4.5 kVA to Amps at 208V Single-Phase AC
Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 4.5 kVA on a 208V Single-Phase AC circuit.
Line Current (0.85 PF)21.63 AAt 1.0 PF: 21.63 A
Active / Apparent Power3.82 kW4.5 kVA · 2.37 kVAR
Recommended Breaker30 A (NEC)25 A (IEC Nominal)
Recommended Copper Wire10 AWGIEC Metric: 6 mm²
Engineering Breakdown for 4.5 kVA at 208V
| Input Rating | 4.5 kVA (208V Single-Phase AC) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 21.63 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 21.63 Amps |
| Real Power (kW / Watts) | 3.82 kW (3,825 W) |
| Apparent Power (kVA) & Reactive Power (kVAR) | 4.5 kVA / 2.37 kVAR |
| Equivalent Mechanical Horsepower (HP) | 5.13 HP |
| NEC 125% Continuous Circuit Breaker | 30 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 10 AWG (NEC) / 6 mm² (IEC) |
Frequently Asked Questions
How many amps is 4.5 kVA at 208V (1-Phase)?
At 208V Single-Phase AC, 4.5 kVA equals 21.63 Amps at an industrial power factor of 0.85 (or 21.63 Amps at unity power factor 1.0).
What size breaker and wire is needed for 4.5 kVA at 208V?
For 21.63A continuous load, NEC requires a 125% rated breaker of 30A with 10 AWG copper conductors, while IEC standard sizing uses a 25A breaker with 6 mm² copper cable.
Other Power Ratings & Voltages
5 kVA at 208V (1P)10 kVA at 208V (1P)15 kVA at 208V (1P)20 kVA at 208V (1P)25 kVA at 208V (1P)30 kVA at 208V (1P)45 kVA at 208V (1P)50 kVA at 208V (1P)75 kVA at 208V (1P)100 kVA at 208V (1P)150 kVA at 208V (1P)200 kVA at 208V (1P)250 kVA at 208V (1P)500 kVA at 208V (1P)4.5 kVA at 120V Single-Phase AC4.5 kVA at 230V Single-Phase AC (IEC)4.5 kVA at 240V Single-Phase AC (NEC)4.5 kVA at 208V Three-Phase AC4.5 kVA at 230V Three-Phase AC4.5 kVA at 400V Three-Phase AC (IEC Europe)4.5 kVA at 415V Three-Phase AC (UK / AU)4.5 kVA at 480V Three-Phase AC (US Industrial)4.5 kVA at 600V Three-Phase AC (Canada / Heavy)4.5 kVA at 24V DC Direct Current4.5 kVA at 48V DC Battery / Telecom Bus