It is a 12-0-12 center tapped step-down transformer, i.e. it can take standard AC mains voltage of 220V AC and One of the most important machines that literally transformed the whole Electrical Power Industry is the Transformer. It is an electrical machine which with great efficiency changes the voltage level so that the power can be transferred to very long distances without much loss. 12-0-12V, 500mA Centre-Tapped Step Down Transformer is a general-purpose chassis mounting mains transformer. Transformer has 230V primary winding and center-tapped secondary winding. The Transformer act as a step-down transformer reducing 230VAC RMS to 12VAC RMS. It can be used in Small rectifier circuits to charge a 12V battery, Power small devices with low voltage ratings like Arduino, PIC, AVR, and Raspberry Pi and other controllers, it can also be used to charge mobile phones, etc. You can also check out other transformers on our website, for different current and voltage ratings.