kVA to Amps Calculator

Calculate current (Amps) from kVA (Kilovolt-Amperes) for both single-phase and three-phase systems.

kVA to Amps Conversion

Single Phase kVA to Amps Calculation

For single-phase systems, the current (I) in amperes can be calculated from kilovolt-amperes (kVA) using the following formula:

I(A) = 1000 × S(kVA) / V(V)

Where:

  • I(A) Current in Amperes (A)
  • S(kVA) Apparent power in Kilovolt-Amperes (kVA)
  • V(V) Voltage in Volts (V)
  • 1000 Conversion factor from kVA to VA

Key Point: The multiplication by 1000 is necessary to convert kVA to VA before calculating the current.

Three Phase kVA to Amps Calculations

Line-to-Line Voltage Method

For three-phase systems using line-to-line voltage (most industrial applications):

I(A) = 1000 × S(kVA) / (√3 × VL-L(V))

Where:

  • I(A) Current in Amperes (A)
  • S(kVA) Three-phase apparent power in Kilovolt-Amperes (kVA)
  • VL-L Line-to-line voltage (V)
  • √3 Square root of 3 (approximately 1.732)

Line-to-Neutral Voltage Method

For three-phase systems using line-to-neutral voltage:

I(A) = 1000 × S(kVA) / (3 × VL-N(V))

Where:

  • I(A) Current in Amperes (A)
  • S(kVA) Three-phase apparent power in Kilovolt-Amperes (kVA)
  • VL-N Line-to-neutral voltage (V)

Practical Examples

Single Phase Example

Given:

  • Apparent Power = 5 kVA
  • Voltage = 230 V

Calculation:

I(A) = (1000 × 5 kVA) / 230 V = 21.74 A

Three Phase Example

Given:

  • Apparent Power = 10 kVA
  • Line-to-Line Voltage = 400 V

Calculation:

I(A) = (1000 × 10 kVA) / (√3 × 400 V) = 14.43 A

Important Note: Always round calculations to two decimal places for practical applications. In real-world scenarios, consider safety factors and local electrical codes when sizing equipment.

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