Motor Start, Motor Run Capacitors (AC)

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	Mfr Part #	Quantity Available	Price	Tariff Status	Series	Package	Product Status	Capacitance	Tolerance	Voltage Rating - AC	Voltage Rating - DC	Dielectric Material	Operating Temperature	Polarization	Applications	Lead Spacing	Size / Dimension	Height - Seated (Max)	Mounting Type	Package / Case
	B33331I6206J080 20UF 450V S2 AL 35X75 VDE UL 2+2 EPCOS - TDK Electronics	613 In Stock	1 : $11.03000 Bulk	-	B33331I6	Bulk	Active	20µF	±5%	450V	-	Polypropylene (PP), Metallized	-40°C ~ 85°C	-	Motor Run	-	1.378" Dia (35.00mm)	3.031" (77.00mm)	Chassis Mount	Radial, Can
	C274AC35200SA0J CAP FILM 20UF 5% 470VAC RADIAL KEMET	235 In Stock	1 : $13.18000 Bulk	-	C274	Bulk	Active	20µF	±5%	470V	-	Polypropylene (PP), Metallized	-25°C ~ 85°C	-	Motor Run	0.528" (13.40mm)	1.772" Dia (45.00mm)	2.992" (76.00mm)	Chassis, Stud Mount	Radial, Can

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A motor start capacitor provides a temporary power boost to help single-phase electric motors start by creating a phase shift in the windings and is disconnected once the motor reaches operating speed. A run capacitor, on the other hand, stays in the circuit continuously, improving efficiency, torque, and power factor while the motor runs. If a start capacitor fails, the motor may hum, struggle to start, or fail entirely, whereas a faulty run capacitor can cause overheating, reduced efficiency, or motor stalling under load.