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Capacitor Insulation Resistance

Insulation Resistance: [IR] Direct current resistance between two conductors that are separated by an insulating material. IR can be measured across the terminals of the capacitor.

The resistance to stray direct current of relatively small value which flows through or across the surface of the insulation when a voltage is impressed across the insulation.

MIL-PRF-19978 Capacitor Insulation Resistance Specification
Capacitor Insulation Resistance

There are two types of insulation resistance; The insulation resistance from terminal to terminal. The insulation resistance from one or more terminals to the exterior case or insulating sleeve.

The insulation resistance decreases as the temperature increases, and decreases as Moisture in the dielectric increases. At high temperatures insulation resistance should be considered during the design process.

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