20 kW to Amps at 415V Three-Phase AC (UK / AU)
Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 20 kW on a 415V Three-Phase AC (UK / AU) circuit.
Line Current (0.85 PF)32.73 AAt 1.0 PF: 27.82 A
Active / Apparent Power20.0 kW23.53 kVA · 12.39 kVAR
Recommended Breaker45 A (NEC)35 A (IEC Nominal)
Recommended Copper Wire8 AWGIEC Metric: 6 mm²
Engineering Breakdown for 20 kW at 415V
| Input Rating | 20 kW (415V Three-Phase AC (UK / AU)) |
| Amperage at 0.85 Power Factor (Industrial Motor/Transformer) | 32.73 Amps |
| Amperage at 1.00 Power Factor (Resistive Load) | 27.82 Amps |
| Real Power (kW / Watts) | 20.0 kW (20,000 W) |
| Apparent Power (kVA) & Reactive Power (kVAR) | 23.53 kVA / 12.39 kVAR |
| Equivalent Mechanical Horsepower (HP) | 26.82 HP |
| NEC 125% Continuous Circuit Breaker | 45 A |
| Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop) | 8 AWG (NEC) / 6 mm² (IEC) |
Frequently Asked Questions
How many amps is 20 kW at 415V (3-Phase)?
At 415V Three-Phase AC (UK / AU), 20 kW equals 32.73 Amps at an industrial power factor of 0.85 (or 27.82 Amps at unity power factor 1.0).
What size breaker and wire is needed for 20 kW at 415V?
For 32.73A continuous load, NEC requires a 125% rated breaker of 45A with 8 AWG copper conductors, while IEC standard sizing uses a 35A breaker with 6 mm² copper cable.
Other Power Ratings & Voltages
5 kW at 415V (3P)10 kW at 415V (3P)15 kW at 415V (3P)25 kW at 415V (3P)30 kW at 415V (3P)45 kW at 415V (3P)50 kW at 415V (3P)75 kW at 415V (3P)100 kW at 415V (3P)150 kW at 415V (3P)200 kW at 415V (3P)250 kW at 415V (3P)500 kW at 415V (3P)20 kW at 120V Single-Phase AC20 kW at 208V Single-Phase AC20 kW at 230V Single-Phase AC (IEC)20 kW at 240V Single-Phase AC (NEC)20 kW at 208V Three-Phase AC20 kW at 230V Three-Phase AC20 kW at 400V Three-Phase AC (IEC Europe)20 kW at 480V Three-Phase AC (US Industrial)20 kW at 600V Three-Phase AC (Canada / Heavy)20 kW at 24V DC Direct Current20 kW at 48V DC Battery / Telecom Bus