<![CDATA[Qomarul Nur Wahid 1), Priyo Sasmoko 2), ABSTRACT ATS is an electronic circuit that is used to operate the transfer of voltage sources from PLN sources to generators and vice versa. With the current distribution of electricity in society, many people have generators as backup electrical energy if PLN goes out. In this ATS there is an ESP32 microcontroller which is used as a controller for the entire ATS circuit system. The SSR-25DA relay is a switch to move sources from PLN-Genset or from PLN-Genset. To control the SSR-25DA relay, the BD139 transistor is used. The 1N4004 diode is used as a safety device when the SSR-25DA relay is switched for source switching, the 100nF capacitor is a filter to stabilize the signal to the SSR-25DA relay when the source is switched. To monitor voltage parameters on the ATS, the PZEM-004T sensor module is used. The ATS design is also equipped with Undervoltage and Overvoltage which functions as a protection system to protect when disturbances occur with an Undervoltage tolerance of -10% and Overvoltage of +5% of the standard voltage of 220 Volts. The way the system works is by reading the voltage parameters by the PZEM-004T sensor module and then processing the data by the ESP32 Microcontroller by activating the buzzer which is used as a marker when the voltage is below the SPLN Undervoltage voltage tolerance limit of 198 Volts and above the SPLN Overvoltage voltage tolerance limit of 231 Volts.]]>
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