Withstand voltage

In electrical and electronic equipment, even in insulated parts, increasing the applied voltage can lead to a phenomenon called dielectric breakdown, allowing current to flow. When dielectric breakdown occurs, current flows through the high-resistance insulator, posing a risk of failure or fire due to heat generation. Dielectric strength refers to the maximum voltage that can be endured without causing dielectric breakdown. Normally, it is expressed as the magnitude of voltage that can be withstood when a specified voltage waveform is applied for a specified time between two designated points of the device. The higher this voltage, the better the insulation performance.