The part number CAP CER 27PF 1KV NP0 1812 refers to a specific type of ceramic capacitor. This component has a capacitance value of 27 picofarads with an tolerance range of ±10 percent and can withstand voltages up to 1000 volts (1 kilovolt). It belongs to the C0G, also known as NP0, dielectric class, which is characterized by its high stability over temperature. The capacitor's case size is 1812, which corresponds to a metric designation of 4532.