A bulging body on a run capacitor indicates which condition?

• A. Bad capacitor
• B. Normal operation
• C. Overcooling
• D. Low voltage

Answer: (A)

A bulging body on a run capacitor signals that the component has failed. When a capacitor deteriorates, internal pressure from dielectric breakdown, electrolyte vapors, or gas buildup causes the can to swell. That swelling is a clear fault indicator, and the capacitor should be replaced to prevent venting, leakage, or a potential electrical fault in the motor circuit.

Normal operation would not produce a swollen can—the case should be smooth and intact. The other conditions listed don’t cause this physical change: overcooling isn’t linked to the capacitor’s shape, and low voltage doesn’t create bulging. So a bulged capacitor is a bad capacitor and needs replacement.