Threephase kW to Amps calculations involve a ration of 1000 times kW to the power factor times voltage and an additional factor 1.73 that represents an equivalent of √3 and is Thisheater is designated the “FHLB9KW” and the specification is as follows –. The FHLB9KW Stainless Steel Industrial Electric Heater, IP54 Rated, 3 Phase 400 volts. Output in (kW): 1.8 kW / 5.4 kW / 9 kW. Adjustable thermostatic control. Mains voltage – (V): 3 Phase x 400 volts. Foreasier explanation, let us review the example below: We have a circuit with 25kW three-phase power generator, 80% efficiency (0.8 PF) at 240volts. The amps will be: amps = Forthree 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: Whenthe power factor is 1.0 (unity) or 100%, the phase angle between the current and the voltage will be 0° because cos⁻¹(1.0) = 0°. When the power factor equals zero (0), the phase angle is 90° due to the formula cos⁻¹(0) = 90°. The higher the power factor, the more efficient the system will be. Supposeyou plan to install a 5 kW air conditioner with a voltage of 220 V (single-phase AC) and a PF of 0.9. Plug these values into the formula: A m p s ( A) = 1000 × 5 k W 220 V × singlephase motors, and engineers should, whenever possible, determine the actual full load current load current from the motor rating plate. Single Phase Motors MOTOR RATING Approx. Full Load Current at Line Voltage kW HP 110V ac 220V ac 240V ac 0.07 1/12 2.4 1.2 1.1 0.37 1/2 7.9 3.9 3.6 0.56 3/4 11 5.5 5 0.75 1 15 7.3 6.7 1.1 1.5 21 Themeasurement unit for current is Amperes often used as amps. Formulas to calculate 3 phase AC induction motor starting, running & full-load current. More Resources. More Expert Resources; average of first 50 numbers; 1/2 divided by 1/3; 6C3: 6 choose 3; 30 days after today; LCM of 10 and 15; AyKw.