In this article, we'll explain how protective relays work, review some of the most common relay functions for solar and energy storage systems, and provide best practices for relay programming during project development. Image courtesy Schweitzer Engineering. . Electrical relays, protective devices used to switch power on or off for parts of a circuit, have been integrated into circuits for nearly two hundred years. The first example of a relay dates back to the mid-nineteenth century, when Joseph Henry used a small electric signal to activate an. . ble or when demand for electricity is high. Littelfuse offers solutions with industrial power fuses, arc flash relays, ground fault protection, and surge protective devices. DERs encompass a wide range of decentralized energy sources, such as solar photovoltaic (PV) systems, wind turbines, microgrids. . Relays and switches are essential components in green energy equipment, playing vital roles in controlling, protecting, and managing various systems.
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