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🏭 Industrial Electrical Conversion · Three-Phase & Single-Phase

400 kVA 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 400 kVA on a 240V Single-Phase AC (NEC) circuit.

Line Current (0.85 PF)1666.67 AAt 1.0 PF: 1666.67 A
Active / Apparent Power340.0 kW400.0 kVA · 210.71 kVAR
Recommended Breaker2500 A (NEC)2000 A (IEC Nominal)
Recommended Copper Wire4× 1000 kcmil (Parallel)IEC Metric: 3× 400 mm²

Engineering Breakdown for 400 kVA at 240V

Input Rating400 kVA (240V Single-Phase AC (NEC))
Amperage at 0.85 Power Factor (Industrial Motor/Transformer)1666.67 Amps
Amperage at 1.00 Power Factor (Resistive Load)1666.67 Amps
Real Power (kW / Watts)340.0 kW (340,000 W)
Apparent Power (kVA) & Reactive Power (kVAR)400.0 kVA / 210.71 kVAR
Equivalent Mechanical Horsepower (HP)455.95 HP
NEC 125% Continuous Circuit Breaker2500 A
Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop)4× 1000 kcmil (Parallel) (NEC) / 3× 400 mm² (IEC)

Frequently Asked Questions

How many amps is 400 kVA at 240V (1-Phase)?

At 240V Single-Phase AC (NEC), 400 kVA equals 1666.67 Amps at an industrial power factor of 0.85 (or 1666.67 Amps at unity power factor 1.0).

What size breaker and wire is needed for 400 kVA at 240V?

For 1666.67A 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 3× 400 mm² copper cable.

Other Power Ratings & Voltages

5 kVA at 240V (1P)10 kVA at 240V (1P)15 kVA at 240V (1P)20 kVA at 240V (1P)25 kVA at 240V (1P)30 kVA at 240V (1P)45 kVA at 240V (1P)50 kVA at 240V (1P)75 kVA at 240V (1P)100 kVA at 240V (1P)150 kVA at 240V (1P)200 kVA at 240V (1P)250 kVA at 240V (1P)500 kVA at 240V (1P)400 kVA at 120V Single-Phase AC400 kVA at 208V Single-Phase AC400 kVA at 230V Single-Phase AC (IEC)400 kVA at 208V Three-Phase AC400 kVA at 230V Three-Phase AC400 kVA at 400V Three-Phase AC (IEC Europe)400 kVA at 415V Three-Phase AC (UK / AU)400 kVA at 480V Three-Phase AC (US Industrial)400 kVA at 600V Three-Phase AC (Canada / Heavy)400 kVA at 24V DC Direct Current400 kVA at 48V DC Battery / Telecom Bus