**Contents**show

## How many amps does a 25 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

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

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 |

## 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 |