1. What is kW to Amps 3 Phase Conversion?

Definition: This calculator converts electrical power in kilowatts (kW) to current in amperes (A) for three-phase AC systems.

Purpose: Essential for electrical engineers, technicians, and electricians to properly size wires, breakers, and other components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amperes)
• \( P_{kW} \) — Power (kilowatts)
• \( V \) — Line-to-line voltage (volts)
• \( PF \) — Power factor (0 to 1)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula accounts for all three phases and the phase relationship between voltage and current.

3. Importance of Accurate Conversion

Details: Proper current calculation prevents equipment damage, ensures safety, and maintains system efficiency.

4. Using the Calculator

Tips: Enter power in kW, line-to-line voltage (default 480V), and power factor (default 0.85). All values must be > 0, PF between 0.01 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: Line voltage is between any two lines, phase voltage is between line and neutral (line voltage = phase voltage × √3).

Q2: Why is power factor important?
A: It represents the ratio of real power to apparent power. Lower PF means more current is needed for the same real power.

Q3: What's a typical power factor value?
A: Motors typically have 0.8-0.9 PF, resistive loads have 1.0 PF, and heavily inductive loads can be 0.5 or lower.

Q4: How does this differ from single-phase calculation?
A: Single-phase uses I = P×1000/(V×PF) without the √3 factor.

Q5: When would I use 208V vs 480V?
A: 208V is common for smaller commercial buildings, 480V for larger industrial facilities (reduces current for same power).