Motor Start Capacitors & Motor Run Capacitors

Motor Start Capacitors are in stock with same-day shipping at Mouser from industry leading manufacturers. Mouser is an authorized distributor for many motor start and motor run capacitor manufacturers including Cornell Dubilier / Knowles, KEMET, TDK and many more.

Motor start capacitors are high-capacitance electrical components designed to provide the additional starting torque needed to initiate the operation of single-phase AC motors. By delivering a temporary boost of electrical energy during startup, they help motors overcome inertia and reach operating speed quickly and efficiently while reducing strain on the motor. Their reliable performance supports smooth motor starting in demanding industrial, commercial, and equipment control applications.

Applications: Motor start capacitors are commonly used in compressors, pumps, conveyors, HVAC equipment, air handling systems, industrial machinery, and motor-driven automation equipment where enhanced starting torque is required.

Common Types: Common motor start capacitor types include electrolytic start capacitors, non-polarized start capacitors, round motor start capacitors, oval motor start capacitors, and heavy-duty start capacitors designed for intermittent motor starting applications.

Selection requirements: Choosing a motor start capacitor requires evaluating capacitance value, voltage rating, motor horsepower requirements, duty cycle, operating temperature range, physical size constraints, safety certifications, and application-specific startup torque needs to ensure reliable motor performance.

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Please view our large selection of motor start and motor run capacitors below.