Application Guide, Aluminum Electrolytic Capacitors
Aluminum electrolytic, motor-start capacitors are non-polar and designed for intermittent operation in starting single-phase induction motors or for other brief AC applications such as motor-run
The electrical characteristics of aluminum electrolytic capacitors with plain (not etched) foils are, in part, better, but these capacitors are considerably larger and are only used for special applications nowadays.
Aluminum electrolytic capacitors can generally withstand rapid charging along with occasional overvoltage transient spikes of lim-ited energy. If transients above the capacitor's rated DC voltage are anticipated in the application, please contact us to discuss the best capacitor for the application.
Aluminum electrolytic capacitors for general applications are called "General-Purpose Grade" (GP) in IEC publications. The international standard for aluminum electrolytic capacitors is IEC 60384-4.
The basic material of the anode for aluminum electrolytic capacitors is a foil with a thickness of ~ 20–100 μm made of aluminum with a high purity of at least 99.99%. This is etched (roughened) in an electrochemical process to increase the effective electrode surface.
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