⭐ Screw compressor Motor Current & Overload Relay & Contractor Selection
⚡ ampere‑based sizing · choose FLA input method
Typical screw compressor: 30–200 A
⚠️ Please fill all fields with valid positive numbers
📋 Standard IEC contactor ratings (AC‑3) are suggested. Overload range covers FLA.
How to Use This Calculator
Method 1: Enter motor FLA directly if known
Method 2: Calculate FLA from motor specifications (power, voltage, efficiency, power factor)
What This Calculator Provides
- Motor Full Load Ampere (FLA)
- Main contactor rating
- Delta contactor rating
- Star contactor rating
- Overload relay range
Understanding the Results
All recommendations follow IEC AC-3 standard contactor ratings for motor control applications. The overload relay should be set to the motor’s FLA value within the specified range.