What is the correlation between the rated voltage and insulation resistance of a common-mode inductor?

Rated voltage and insulation resistance are complementary indicators of safety performance:

 · Rated voltage: Refers to the peak long-term operating voltage that an inductor can withstand (such as line voltage or common-mode surge voltage), which depends on the dielectric strength of the winding insulation material and the design of the creepage distance.

 · Insulation resistance: It measures the insulation isolation ability between the winding and the magnetic core or shell (unit: MΩ), reflecting the risk of material aging or moisture.

 · Relevance logic:

 High rated voltage requires high insulation resistance (such as medical or automotive applications requiring ≥100MΩ) to prevent breakdown or excessive leakage current.

 Insulation resistance testing typically employs a DC high-voltage source (such as a 500V/1000V megohmmeter) to apply voltage and measure leakage current, ensuring that the insulation strength standards are met.

 Standard basis: For example, IEC 60664 (Clearances and Creepage distances) or AEC-Q200 (Automotive grade insulation requirements) explicitly stipulate the collaborative relationship between the two.