Asynchronous Motors - Electrical Data
Electrical motor data - nominal current, fuse, start ampere, contactor and circuit breaker of asynchronous motors
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The table below can used to determine electrical data for common asynchronous 380 Voltage motors.
| KW | HP | Nominal current - In - (A) |
Directly Fused (A) |
Star - Delta Started (A) |
Star - Delta contactor - In - (A) |
Circuit Breaker - In - (A) |
| 0.2 | 0.3 | 0.7 | 2 | 2 | 16 | |
| 0.33 | 0.5 | 1.1 | 2 | 2 | 16 | |
| 0.5 | 0.7 | 1.4 | 2 | 2 | 16 | |
| 0.8 | 1.1 | 2.1 | 4 | 4 | 16 | |
| 1.1 | 1.5 | 2.6 | 4 | 4 | 16 | |
| 1.5 | 2 | 3.6 | 6 | 4 | (16)22 | 16 |
| 2.2 | 3 | 5.0 | 10 | 6 | (16)22 | 16 |
| 3 | 4 | 6.6 | 16 | 10 | (16)22 | 16 |
| 4 | 5.5 | 8.5 | 20 | 16 | (16)22 | 16 |
| 5.5 | 7.5 | 11.5 | 25 | 20 | (16)22 | 16 |
| 7.5 | 10 | 15.5 | 35 | 25 | (25)22 | 25 |
| 11 | 15 | 22.2 | 35 | 35 | (40)30 | 40 |
| 15 | 20 | 30 | 50 | 35 | (40)30 | 40 |
| 22 | 30 | 44 | 63 | 50 | (63)/60 | 60 |
| 30 | 40 | 57 | 80 | 63 | (63)/60 | 60 |
| 45 | 66 | 85 | 125 | 100 | 90 | 100 |
| 55 | 75 | 104 | 160 | 125 | 110 | 100 |
| 75 | 100 | 140 | 200 | 160 | 150 | 200 |
| 90 | 125 | 168 | 225 | 200 | 220 | 200 |
| 110 | 150 | 205 | 300 | 250 | 220 | 200 |
| 132 | 180 | 245 | 400 | 300 | 300 | 400 |
| 160 | 220 | 290 | 430 | 300 | 300 | 400 |
| 200 | 270 | 360 | 500 | 430 | 480 | 400 |
| 240 | 325 | 430 | 630 | 500 | 480 | 480 |
Full-voltage, single-speed motor starters
Full-voltage starters (manual and magnetic) apply full voltage directly to motor terminals.
Reduced-voltage, single-speed motor starters
Some machines or loads may require a gentle start and smooth acceleration up to full speed.
Many starters apply reduced voltage to motor windings; primary resistor, primary reactor, autotransformer, and solid state. Part winding and wye-delta starters can also provide reduced-voltage starting, although technically they are not reduced-voltage starters.
Motor Protection
Motors should have protection for themselves, the branch circuit, and the feeder line. Protection, provided by fuses and circuit breakers, guards against fault conditions caused by short circuits or grounds and over currents exceeding locked-rotor values.
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Related Topics
- Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units
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