300 kVA 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 300 kVA on a 480V Three-Phase AC (US Industrial) circuit.
Line Current (0.85 PF)360.84 AAt 1.0 PF: 360.84 A
Active / Apparent Power255.0 kW300.0 kVA · 158.03 kVAR
Recommended Breaker500 A (NEC)400 A (IEC Nominal)
Recommended Copper Wire500 kcmilIEC Metric: 240 mm²
Engineering Breakdown for 300 kVA at 480V
| Input Rating | 300 kVA (480V Three-Phase AC (US Industrial)) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 360.84 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 360.84 Amps |
| Real Power (kW / Watts) | 255.0 kW (255,000 W) |
| Apparent Power (kVA) & Reactive Power (kVAR) | 300.0 kVA / 158.03 kVAR |
| Equivalent Mechanical Horsepower (HP) | 341.96 HP |
| NEC 125% Continuous Circuit Breaker | 500 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 500 kcmil (NEC) / 240 mm² (IEC) |
Frequently Asked Questions
How many amps is 300 kVA at 480V (3-Phase)?
At 480V Three-Phase AC (US Industrial), 300 kVA equals 360.84 Amps at an industrial power factor of 0.85 (or 360.84 Amps at unity power factor 1.0).
What size breaker and wire is needed for 300 kVA at 480V?
For 360.84A continuous load, NEC requires a 125% rated breaker of 500A with 500 kcmil copper conductors, while IEC standard sizing uses a 400A breaker with 240 mm² copper cable.
Other Power Ratings & Voltages
5 kVA at 480V (3P)10 kVA at 480V (3P)15 kVA at 480V (3P)20 kVA at 480V (3P)25 kVA at 480V (3P)30 kVA at 480V (3P)45 kVA at 480V (3P)50 kVA at 480V (3P)75 kVA at 480V (3P)100 kVA at 480V (3P)150 kVA at 480V (3P)200 kVA at 480V (3P)250 kVA at 480V (3P)500 kVA at 480V (3P)300 kVA at 120V Single-Phase AC300 kVA at 208V Single-Phase AC300 kVA at 230V Single-Phase AC (IEC)300 kVA at 240V Single-Phase AC (NEC)300 kVA at 208V Three-Phase AC300 kVA at 230V Three-Phase AC300 kVA at 400V Three-Phase AC (IEC Europe)300 kVA at 415V Three-Phase AC (UK / AU)300 kVA at 600V Three-Phase AC (Canada / Heavy)300 kVA at 24V DC Direct Current300 kVA at 48V DC Battery / Telecom Bus