**Contents**show

## How much current does a 3 phase motor draw?

Full Load Current: Three Phase AC Motors

Motor Horsepower | Motor Ampere | |
---|---|---|

1 | 230V 460 V | 4.2 2.1 |

1-1/2 | 230V 460V | 6.0 3.0 |

2 | 230V 460V | 6.8 3.4 |

3 | 230V 460V |
9.6 4.8 |

## How many amps does a 1/3 hp motor draw at 120 volts?

AC Motor Full Load Amperes

HP | 110-120 Volts | |
---|---|---|

1/8 | 3.8 | 1.9 |

1/6 | 4.4 | 2.2 |

1/4 | 5.8 | 2.9 |

1/3 | 7.2 |
3.6 |

## How do you calculate amps in a 3 phase circuit?

Divide the power consumption in watts by the line voltage multiplied by the power factor to find the amperage. For three phase circuits the power factor is **the square root of 3**. If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3.

## How do you calculate full load amps on a 3 phase motor?

For three-phase, full load current for the resistive load is **equal to the three-phase power divided by 1.732 times of voltage**.

## 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% |

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

What size breaker do I need for a 3 HP motor? **A 20 amp breaker** is all you’d ever need for a 220v 3HP motor. It wouldn’t hurt anything to run 30amp circuits if you so choose, but it’s overkill.

## How many amps does a 3 hp submersible pump draw?

Re: Amp draw on a 3/4HP pump

Running amps will be **6 to 8 amps**.