**Contents**show

## What size breaker do I need for a 40 hp motor?

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

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

20 | 230 V 460 V | 100 50 |

25 | 230 V 460 V | 100 50 |

30 | 230 V 460 V | 125 70 |

40 | 230 V 460 V | 175 100 |

## How do you convert HP to amps?

**How to Convert Horsepower to Amps**

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

## 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 |

## What wire do you use for 20 amps?

A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by **12-gauge or 10-gauge wire**.

## How many HP is 15 amps?

Common Amps to Horsepower Conversions

Amps | Horsepower | Efficiency |
---|---|---|

15 A | 2.17 HP |
90% |

20 A | 2.9 HP | 90% |

25 A | 3.62 HP | 90% |

30 A | 4.34 HP | 90% |

## How many amps is 60 horsepower?

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 |
---|---|---|

60 | 149 |
75 |

75 | 180 | 90 |

100 | 245 | 123 |

125 | 310 | 155 |

## Will 6 gauge wire fit in a 30 amp breaker?

RULES OF THUMB

“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and **6-gauge is good for 55 amps**,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”

## 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. |