The DJNR6045-680-S is a Ferrocore part made by the company TDK. It is an EMI filter that is used to reduce noise interference in electronic systems. The filter has 680VMaximum AC input voltage, 4.5A maximum AC current, 600V maximum DC voltage, and 4.5A maximum DC current. It also features an open mode surge protection up to 1000V per minute at 1A and common-mode surge protection up to 1,500V at 0.2A. The filter is made to help reduce the susceptibility of noise interference in all sorts of electrical systems, such as Power Supplies, Monitors, Modems, routers, and other electronic equipment.