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

138 kW to Amps at 208V Three-Phase AC

Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 138 kW on a 208V Three-Phase AC circuit.

Line Current (0.85 PF)450.65 AAt 1.0 PF: 383.05 A
Active / Apparent Power138.0 kW162.35 kVA · 85.52 kVAR
Recommended Breaker600 A (NEC)500 A (IEC Nominal)
Recommended Copper Wire750 kcmilIEC Metric: 300 mm²

Engineering Breakdown for 138 kW at 208V

Input Rating138 kW (208V Three-Phase AC)
Amperage at 0.85 Power Factor (Industrial Motor/Transformer)450.65 Amps
Amperage at 1.00 Power Factor (Resistive Load)383.05 Amps
Real Power (kW / Watts)138.0 kW (138,000 W)
Apparent Power (kVA) & Reactive Power (kVAR)162.35 kVA / 85.52 kVAR
Equivalent Mechanical Horsepower (HP)185.06 HP
NEC 125% Continuous Circuit Breaker600 A
Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop)750 kcmil (NEC) / 300 mm² (IEC)

Frequently Asked Questions

How many amps is 138 kW at 208V (3-Phase)?

At 208V Three-Phase AC, 138 kW equals 450.65 Amps at an industrial power factor of 0.85 (or 383.05 Amps at unity power factor 1.0).

What size breaker and wire is needed for 138 kW at 208V?

For 450.65A continuous load, NEC requires a 125% rated breaker of 600A with 750 kcmil copper conductors, while IEC standard sizing uses a 500A breaker with 300 mm² copper cable.

Other Power Ratings & Voltages

5 kW at 208V (3P)10 kW at 208V (3P)15 kW at 208V (3P)20 kW at 208V (3P)25 kW at 208V (3P)30 kW at 208V (3P)45 kW at 208V (3P)50 kW at 208V (3P)75 kW at 208V (3P)100 kW at 208V (3P)150 kW at 208V (3P)200 kW at 208V (3P)250 kW at 208V (3P)500 kW at 208V (3P)138 kW at 120V Single-Phase AC138 kW at 208V Single-Phase AC138 kW at 230V Single-Phase AC (IEC)138 kW at 240V Single-Phase AC (NEC)138 kW at 230V Three-Phase AC138 kW at 400V Three-Phase AC (IEC Europe)138 kW at 415V Three-Phase AC (UK / AU)138 kW at 480V Three-Phase AC (US Industrial)138 kW at 600V Three-Phase AC (Canada / Heavy)138 kW at 24V DC Direct Current138 kW at 48V DC Battery / Telecom Bus