1250 kW to Amps at 240V Single-Phase AC (NEC)
Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 1250 kW on a 240V Single-Phase AC (NEC) circuit.
Line Current (0.85 PF)6127.45 AAt 1.0 PF: 5208.33 A
Active / Apparent Power1250.0 kW1470.59 kVA · 774.68 kVAR
Recommended Breaker7700 A (NEC)6200 A (IEC Nominal)
Recommended Copper Wire12× 1000 kcmil (Parallel)IEC Metric: 11× 400 mm²
Engineering Breakdown for 1250 kW at 240V
| Input Rating | 1250 kW (240V Single-Phase AC (NEC)) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 6127.45 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 5208.33 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 | 7700 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 12× 1000 kcmil (Parallel) (NEC) / 11× 400 mm² (IEC) |
Frequently Asked Questions
How many amps is 1250 kW at 240V (1-Phase)?
At 240V Single-Phase AC (NEC), 1250 kW equals 6127.45 Amps at an industrial power factor of 0.85 (or 5208.33 Amps at unity power factor 1.0).
What size breaker and wire is needed for 1250 kW at 240V?
For 6127.45A continuous load, NEC requires a 125% rated breaker of 7700A with 12× 1000 kcmil (Parallel) copper conductors, while IEC standard sizing uses a 6200A breaker with 11× 400 mm² copper cable.
Other Power Ratings & Voltages
5 kW at 240V (1P)10 kW at 240V (1P)15 kW at 240V (1P)20 kW at 240V (1P)25 kW at 240V (1P)30 kW at 240V (1P)45 kW at 240V (1P)50 kW at 240V (1P)75 kW at 240V (1P)100 kW at 240V (1P)150 kW at 240V (1P)200 kW at 240V (1P)250 kW at 240V (1P)500 kW at 240V (1P)1250 kW at 120V Single-Phase AC1250 kW at 208V Single-Phase AC1250 kW at 230V Single-Phase AC (IEC)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 480V Three-Phase AC (US Industrial)1250 kW at 600V Three-Phase AC (Canada / Heavy)1250 kW at 24V DC Direct Current1250 kW at 48V DC Battery / Telecom Bus