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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

÷
÷
=
Amps

Example: 18,000W ÷ 240V = 75A

×
×
=
Watts

Example: 60A ⨯ 480V = 28,800W

3-Phase

÷
÷
÷
÷
1.73
=
Amps

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

×
×
×
×
1.73
=
Watts

Example: 60A ⨯ 480V ⨯ 1.73 = 49,824W

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