The Elta 149-ACO18B auto changeover panel is designed to control AC and EC single or three-phase twin fans, ensuring reliable operation with automatic changeover if a fan fails. This controller supports run and standby modes, providing seamless fan failover to maintain system performance. It features a duty share option for balanced fan usage, a remote enable function for external control, and a VFC fail contact option for monitoring fan status. This panel is ideal for applications requiring dependable fan redundancy and efficient operation management.