**Contents**show

## What size breaker do I need for A 7.5 hp motor?

What size breaker do I need for a 7.5 hp motor? Re: Wire and breaker size for 7.5 hp motor You need **50 amp rated wire with a 50-100 amp breaker**.

## How many amps does A 7.5 HP 3 phase motor draw?

AC Motor Full Load Amperes

HP | 200 Volts | 440-480 Volts |
---|---|---|

3 | 11 | 4.8 |

5 | 17.5 | 7.6 |

7.5 | 25.3 |
11 |

10 | 32.2 | 14 |

## What size breaker do I need for A 3 phase 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 |

## What size wire do I need for a 30 hp motor?

Electrical motor wiring data – NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

Motor HP | NEMA amps | Phase Wires (AWG) |
---|---|---|

25 | 34 | 6 |

30 |
40 |
6 |

40 | 52 | 4 |

50 | 65 | 4 |

## What size breaker do I need for a 50 hp motor?

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

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

40 | 230 V 460 V | 175 100 |

50 | 230 V 460 V | 200 150 |

60 | 230 V 460 V | 250 200 |

75 | 230 V 460 V | 300 200 |

## How many amps does a 7 and 1/2 horsepower motor pull?

AMP DRAW BASED ON HORSEPOWER

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

115 volt | 230 volt | |

7-1/2 | 80 | 22 |

10 | 100 | 28 |

15 | — | 42 |

## How many amps is 3 horsepower?

Common Horsepower to Amps Conversions

Horsepower | Amps | Voltage |
---|---|---|

3 HP | 20.7 A |
120 V |

3.5 HP | 24.2 A | 120 V |

4 HP | 27.6 A | 120 V |

4.5 HP | 31.1 A | 120 V |

## What is the formula to convert HP to amps?

Knowing that we can write hp to amps formula for direct current (DC) as: **I = P * 746 / (V * η) .**

## How many amps does an air compressor pull?

The compressor, if designed for 240 volts, will have a running current draw of **23.23 amps**. You cannot size a breaker up to this number, however. Other factors play into the sizing. First, at start-up most motors draw more power than at running.

## How much power does a 7.5 hp motor use?

How much power does a 7.5 hp motor consume? Let us assume that motor is operating at full load so it will consume 7.5 hp or 5.59 or 5.6 kW approx. Let us assume motor has efficiency of 90 %, motor at full load gives around 90 % efficiency, so the power input to motor is 5.6/0.9=**6.22 kW**.

## How many amps does a 220 air compressor use?

Heavy-duty compressors operate on 220-volt current and require special wiring and outlets. A 110-volt compressor drawing **15 amps** uses 1,650 watts (110 volts x 15 amps), while a 220-volt compressor drawing 15 amps consumes 3,300 watts (220 volts x 15 amps).

## How do you size a 3 phase 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 4 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.