Motor rated current also known as full load amperes (FLA) of a motor is the maximum current the motor windings are designed to carry. Here is a simple motor-rated current calculator.

## Motor data input

Motor Type | |

Enter the motor rated voltage | V |

Enter the motor rated power | |

Enter the motor Efficiency | 95% |

Enter the motor Power factor | 0.85 |

## Calculated Values | |

Motor rated current | A |

## How to use the motor-rated current calculator:

The above tool requires the following data for calculation:

- Motor Type – Single-phase or three-phase. (Mandatory)
- Motor-rated power in HP or kW. (Mandatory)
- Input supply voltage. (Mandatory)
- Motor Efficiency as per nameplate – (if known).
- Rated power factor (if known).

After entering the required data, click on the “Calculate” button to find out the required fuse rating, Circuit Breaker rating, contactor current rating, and overload setting.

The appropriate selection of fuses, circuit breakers, overload relays, cables, and other switchgear is necessary to protect the motor from damage. The motor full load current forms the basis for the selection of all this equipment.

## Motor-rated current calculation

### For single-phase AC motors

For single-phase motors, when kW is known:

For single-phase motors, when HP is known:

### For Three-phase AC motors

For three phase motors, when kW is known:

For three phase motors, when HP is known:

Where,

**Voltage:**The phase-to-phase voltage for a 3-phase supply.**Rating:**The power rating of the motor in kW.**Power factor (cosΦ)**: The rated power factor of the motor.**Efficiency (η)**: The efficiency of the motor.

## Single-phase motor rated current reference table:

110V AC | 220V AC | 240V AC | ||

0.07 kW | 1/12 | 2.4 | 1.2 | 1.1 |

0.1 kW | 1/8 | 3.3 | 1.6 | 1.5 |

0.12 kW | 1/6 | 3.8 | 1.9 | 1.7 |

0.18 kW | 1/4 | 4.5 | 2.3 | 2.1 |

0.25 kW | 1/3 | 5.8 | 2.9 | 2.6 |

0.37 kW | 1/2 | 7.9 | 3.9 | 3.6 |

0.56 kW | 3/4 | 11 | 5.5 | 5 |

0.75 kW | 1 | 15 | 7.3 | 6.7 |

1.1 kW | 1.5 | 21 | 10 | 9 |

1.5 kW | 2 | 26 | 13 | 12 |

2.2 kW | 3 | 37 | 19 | 17 |

3 kW | 4 | 49 | 24 | 22 |

3.7 kW | 5 | 54 | 27 | 25 |

4 kW | 5.5 | 60 | 30 | 27 |

5.5 kW | 7.5 | 85 | 41 | 38 |

7.5 kW | 10 | 110 | 55 | 50 |

## Three-phase motor rated current reference table:

kW | HP | 220V AC | 240V AC | 380V AC | 415V AC | 550V AC | 660V AC | 690V AC |

0.1 | 1/8 | 0.32 | 0.30 | 0.19 | 0.17 | 0.13 | 0.11 | 0.10 |

0.18 | ¼ | 0.58 | 0.53 | 0.34 | 0.31 | 0.23 | 0.19 | 0.19 |

0.25 | 1/3 | 0.81 | 0.74 | 0.47 | 0.43 | 0.32 | 0.27 | 0.26 |

0.37 | ½ | 1.19 | 1.10 | 0.69 | 0.63 | 0.48 | 0.40 | 0.38 |

0.56 | ¾ | 1.81 | 1.66 | 1.05 | 0.96 | 0.72 | 0.60 | 0.58 |

0.75 | 1 | 2.42 | 2.22 | 1.40 | 1.28 | 0.97 | 0.81 | 0.77 |

1.1 | 1.40 | 3.55 | 3.26 | 2.06 | 1.88 | 1.42 | 1.18 | 1.13 |

1.5 | 2 | 5 | 4 | 3 | 3 | 2 | 2 | 2 |

2.2 | 3 | 7 | 7 | 4 | 4 | 3 | 2 | 2 |

3 | 4 | 10 | 9 | 6 | 5 | 4 | 3 | 3 |

3.7 | 5 | 12 | 11 | 7 | 6 | 5 | 4 | 4 |

4 | 5 | 13 | 12 | 7 | 7 | 5 | 4 | 4 |

5.5 | 7 | 18 | 16 | 10 | 9 | 7 | 6 | 6 |

7.5 | 10 | 24 | 22 | 14 | 13 | 10 | 8 | 8 |

9.3 | 12 | 30 | 28 | 17 | 16 | 12 | 10 | 10 |

10 | 13 | 32 | 30 | 19 | 17 | 13 | 11 | 10 |

11 | 14 | 36 | 33 | 21 | 19 | 14 | 12 | 11 |

15 | 19 | 48 | 44 | 28 | 26 | 19 | 16 | 15 |

18 | 23 | 58 | 53 | 34 | 31 | 23 | 19 | 19 |

22 | 28 | 71 | 65 | 41 | 38 | 28 | 24 | 23 |

30 | 38 | 97 | 89 | 56 | 51 | 39 | 32 | 31 |

37 | 47 | 119 | 110 | 69 | 63 | 48 | 40 | 38 |

45 | 57 | 145 | 133 | 84 | 77 | 58 | 48 | 46 |

55 | 70 | 178 | 163 | 103 | 94 | 71 | 59 | 57 |

75 | 95 | 242 | 222 | 140 | 128 | 97 | 81 | 77 |

90 | 115 | 291 | 266 | 168 | 154 | 116 | 97 | 93 |

110 | 140 | 355 | 326 | 206 | 188 | 142 | 118 | 113 |

130 | 165 | 420 | 385 | 243 | 223 | 168 | 140 | 134 |

150 | 191 | 484 | 444 | 280 | 257 | 183 | 161 | 154 |

**All the values above are approximated. The actual current may vary depending on the voltage, power factor, and motor efficiency.**

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