The CAP CER 330PF 6KV X7R 1808 is a specific type of ceramic capacitor. It has a capacitance value of 330 pF and an operating voltage rating of 6000V (6kV). This component falls under the X7R classification, which is a common designation for certain types of ceramic capacitors, particularly those with high dielectric constants. The '1808' or '4520 Metric' refer to its physical dimensions in metric units, indicating that this capacitor has an 0805 (2012 metric) package size, but more precisely it is referred to as 1808 which means 18 x 08 mm in a metric system and the 4520 metric also refers to 18 x 08.