1. What is a kW to 3 Phase Amps Calculator?

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

Purpose: It helps electricians and engineers determine the current draw of three-phase electrical equipment based on power rating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amps)
• \( P_{kW} \) — Power (kilowatts)
• \( V \) — Voltage (volts)
• \( PF \) — Power factor (0-1)

Explanation: The formula converts kW to watts (×1000), then divides by the product of voltage, power factor, and √3 (1.732) for three-phase systems.

3. Importance of Current Calculation

Details: Proper current calculation ensures correct wire sizing, circuit breaker selection, and prevents electrical system overloads.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is √3 used in the formula?
A: The √3 factor accounts for the phase difference in three-phase systems (120° between phases).

Q2: What's a typical power factor value?
A: Motors typically have 0.85 PF, resistive loads 1.0, and poor PF loads may be 0.6-0.7.

Q3: Does this work for single-phase systems?
A: No, for single-phase use the formula without √3: I = (P × 1000)/(V × PF).

Q4: What voltage should I use?
A: Common three-phase voltages are 208V, 240V, 480V, or 600V depending on your system.

Q5: How accurate is this calculation?
A: It provides theoretical values; actual current may vary due to efficiency losses and other factors.