The QLT Power SSR-25048RD3B is a solid state relay with a control voltage of 3 to 32VDC, rated for up to 250A and an operating voltage range of 44 to 480VAC. It is part of their SSR-R Series, and features instantaneous turn-on, ultra-low noise, no electromagnetic interference, and high noise-immunity. The robust built-in heat sink helps protect the SSR from excessive thermal stress and makes it suitable for rugged industrial applications. It is UL, CSA, and CE certified, and is designed to provide reliable service with minimal maintenance.