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kVA - The kVA, or Kilovolt-ampere, output rating designates the output which a transformer can deliver for a specified time at rated secondary voltage and rate frequency without exceeding the specified temperature rise (1 kVA = 1000 VA).

Kvar - A term used to express the power rating of a capacitor. KiloVolt Ampere Reactance, expressed by the following formula...

• Kvar = [2 x pi x f x c x kV x kV]/1000
  where...
  pi = 3.14159
  f = frequency (hertz)
  c = capacitance (in microfarads)
  kV = kilovolt

kW - Kilowatts. Real power delivered to a load (W x 1,000 VA).