How many amps is a 40 hp motor?
Mia Smith
Published Mar 14, 2026
How many amps is a 40 hp motor?
AMP DRAW BASED ON HORSEPOWER
| HP | 1 Phase Amps | 3 Phase Amps |
|---|---|---|
| 115 volt | 208 volt | |
| 25 | — | 74.8 |
| 30 | — | 88 |
| 40 | — | 114 |
What is the full load current of a 75 hp 200 V 3 phase motor?
Full-Load Amps: Three-Phase Alternating-Current Motors
| Induction-Type Squirrel Cage and Wound Rotor (Amperes) | ||
|---|---|---|
| HP | 115 Volts | 200 Volts |
| 60 | — | 177 |
| 75 | — | 221 |
| 100 | — | 285 |
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 much current would a 1.5 HP 240v motor draw?
The 1.5 HP Baldor motor that turns at 1725 will draw 18 amps according to its name plate.
How do you calculate phase current?
Phase current I(P) in Amps is equal to line current I(L) in Amps divided by root 3. Example: Calculate the phase current of the delta connected alternator output line current of 1500 Amps. I(P) = 1500 / 1.732 = 866 Amps.
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.
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 |
How many amps does a 100 HP 3 phase motor draw?
AC Motor Full Load Amperes
| HP | 200 Volts | 550-600 Volts |
|---|---|---|
| 60 | 177 | 62 |
| 75 | 221 | 77 |
| 100 | 285 | 99 |
| 125 | 359 | 125 |
How many amps does a 1.5 HP 3 phase motor draw?
AC Motor Full Load Amperes
| HP | 200 Volts | 440-480 Volts |
|---|---|---|
| 3/4 | 3.7 | 1.6 |
| 1 | 4.8 | 2.1 |
| 1.5 | 6.9 | 3.0 |
| 2 | 7.8 | 3.4 |
What is the meaning of 3 phase current?
Three-phase power is a three-wire ac power circuit with each phase ac signal 120 electrical degrees apart. Residential homes are usually served by a single-phase power supply, while commercial and industrial facilities usually use a three-phase supply.
