Convert kW to Amps 3 Phase Calculator

3-Phase Current Formula:

\[ I = \frac{P_{kW} \times 1000}{V \times PF \times \sqrt{3}} \]

Current (I): amps

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1. What is a kW to Amps 3-Phase 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 electrical equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ I = \frac{P_{kW} \times 1000}{V \times PF \times \sqrt{3}} \]

Where:

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

Explanation: The formula accounts for the three-phase power relationship and converts kW to watts (×1000) before calculation.

3. Importance of Current Calculation

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

4. Using the Calculator

Tips: Enter the power in kW, system voltage (default 400V), and power factor (default 0.8). All values must be > 0 (PF between 0.01 and 1).

5. Frequently Asked Questions (FAQ)

Q1: Why is the power factor important?
A: Power factor represents efficiency of power usage. Lower PF means more current is needed for the same real power.

Q2: What's a typical power factor value?
A: Motors typically have PF of 0.8-0.9, while resistive loads have PF of 1.0.

Q3: What voltage should I use?
A: Common three-phase voltages are 208V, 400V, 480V. Check your equipment specifications.

Q4: Can I use this for single-phase systems?
A: No, use a different formula (I = P×1000 / V×PF) for single-phase systems.

Q5: How does this relate to circuit breaker sizing?
A: Breakers should be sized at 125% of calculated current for continuous loads (>3 hours).