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

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

Purpose: It helps electricians, engineers, and technicians determine the current draw of three-phase equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula accounts for the three-phase power relationship and power factor.

3. Importance of Current Calculation

Details: Proper current calculation ensures correct wire sizing, circuit breaker selection, and safe operation of electrical systems.

4. Using the Calculator

Tips: Enter the power in kW, line voltage (typically 400V for industrial systems), and power factor (0.8 is common). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between line and phase voltage?
A: Line voltage is between two phases, while phase voltage is between phase and neutral. For 400V line voltage, phase voltage is 230V.

Q2: Why is power factor important?
A: Power factor represents efficiency of power usage. 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, while resistive loads have 1.0 PF.

Q4: How does this differ from single-phase calculation?
A: Single-phase uses \( I = P/V \times PF \) without the \( \sqrt{3} \) factor.

Q5: What if I know the current and want to find power?
A: Rearrange the formula: \( P_{kW} = (I \times V \times PF \times \sqrt{3}) / 1000 \).