21FD3725A-F is an AC motor run capacitor from the Type MPF series, designed for reliable alternating current applications. This oil-filled metallized polypropylene capacitor features a 25.0 µF capacitance with ±10% tolerance and a rated voltage of 370 Vac. It is housed in a round aluminum case (Style 21) with dimensions of 1¾" diameter and 2.84" height, featuring tin plated steel terminals with 4-prong quick disconnect configuration. The capacitor is internally protected with a pressure sensitive interrupter for fail-safe operation and operates at temperatures up to 70°C. Common applications include air conditioning, refrigeration, power factor correction, and motor-run circuits where low dissipation factor and compact size are essential.