Motor 3 Phase 0.75 kW

Current Formula:

\[ I = \frac{0.75 \times 1000}{V \times PF \times \sqrt{3}} \]

Current (amps):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a 3-Phase Motor Current Calculator?

Definition: This calculator estimates the current drawn by a 0.75 kW three-phase motor based on supply voltage and power factor.

Purpose: It helps electricians and engineers determine motor current for proper circuit sizing and protection.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ I = \frac{0.75 \times 1000}{V \times PF \times \sqrt{3}} \]

Where:

\( I \) — Current (amps)
\( V \) — Voltage (volts)
\( PF \) — Power factor (0-1)

Explanation: The 0.75 kW power is converted to watts (750W), then divided by the product of voltage, power factor, and √3 (1.732) for three-phase systems.

3. Importance of Motor Current Calculation

Details: Proper current estimation ensures correct wire sizing, circuit breaker selection, and prevents electrical hazards.

4. Using the Calculator

Tips: Enter the supply voltage (default 400V) and power factor (default 0.9). Typical power factors range from 0.8-0.95 for motors.

5. Frequently Asked Questions (FAQ)

Q1: Why √3 in the formula?
A: The √3 accounts for the phase difference in three-phase power systems.

Q2: What's a typical power factor for motors?
A: Most motors have PF between 0.8-0.95 when operating at full load.

Q3: How does voltage affect current?
A: Higher voltage means lower current for the same power (inverse relationship).

Q4: Can I use this for other motor sizes?
A: This is specific to 0.75 kW motors. For other sizes, adjust the numerator (0.75 × 1000).

Q5: What if my motor is single-phase?
A: Single-phase motors use a different formula without the √3 factor.