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

255 kVA 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 255 kVA on a 120V Single-Phase AC circuit.

Line Current (0.85 PF)2125.0 AAt 1.0 PF: 2125.0 A
Active / Apparent Power216.75 kW255.0 kVA · 134.33 kVAR
Recommended Breaker2700 A (NEC)2500 A (IEC Nominal)
Recommended Copper Wire4× 1000 kcmil (Parallel)IEC Metric: 4× 400 mm²

Engineering Breakdown for 255 kVA at 120V

Input Rating255 kVA (120V Single-Phase AC)
Amperage at 0.85 Power Factor (Industrial Motor/Transformer)2125.0 Amps
Amperage at 1.00 Power Factor (Resistive Load)2125.0 Amps
Real Power (kW / Watts)216.75 kW (216,750 W)
Apparent Power (kVA) & Reactive Power (kVAR)255.0 kVA / 134.33 kVAR
Equivalent Mechanical Horsepower (HP)290.67 HP
NEC 125% Continuous Circuit Breaker2700 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 255 kVA at 120V (1-Phase)?

At 120V Single-Phase AC, 255 kVA equals 2125.0 Amps at an industrial power factor of 0.85 (or 2125.0 Amps at unity power factor 1.0).

What size breaker and wire is needed for 255 kVA at 120V?

For 2125.0A continuous load, NEC requires a 125% rated breaker of 2700A with 4× 1000 kcmil (Parallel) copper conductors, while IEC standard sizing uses a 2500A breaker with 4× 400 mm² copper cable.

Other Power Ratings & Voltages

5 kVA at 120V (1P)10 kVA at 120V (1P)15 kVA at 120V (1P)20 kVA at 120V (1P)25 kVA at 120V (1P)30 kVA at 120V (1P)45 kVA at 120V (1P)50 kVA at 120V (1P)75 kVA at 120V (1P)100 kVA at 120V (1P)150 kVA at 120V (1P)200 kVA at 120V (1P)250 kVA at 120V (1P)500 kVA at 120V (1P)255 kVA at 208V Single-Phase AC255 kVA at 230V Single-Phase AC (IEC)255 kVA at 240V Single-Phase AC (NEC)255 kVA at 208V Three-Phase AC255 kVA at 230V Three-Phase AC255 kVA at 400V Three-Phase AC (IEC Europe)255 kVA at 415V Three-Phase AC (UK / AU)255 kVA at 480V Three-Phase AC (US Industrial)255 kVA at 600V Three-Phase AC (Canada / Heavy)255 kVA at 24V DC Direct Current255 kVA at 48V DC Battery / Telecom Bus