Center Tap Transformer

The difference between a regular transformer and a center-tap transformer is that a center-tap transformer allows you to tap into half of the voltage. In our example, both step-down transformers have a turn ratio of 10:1, meaning the output voltage will be 10 times smaller than the input voltage. 1st Example: Input voltage = 340VAC = 240Vrms Output voltage = 24Vrms 2nd Example: Input voltage = 340VAC = 240Vrms Output voltage = 24Vrms Center-tap voltage = 12Vrms The center tap transformer allows us to tap into half of 24V which is 12V.