What size breaker do I need for a 3 HP motor?

Motor Horsepower Size Breaker
1-1/2 230V 460V 15 15
2 230V 460V 15 15
3 230V 460V 15 15
5 230V 460V 15 15

How many amps does a 3 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
3 34 10.6
5 56 16.7
7-1/2 80 24.2

What size breaker do I need for a 4 hp motor?

How to Calculate How What Size Circuit Breaker a Machine will Need:

HorsePower of Main Motor 220 Volts, 1 phase 220 Volts, 3 phase
1 Hp 5.6 Amps 2.8
2 11.2 5.6
3 16.8 8.4
4 22.4 11.2

How many amps does a 3 hp 480 volt motor draw?

AC Motor Full Load Amperes

HP 200 Volts 440-480 Volts
2 7.8 3.4
3 11 4.8
5 17.5 7.6
7.5 25.3 11

How do I convert HP to amps?

How to use the hp to amps calculator?

  1. Estimate the power in watts (the nominator of the expression), 1 hp * 746 = 746 W ;
  2. Evaluate the product in the denominator, 200 V * 0.92 * 90% = 165.6 V . …
  3. Make a fraction of these numbers and find the final horsepower to amps value, 746 / 165.6 = 4.505 A .
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How many amps does a 5 HP 3 phase motor draw?

These are only intended to be guidelines and in all cases the full load amps of the motor nameplate should be used for final calculations.

Here are the Full Load Amp (FLA) values for typical 230VAC and 480VAC 3 phase motors.

Motor horsepower Full load amps 230VAC Full load amps 460VAC
3 9 4.5
5 15 7.5
7.5 22 11
10 27 14

How do I choose a cable size for a motor?

Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. Example: what is the minimum rating in amperes for Cables supplying 1 No of 5 hp, 415-volt, 3-phase motor at 0.8 Power Factor. Full-load currents for 5 hp = 7Amp. Min Capacity of Cable= (7X125%) =8.75 Amp.

What size wire do I need for a 50 hp motor?

Electrical motor wiring data – NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

Motor HP NEMA amps Phase Wires (AWG)
40 52 4
50 65 4
60 77 2
75 96 2

What size breaker do I need for a 7.5 hp motor?

You need 50 amp rated wire with a 50-100 amp breaker. 7.5hp=40 amps x 250%=100 amp breaker on #8 Thhn. If a 100amp breaker isn’t sufficient to start the motor without tripping I can then go up to a maximum of 400% of the motor rating.

What size breaker do I need for a 5 hp motor?

A 5hp single phase AC motor has a load current of 28 Amps. So 10GA. wire with a 30 Amp breaker will work.

What size breaker do I need for a 15 hp motor?

Full Load Current: Three Phase AC Motors

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Motor Horsepower Size Breaker
7-1/2 230V 460V 40 30
10 230V 460V 50 30
15 230V 460V 70 40
20 230V 460V 100 50

What size breaker do I need for a 1.5 hp motor?

Assuming that it is single phase, a 15 ampere circuit breaker should be adequate and will allow extra current for starting and surges.

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