Power Calculation

When selecting the correct sized SCR power controller, rate the
SCR for at least 110% of the heater load. Heaters and power lines have
tolerances that can swing on any given day or location.

Single Phase

WATTS ÷ VOLTS = AMPS
 

Example: 18,000W ÷ 240V = 75A
 

AMPS x VOLTS = Watts
 

Example: 60Ax 480V = 28,800W

3-Phase

WATTS ÷ VOLTS ÷ 1.73 = AMPS
     

Example: 18,000W ÷ 240V = 75 ÷ 1.73 = 43.35 A

AMPS x VOLTS x 1.73 = Watts
     

Example: 60A x 480V x 1.73 = 49,824W