What does it mean if a capacitor is described as "rated" at a specific voltage?

When a capacitor is described as "rated" at a specific voltage, it indicates that the component is designed to safely operate at that particular voltage level. This voltage rating represents the maximum voltage the capacitor can handle without risking failure or damage under normal operating conditions. Operating a capacitor above its rated voltage can lead to overheating and eventual breakdown of the insulating material, which may result in failure or even catastrophic failure, such as explosion or leakage.

The rating does not imply that the capacitor cannot be used at voltages lower than the rated voltage – in fact, capacitors can function effectively at lower voltages, although this may reduce their performance in specific applications. The rating also does not establish a minimum required voltage for operation but serves as a safety threshold to ensure reliability and longevity of the capacitor within its intended use.