IEC 61811 refers to a set of international standards for the design, construction, and operation of relays, specifically addressing both electromechanical and solid-state types. These relays are typically used in industrial and electrical applications to control the flow of electricity and provide safety by switching circuits on or off based on pre-defined conditions. IEC 61811 standards focus on ensuring that the relays perform effectively under various operational conditions while maintaining safety, reliability, and durability.

    The standard primarily aims to ensure that relays are designed to handle the mechanical and electrical stresses of automation systems. IEC 61811 covers aspects such as temperature range, vibration resistance, insulation properties, and lifespan. This makes it an essential reference for manufacturers and engineers working with relays in automation environments.