**Contents**show

## What size breaker do I need for a 20 hp motor?

Full Load Current: Three Phase AC Motors

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

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

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

20 | 230V 460V | 100 50 |

## How do you size a circuit breaker for a motor?

You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52].

## How many amps should you run on a 20-amp breaker?

An important note to remember is that circuit breakers can only handle about 80% of their overall amperage. That means a 15-amp circuit breaker can handle around 12-amps and a 20-amp circuit breaker can handle about 16 amps.

## What size breaker do I need for a 21 amp motor?

How to Calculate How What Size Circuit Breaker a Machine will Need:

HorsePower of Main Motor | 220 Volts, 1 phase | 440 Volts, 3 phase |
---|---|---|

10 | 56 | 14 |

15 | 84 | 21 |

20 | 112 | 28 |

25 | 140 | 35 |

## How many amps does a 20hp motor draw?

AC Motor Full Load Amperes

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

20 | 62.1 | 59.4 |

25 | 78.2 | 74.8 |

30 | 92 | 88 |

40 | 120 | 114 |

## How many amps does a 20 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

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

115 volt | 208 volt | |

10 | 100 | 30.8 |

15 | — | 46.2 |

20 | — | 59.4 |

## How do I choose a motor breaker?

How to choose a motor circuit breaker?

- Long delay current setting value—motor rated current.
- Instantaneous setting current. …
- The returnable time of the 6 times long delay current setting value ≥ the actual starting time of the motor.

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

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

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

25 | 230 V 460 V | 100 50 |

30 | 230 V 460 V | 125 70 |

40 | 230 V 460 V | 175 100 |

50 | 230 V 460 V | 200 150 |

## What type of circuit breaker does a motor use?

The motor protection circuit breaker can be considered a subtype of a thermal magnetic circuit breaker, but with additional functions that are specially designed to protect electric motors. The basic working principle is similar to all other circuit breakers.

## How far can you run a 20 amp circuit?

You can run a 10 gauge wire up to 85 feet on a 20 amp circuit. If you opt to use this type of wire on a 15 amp circuit, it can run up to 115 feet. After these distances, the circuit will go over the recommended 3% voltage drop.

## How many devices can be on a 20 amp circuit?

Devices on a 20 Amp Circuit

Because not all the outlets will be used (drawing power). However, they do put a limit on the maximum power load a circuit and its breaker should carry – no more than 80% of its rating. This means a 20 amp circuit should only carry 16 amps at maximum – or about ten devices.

## What size breaker should I use?

The general rule of thumb is that circuit breaker size should be 125% of the ampacity of cable and wire or the circuit which has to be protected by the CB. Let see the following solved examples: Example 1: Suppose, a 12 gauge wire is used for 20 amperes lighting circuit having 120V single phase supply.

## What size breaker do I need for a 230 volt well pump?

Most submersible well pumps are 230 volts and require a 2 pole circuit breaker (2 individual circuit breakers connected together).

## How many amps does a 2 hp motor pull?

Common Horsepower to Amps Conversions

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

1.25 HP | 8.63 A | 120 V |

1.5 HP | 10.4 A | 120 V |

1.75 HP | 12.1 A | 120 V |

2 HP | 13.8 A | 120 V |

## What size breaker do I need for a 15 amp motor?

A 12 wire and a 20A breaker is needed. 15A ends can be used on 20A circuits.