DC electrical devices are components specifically designed to operate with direct current (DC) electricity, where the flow of electric charge is unidirectional. These devices include items like DC circuit breakers, DC relays, DC motors, and DC power supplies, all of which are engineered to handle the unique characteristics of DC power, such as constant voltage levels and steady current. They are commonly used in applications like battery-powered systems, renewable energy installations, and electronic circuits, where stable and reliable DC power is essential for proper functioning and efficiency.