A.O. Smith 624592-004 Round Capacitor (565-678 Mfd) are A.C. MOTOR RUN CAPACITORS. 

OEM #:   61B1D250064NRME

How is an AO Smith Motor Run Capacitor manufactured/built?

They are manufactured with a dielectric material that consists of two sheets of polypropylene film. Each one with a thin layer of vacuum deposited metal on one side. Metals are selected according to final application and can be either aluminum/zinc or zinc. Both films are act as electrodes in the capacitor but; because this metal is just a few hundred angstroms thick, it has a very limited current carrying capability at any single point in the dielectric. To compensate for this limitation, the entire edge of each electrode is bonded by a metallized endspray that has a relatitively high current carrying capability. The endspray serves as the termination point for the internal connections of the capacitor. This construction minimizes the current at any single point of the electrode. The current capability is enhanced by soldered or welded end terminations. These capacitors are self-healing, a property of the metallized film to restore itself to an operating condition when a dielectric breakdown occurs during operation. The thin metal layer around the fault point will act like a low current carrying fuse. Under a fault condition the current will evaporate the metal around the fault point and clear the fault. This is accomplished by special frame work of the film with a specific ohmic resistivity and low melting pointtemperature the evaporation ofthe electrode will result in a capacitance loss that is virtually unmeasurable. All films for capacitors have particularly low dielectric losses, high level of insulation and dielectric strength.  These capacitors are provided with an internal protective device to prevent case rupture under capacitor fault conditions at specified levels of voltage and fault current. The internal protector is a pressure sensitive interrupter and the dielectric medium is made of vegetable oil. The kind of enclosure can be oval or round.