The 78ARCSX-30 is a 30-volt AC relay by Schneider Electric. It is designed for use in construction and other industries for various applications, such as switching circuits, controlling motors, lighting, and other electronic devices. It has a high-performance design, with a self-extinguishing powder-coated steel housing, SPDT double-break contacts, a maximum contact load of 20A, and a maximum switching current of 10A. It includes LED indicators and has a mechanical life of up to 10 million operations.