IEC 61811 focuses on electronic relays, specifically those utilized in automation and control circuits. These devices are integral to electrical systems because they allow a low power signal to control a larger power circuit, which is vital for protecting and managing electrical loads. The standard outlines the requirements for electromechanical and solid-state relays that are intended for use in applications such as industrial control, power protection, and automation systems.

    A relay is essentially an electromechanical or solid-state device that can switch an electrical circuit on or off based on a control signal. The IEC 61811 standard ensures that these relays meet specific performance, safety, and environmental standards, which is critical for ensuring their reliable operation in various industrial environments.