Breaker size must be rated for a minimum of 125% of the full-load current of the motor it is protecting, rounded up to the next standard breaker size. For example, the full-load current of a 5 HP motor at 460V is 7.6 Amps. The breaker must be sized for 7.6 * 1.25 = 10 Amps .

## What size breaker do I need for a 10 hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower | Size Breaker | |
---|---|---|

5 | 230V 460V | 15 15 |

7-1/2 | 230V 460V | 40 30 |

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

## How many amps does a 10 hp motor use?

AMP DRAW BASED ON HORSEPOWER

HP | 1 Phase Amps | 3 Phase Amps |
---|---|---|

115 volt | 208 volt | |

5 | 56 | 16.7 |

7-1/2 | 80 | 24.2 |

10 | 100 | 30.8 |

## How many amps does a 10hp single phase motor draw?

Full-Load Current in Amperes Single-Phase Alternating Current Motors

HP | 115V | 230V |
---|---|---|

5 | 56 | 28 |

7-^{1}/2 |
80 | 40 |

10 | 100 |
50 |

The voltages listed are rated motor voltages. The listed currents are for system voltage ranges of 110 to 120 and 220 to 240. |

## 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 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 convert HP to amps?

**Converting horsepower to amps can be done in a few simple steps, or using this simple formula.**

- Amps = (Horsepower × 746) ÷ Efficiency ÷ Volts.
- Watts = Horsepower × 746.
- Watts = Wattsη
- Amps = Watts ÷ Volts.
- Amps = HP × 746V × η × PF.

## How many amps is a 40 hp motor?

AC Motor Full Load Amperes

HP | 200 Volts | 208 Volts |
---|---|---|

40 | 120 |
114 |

50 | 150 | 143 |

60 | 177 | 169 |

75 | 221 | 211 |

## 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.

## How many amps does a 5 horsepower motor draw?

A 5 HP motor at 230V, 3PH is12.

Using the formula above, multiply 12.4 amps by 10% for a result of 1.24. Add this total to 12.4 for a total of **13.64 amps**.

## How much current would a 1.5 HP 240v motor draw?

The 1.5 HP Baldor motor that turns at 1725 will draw **18 amps** according to its name plate.

## What are the standard breaker sizes?

Standard sizes for fuses and fixed trip circuit breakers, per 240.6, are **15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800**, 1000, 1200, 1600, 2000, 2500, 3000, 4000 5000, and 6000 amps.

## How do I know what size breaker I need?

To calculate the breaker size, simply **divide the adjusted wattage by 240 volts to find the rated amperage needed for your subpanel**. Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of the breaker.