In the world of electronics and automation, controlling high-voltage devices using low-voltage control systems is a common challenge. This issue is addressed effectively by the Optocoupler Protected Relay Module. This module combines the power of optical isolation with relay technology to provide a safe and efficient solution for controlling high-voltage loads from a low-voltage microcontroller, such as an Arduino or a Raspberry Pi. In this article, we will explore the features, working principle, and applications of the Optocoupler Protected Relay Module, emphasizing its significance in protecting both the low-voltage control circuits and the high-voltage devices.