**Contents**show

## How many amps does a 100 hp motor draw?

AC Motor Full Load Amperes

HP | 200 Volts | 220-240 Volts |
---|---|---|

75 | 221 | 192 |

100 | 285 | 248 |

125 | 359 | 312 |

150 | 414 | 360 |

## What size breaker do I need for a 100 hp motor?

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

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

75 | 230 V 460 V | 300 200 |

100 | 230 V 460 V | 400 200 |

125 | 230 V 460 V | 500 250 |

150 | 230 V 460 V | 600 300 |

## 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 |

## What is full load current of 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. Here power factor will be unity for resistive loads. Full load current I, I =P.

## 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 many amps does a 7.5 kW 3 phase motor draw?

Three Phase Motors

MOTOR RATING | HP | |
---|---|---|

4.0 kW | 5.5 | 8 |

5.5 kW | 7.5 | 11 |

7.5 kW | 10 | 15 |

9.3 kW | 12.5 | 18 |

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

For AC, 3 phase supply (400 /440 Volts) the rating of Breaker will be 6 Amps, 3 Pole or 4 Pole.

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

A 3 HP will be about 18amps. the circuit breaker for the 13 amps should be 20 amps. For the 3 HP the breaker should be 30 amps .

## Does Square D make a 25 amp breaker?

Square D QO 25-Amp 1-Pole Standard Trip Circuit Breaker.

## Is 3 phase motor current per phase?

The above deals with balanced three phase systems. That is the current in each phase is the same and each phase delivers or consumes the same amount of power. This is typical of power transmission systems, electrical motors and similar types of equipment.

## How do you find the amperage of a motor?

The motor FLA calculator uses the following formulas:

- Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)
- Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)
- Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)

## How do you calculate HP full load 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 much current does a motor draw?

Calculate the amps used by dividing the wattage by the voltage. For example a 500-watt motor — running on 50 volts — will draw 10 amps. A motor with the same wattage — running on 20 volts — will use 25 amps. This is the theoretical number of amps used by the motor.