30 A at 380 V, cosφ 0.9
- Input
- 380 V, 30 A, cosφ 0.9 → P
- Expected output
- 17771 W
√3 × 380 × 30 × 0.9.
Carregando ferramenta… / Loading tool…
three phase power calculator
The tool opens in three-phase at 480 V, cosφ 0.85. Enter the current, power or kVA you have and read the rest, with the formula and the numbers substituted.
√3 × 380 × 30 × 0.9.
√3 × 380 × 30.
10,000 ÷ (√3 × 380 × 0.92).
5,500 ÷ (√3 × 220).
√3 × 480 × 50 × 0.85.
√3 × 400 × 30 × 0.9.
At 220 V, 25 A (5,500 ÷ 220). At 127 V, 43.3 A (5,500 ÷ 127). A heater element is a pure resistance, so the power factor is 1. That figure is the appliance current: it does not say which breaker or wire to use, which is a job for a licensed electrician.
P = √3 × V × I × cosφ, with line-to-line V and line current, for a balanced load.
Because the phase voltages are 120° apart, and the voltage between two lines is √3 times the line-to-neutral voltage.
No. With different loads on each phase, add the power of each phase separately. This tool assumes a balanced load.
Use the voltage that reaches the appliance: line-to-neutral (120 V) or across two lines (240 V). Line-to-line in a three-phase system, 120 V line-to-neutral becomes about 381.1 V.
Typical nameplate powers, only as a starting point. Every model differs: the label on your appliance rules. Edit the value freely.
I = 5,500 ÷ (220 × 1) = 25 A
Running for 1 hour it uses 5.5 kWh.
| Appliance | W | A @ 120 V | A @ 240 V |
|---|---|---|---|
| 5500 | 45.83 | 22.92 | |
| 7500 | 62.5 | 31.25 | |
| 4500 | 37.5 | 18.75 | |
| 1000 | 8.333 | 4.167 | |
| 1300 | 10.83 | 5.417 | |
| 1900 | 15.83 | 7.917 | |
| 1400 | 11.67 | 5.833 | |
| 1500 | 12.5 | 6.25 | |
| 2000 | 16.67 | 8.333 | |
| 1800 | 15 | 7.5 | |
| 1200 | 10 | 5 | |
| 200 | 1.667 | 0.8333 | |
| 9 | 0.075 | 0.0375 |
Current of each appliance at 120 V and 240 V with cosφ 1 (the field above). Motors and compressors often have cosφ below 1: change the field to see the effect.
Limit of this tool. It shows the current and powers implied by the load you enter. It does not size a breaker or a cable: that depends on installation method, length, circuit grouping and temperature, and belongs to a licensed electrician or engineer following your local code.