Specified relays are electromechanical or solid-state devices that are engineered to perform designated switching functions within electrical circuits under specific operating conditions. These relays are tailored for particular applications where precision, reliability, and predefined performance criteria are critical. Common types include overload relays, time-delay relays, and safety relays, each designed to respond to particular triggers like voltage levels, current thresholds, or time intervals. Their main purpose is to protect electrical equipment and ensure system functionality by interrupting or redirecting current flow as required.