How Many Amps Does A 3 Hp Motor Draw

Every bit a "rules of thumb" amps horsepower rating can be estimated to

• 115 volts motor - single-phase : 14 amps/hp
• 230 volts motor - single-phase : 7 amps/hp
• 230 volts motor - 3-phase : ii.five amps/hp
• 460 volts motor - 3-phase : 1.25 amps/hp

E'er cheque nameplate information before designing protective devices, wiring and switch gear.

Single-Stage Motors - HP and Full-Load Currents

A motor of a given rated horsepower is expected to evangelize that quantity of mechanical power at the motor shaft. Be aware that the motor efficiency is not calculated in to the values for kW and amps below. Motor efficiency must exist considered to avert undersized ability supply.

Power		Full Load Current (amp)
(hp)	(kW)	115 Five	208 V	230 5
1/6	0.13	4.iv	2.4	two.2
1/four	0.nineteen	5.8	iii.2	2.9
ane/three	0.25	vii.2	four.0	3.vi
ane/2	0.38	9.8	5.iv	4.9
3/4	0.56	13.8	seven.vi	6.9
1	0.75	16	8.8	8
one i/ii	1.one	xx	11	10
2	i.5	24	13.two	12
iii	2.3	34	xviii.7	17
5	3.viii	56	30.8	28

Note that most electrical motors are designed to run at 50% to 100% of rated load and that maximum efficiency usually is virtually 75% of rated load. For a one horsepower (hp) motor the load should typically be in the range ane/2 to i hp with maximum efficiency at 3/4 hp.

Typical load ranges:

• acceptable for a brusk-flow: twenty - 120%
• acceptable for operating: fifty - 100%
• optimum efficiency: 60 - lxxx%

A motor with a service gene can occasional be overloaded. Overloading will over fourth dimension reduce motor efficiency.

Three-Phase Motors - HP and Total-Load Currents

Ability		Full-Load Electric current (amp)
		Induction Blazon Squirrel-Cage and Wound Motor					Synchronous Blazon Unity Ability Cistron
(hp)	(kW)	115 V	230 V	460 V	575 5	2300 V	230 V	460 V	575 V	2300 V
one/2	0.38	4	2	1	0.8
3/4	0.56	five.6	2.eight	one.4	1.1
one	0.75	7.two	3.6	1.8	1.four
1 one/2	1.1	10.iv	5.2	2.6	2.ane
2	one.five	13.6	6.eight	iii.4	2.7
three	2.3		nine.six	4.8	3.9
5	3.8		15.2	vii.6	6.1
7 1/ii	v.half dozen		22	11	9
10	seven.5		28	14	11
xv	xi		42	21	17
xx	15		54	27	22
25	19		68	34	27		53	26	21
30	23		lxxx	xl	32		63	32	26
xl	30		104	52	41		83	41	33
50	38		130	65	52		104	52	42
60	45		154	77	62	16	123	61	49	12
75	56		192	96	77	20	155	78	62	xv
100	75		248	124	99	26	202	101	81	20

• 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h = 33.000 ft lb/m = ane.0139 metric horse power ~= one.0 KVA

Straight Current Motors - Power and Total Load Currents

Ability		Directly Current (A)
(hp)	(kW)	230 V	440 5
i/4	0.nineteen	0.81	0.42
i/3	0.25	1.one	0.56
i/2	0.37	ane.half dozen	0.85
3/4	0.56	2.4	i.3
i	0.75	3.two	1.7
ane 1/2	1.1	4.nine	two.5
2	1.5	6.5	3.4
three	two.2	9.7	5.1
five	3.7	16	8.5
7 1/two	5.half dozen	24	13
10	7.5	32	17
xv	eleven	49	25
20	fifteen	65	34
30	22	97	51
l	37	162	85
75	56	243	127
100	75	324	170

• for 115V - the amps is twice the amps for 230V

Source: https://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html

Posted by: freemanslingly1956.blogspot.com

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