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 - I_n - (A)	Directly Fused (A)	Star - Delta Started (A)	Star - Delta contactor - I_n - (A)	Circuit Breaker - I_n - (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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