1250 kW to Amps at 480V Three-Phase AC (US Industrial)
Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 1250 kW on a 480V Three-Phase AC (US Industrial) circuit.
Line Current (0.85 PF)1768.84 AAt 1.0 PF: 1503.52 A
Active / Apparent Power1250.0 kW1470.59 kVA · 774.68 kVAR
Recommended Breaker2500 A (NEC)2000 A (IEC Nominal)
Recommended Copper Wire4× 1000 kcmil (Parallel)IEC Metric: 4× 400 mm²
Engineering Breakdown for 1250 kW at 480V
| Input Rating | 1250 kW (480V Three-Phase AC (US Industrial)) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 1768.84 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 1503.52 Amps |
| Real Power (kW / Watts) | 1250.0 kW (1,250,000 W) |
| Apparent Power (kVA) & Reactive Power (kVAR) | 1470.59 kVA / 774.68 kVAR |
| Equivalent Mechanical Horsepower (HP) | 1676.28 HP |
| NEC 125% Continuous Circuit Breaker | 2500 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 4× 1000 kcmil (Parallel) (NEC) / 4× 400 mm² (IEC) |
Frequently Asked Questions
How many amps is 1250 kW at 480V (3-Phase)?
At 480V Three-Phase AC (US Industrial), 1250 kW equals 1768.84 Amps at an industrial power factor of 0.85 (or 1503.52 Amps at unity power factor 1.0).
What size breaker and wire is needed for 1250 kW at 480V?
For 1768.84A continuous load, NEC requires a 125% rated breaker of 2500A with 4× 1000 kcmil (Parallel) copper conductors, while IEC standard sizing uses a 2000A breaker with 4× 400 mm² copper cable.
Other Power Ratings & Voltages
5 kW at 480V (3P)10 kW at 480V (3P)15 kW at 480V (3P)20 kW at 480V (3P)25 kW at 480V (3P)30 kW at 480V (3P)45 kW at 480V (3P)50 kW at 480V (3P)75 kW at 480V (3P)100 kW at 480V (3P)150 kW at 480V (3P)200 kW at 480V (3P)250 kW at 480V (3P)500 kW at 480V (3P)1250 kW at 120V Single-Phase AC1250 kW at 208V Single-Phase AC1250 kW at 230V Single-Phase AC (IEC)1250 kW at 240V Single-Phase AC (NEC)1250 kW at 208V Three-Phase AC1250 kW at 230V Three-Phase AC1250 kW at 400V Three-Phase AC (IEC Europe)1250 kW at 415V Three-Phase AC (UK / AU)1250 kW at 600V Three-Phase AC (Canada / Heavy)1250 kW at 24V DC Direct Current1250 kW at 48V DC Battery / Telecom Bus