What size breaker do I need for a 25 hp motor?

How many amps does a 25 hp motor draw?


HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
15 46.2
20 59.4
25 74.8

Will a 100a circuit breaker be sufficient for a 25 hp three phase 230V motor?

you will need 100 amp breaker on this motour due the inrush current during start up. { and yes NEC code allow up to 250% oversized for short circuit protection and limited protection on the motour. }

How do you size a circuit breaker for a motor?

You must size the conductors at 125% of the motor FLC [430.22(A)]. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)].

What size breaker do I need for a 30 hp motor?

Full-Load Current and Circuit Protection Data for Three-Phase AC Motors

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Motor Horsepower Breaker Size
25 230 V 460 V 100 50
30 230 V 460 V 125 70
40 230 V 460 V 175 100
50 230 V 460 V 200 150

How much power does a 25 hp electric motor use?

Re: Cost to operate a 25 HP Motor…

25 horsepower is about 18.6 KW, so that’d be $1.49 an hour.

How many amps does a 25 hp motor draw at 480 volts?

AC Motor Full Load Amperes

HP 200 Volts 440-480 Volts
25 78.2 34
30 92 40
40 120 52
50 150 65

What size breaker do I need for A 200 hp motor?

So, assuming an inverse time breaker, the 200 hp motor would have a maximum branch circuit OCPD of 240 amps x 250% = 600 amp.

How do you size A 3 phase circuit breaker?

For 3-phase loads, you divide the VA by the nominal voltage and by the square root of three (approximately 1.732). If your total 3-phase load in a 480V system is 50,000VA, what size breaker do you need? 50,000VA ÷ (480V × 1.732) = 60.2A. The next size up is 70A.

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 1 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
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How do I size a motor overload?

The overloads are determined using 125% of the FLA, 7A x 1.25 = 8.75A. The maximum allowable size for the overloads is 9.8A. The overloads can be sized at 140% of the FLA if the overloads trip at rated load or will not allow the motor to start, 7A x 1.4 = 9.8A.

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 10hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower Size Breaker
3 230V 460V 15 15
5 230V 460V 15 15
7-1/2 230V 460V 40 30
10 230V 460V 50 30