolt 37,248W to amps at 575V payments 37,248W running cost cable Wire size for 44A at 575V (3Φ)

Frequently Asked Questions

How many amps is 37.25 kW at 575V?expand_more

37.25 kW at 575V draws about 44 amps on an AC three-phase circuit at PF 0.85. Alternate cases at the same voltage: 64.78A on DC, 76.21A on AC single-phase.

How much does 37.25 kW cost to run?expand_more

37.25 kW costs $6.33 per hour at $0.17/kWh (US residential average, last reviewed April 2026). At 8 hours/day that is $1,519.72 per month.

How many amps does a 37.25 kW EV charger draw at 575V?expand_more

575V is commercial/industrial panel voltage, not a typical AC EVSE feed to a vehicle. On three-phase 575V, 37.25 kW works out to about 44A per line (three-phase at PF 0.85). In practice, 400-480V three-phase is usually the AC input to a DC fast charger (50-350 kW CCS/NACS stations like Tesla Superchargers), which rectifies to DC and delivers that directly to the vehicle, rather than an AC EVSE connector. A 37.25 kW figure at 575V is most likely the AC feed to a smaller commercial cabinet or the control-side input of a larger DC fast charger, not an at-the-car AC current.

What is the formula for kW to amps?expand_more

DC: Amps = (kW × 1000) ÷ Volts. AC single-phase: Amps = (kW × 1000) ÷ (Volts × PF). AC three-phase: Amps = (kW × 1000) ÷ (Volts_L-L × √3 × PF).

How does three-phase affect the amps for 37.25 kW?expand_more

Three-phase at 575V draws 44A per line versus 76.21A single-phase. Less current per conductor means smaller wire and lower I²R losses.

This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.