25 kW to Amps at 120V Single-Phase AC
Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 25 kW on a 120V Single-Phase AC circuit.
Line Current (0.85 PF)245.1 AAt 1.0 PF: 208.33 A
Active / Apparent Power25.0 kW29.41 kVA · 15.49 kVAR
Recommended Breaker350 A (NEC)250 A (IEC Nominal)
Recommended Copper Wire250 kcmilIEC Metric: 120 mm²
Engineering Breakdown for 25 kW at 120V
| Input Rating | 25 kW (120V Single-Phase AC) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 245.1 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 208.33 Amps |
| Real Power (kW / Watts) | 25.0 kW (25,000 W) |
| Apparent Power (kVA) & Reactive Power (kVAR) | 29.41 kVA / 15.49 kVAR |
| Equivalent Mechanical Horsepower (HP) | 33.53 HP |
| NEC 125% Continuous Circuit Breaker | 350 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 250 kcmil (NEC) / 120 mm² (IEC) |
Frequently Asked Questions
How many amps is 25 kW at 120V (1-Phase)?
At 120V Single-Phase AC, 25 kW equals 245.1 Amps at an industrial power factor of 0.85 (or 208.33 Amps at unity power factor 1.0).
What size breaker and wire is needed for 25 kW at 120V?
For 245.1A continuous load, NEC requires a 125% rated breaker of 350A with 250 kcmil copper conductors, while IEC standard sizing uses a 250A breaker with 120 mm² copper cable.
Other Power Ratings & Voltages
5 kW at 120V (1P)10 kW at 120V (1P)15 kW at 120V (1P)20 kW at 120V (1P)30 kW at 120V (1P)45 kW at 120V (1P)50 kW at 120V (1P)75 kW at 120V (1P)100 kW at 120V (1P)150 kW at 120V (1P)200 kW at 120V (1P)250 kW at 120V (1P)500 kW at 120V (1P)25 kW at 208V Single-Phase AC25 kW at 230V Single-Phase AC (IEC)25 kW at 240V Single-Phase AC (NEC)25 kW at 208V Three-Phase AC25 kW at 230V Three-Phase AC25 kW at 400V Three-Phase AC (IEC Europe)25 kW at 415V Three-Phase AC (UK / AU)25 kW at 480V Three-Phase AC (US Industrial)25 kW at 600V Three-Phase AC (Canada / Heavy)25 kW at 24V DC Direct Current25 kW at 48V DC Battery / Telecom Bus