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Asynchronous Induction Motors - Electrical Properties

Typical electrical motor data like nominal current, fuse, start ampere, size of contactor and circuit breaker - for asynchronous induction motors.

The table below can used to determine electrical data for asynchronous 380 Voltage induction motors.

380 Voltage 50 Hz motors are commonly used in Europe. Note that the nominal voltage of existing 220/380 V and 240/415 V systems evolves toward the IEC recommended value of 230/400 V.

Asynchronous Induction Motors - Electrical Properties
Rated PowerNominal current
- In -
(A)		Directly Fused
(A)		Star - Delta Started
(A)		Star - Delta contactor
- In -
 (A)		Circuit Breaker
- In -
(A)
kWHP
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, in the branch circuit, and in 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.

Related Topics

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