The part number for this component is CAP CER 1200PF 1KV C0G/NP0 1808. It's a ceramic capacitor with a capacitance value of 1200 pF and a tolerance of ±10%. The rated voltage is 1000V (or 1kV). This capacitor adheres to the C0G or NP0 specification, indicating its stability across a range of temperatures. The metric size code 4520 corresponds to an 1808 package.