Variac is a variable transformer and a great device for quality control testing, equipment testing on low and high voltage, control over heat, speed, and more. For example, if your device requires 5 amp, buy the variac with up to 10 amp. A rating of 500VA means that at 100volt, the unit can sustain at maximum 5amp. If at 120 volt the unit can sustain at 4. 1ampNote - Indoor use only. Do not operate in a condition that may cause electrocution and fire. Do not operate in a wet environment. Do not operate near flammable substance. Model # 16VA520TO5 Features: Input: 120 volt AC, Output: 0130 volt AC, 5 amp slow blow fuse VA: 500VA, 5 Amp. Max (surge) A rating of 500VA means that at 100volt, the unit can sustain at maximum 5amp. If at 120 volt the unit can sustain at 4. 1amp Note that most device have surge (when first turn on) much higher than operating amp rating E. g. , motor with 5 amp rating may have over 10 amp surge, and you will need 10 amp variac.
