Abstract: - Transformers are a vital component of the transmission of electricity. ON-load tap dynamic electrical devices are critical in today's power grid since they enable voltages to be sustained at predetermined levels during load changes. As a result, the aim of this project is to develop an IoT-controlled electrical interface tap changer as well as dominant industrial equipments. In this project, the user can choose the tap of transformers such as 5 volts, 9 volts, 12 volts, and 18 volts from the IOT tab. As a result, we will construct the majority of access points to the electrical interface for many applications to handle at the same time.Keyword: - ON-load tap-changing transformer; Arduino; Relays; IOT; Power supply.