My Type S capacitors label indicates that one terminal is the “high potential terminal”. What does that mean?
The term “high potential electrode” was chosen because the Type S capacitor is not polarized in the sense that an electrolytic capacitor is polarized, with a definite anode terminal and cathode terminal. Film capacitors such as this can be operated in either polarity (Note: Avoid or minimize reversing polarity). However, the Type S capacitor, like most wound film capacitors, has a slight asymmetry in its internal construction that results in one of the internal electrodes being closer to the internal surface of the plastic case than the other. There is a larger capacitance between this electrode and external conductors. The voltage potential between this electrode and an adjacent external conductor determines the electric field through the wall of the plastic case. The “high potential terminal” is connected to the electrode that is buried inside the winding and therefore shielded. In the case of one terminal being grounded, the “high potential terminal” should be connected to the high
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