A voltage transformer is used to convert the electrical output of a power source to match the voltage of your device, that is, to convert 110 volt to 220/240 Volt OR convert 220/240 V to 110/120 Volt. A Step Up transformer is needed when you want to use a 220 volt foreign appliance in USA with 110v. A Step Down transformer is needed when you want to use a 110V appliance in a 220V Country. 

We produce a wide range of 110 Volt and 220 Volt Step up and step down voltage converter transformers. Our Step Up Down transformers are reversible and can be used worldwide with 110v-240v and 50Hz or 60 Hz. Also called power converters, most of our transformers come with Universal outlets that can accept plugs from most foreign countries.