These capacitors are designed to replace the original capacitor that has failed. You must replace the part as the motor may simply not work, draw excessive current or have poor torque.
These are suitable for motors operating at up to 400VAC and common values are offered here. Please note it is important to choose the correct value for the motor otherwise the starting torque of the motor will change.
12uF 400VAC Run Start Capacitor
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safety of high frequency horn drivers,
i buy these for safety of high frequency horn drivers, to prevent the low frequencies from passing to the driver, causing burnout. check the impedance at the crossover frequency. the frequency where 10mf become 8 ohms means a 3 db drop at that frequency, if the driver is 8 ohms. the attentuation increases below that frequency and reduces above. It is also usual to include a lamp to create a negative resistance/power curve, further protecting the driver. a kind of limiter. The older tungsten car lamps are suitable.