The 110 Vdc DC system at the substation plays a crucial role as a power source for protection systems, relays, SCADA, and control systems. Disturbances such as voltage drops or ground imbalances can cause protection failures and reduce system reliability. Therefore, a monitoring system capable of monitoring voltage conditions in real time is required to detect disturbances early. This study aims to analyze the installation, operation, accuracy, and effectiveness of IoT-based DC Clip Monitoring in the Baturaja ULTG work area.The research method used was an experiment with a quantitative approach through measuring and comparing DC voltage data between DC Clip Monitoring readings and standard multimeters at five substations: Baturaja Substation, Martapura Substation, Muara Dua Substation, Bukit Asam Substation, and Blambangan Umpu Substation. The analysis was conducted by calculating the error percentage to determine the accuracy of the instrument.The results showed that the average error rate for DC Clip Monitoring measurements was 3.78%, well within the tolerance limit for DC system monitoring (±5%). The Blambangan Umpu Substation had the lowest error rate at 0.97%, while the Martapura and Muara Dua Substations showed errors of around 6%. Overall, the system displayed real-time voltage data and was effective in assisting in the early detection of disturbances, including voltage imbalances with respect to ground.Based on these results, it can be concluded that the installation of DC Clip Monitoring at the Baturaja ULTG is effective and suitable for use as a monitoring and early warning system to improve the reliability and safety of the DC system at the substation.