[Explanation of the Cause of Capacitor Failure] An electrolytic capacitor installed horizontally has burst.
A Must-Read Guide for Circuit Designers: 15 Examples of Causes and Countermeasures for Capacitor Failures
A structure that eliminates the filler material and fixes the element with ribs has been adopted! The installation method has been changed to be at the "12 o'clock position"!
We would like to introduce a case where a horizontally mounted screw terminal aluminum electrolytic capacitor failed and the sealing part burst. The failed screw terminal aluminum electrolytic capacitor was mounted horizontally with the pressure relief valve positioned at the "6 o'clock" direction. When a capacitor deteriorates or fails, the temperature of the capacitor element rises rapidly, causing gas to be generated inside. This capacitor uses a filler material to secure the element, and as the element temperature increases, this filler material softens and flows, blocking the pressure relief valve. As a result, the smooth operation of the pressure relief valve was hindered, leading to a crack in the sealing part. [Countermeasures] - Change the mounting method so that the pressure relief valve of the aluminum electrolytic capacitor is positioned at the "12 o'clock" direction. - Adopt a structure that secures the element with ribs instead of using filler material. *For more details, please refer to the PDF document or feel free to contact us.
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Please take note of the following: ■ The screw terminal type aluminum electrolytic capacitor is designed for vertical mounting with the terminal side facing up. ■ It cannot be mounted upside down with the terminal side facing down. ■ There is a possibility that the capacitor's lifespan may be shortened, or it may lead to dangerous failures such as liquid leakage or capacitor rupture. ■ If horizontal installation is unavoidable, please install it with the pressure relief valve or the anode terminal facing up. *For more details, please refer to the PDF document or feel free to contact us.
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Applications/Examples of results
If you see the following symptoms in a capacitor, it is faulty: ■ The case is swollen (bulging) ■ There are cracks in the case ■ There is a gap between the case and the sealing part ■ The pressure valve has activated (the pressure valve has opened) ■ The case has burst ■ It is hot or generating heat ■ Smoke is coming out ■ There is liquid leakage ■ There are unusual sounds ■ There is an unusual smell *For more details, please refer to the PDF document or feel free to contact us.
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AIC tech handles Aluminum electrolytic capacitors and Film capacitors for industrial market. Our capacitors have a history of more than 70 years and have their origins in technological development in Japan. AIC tech delivers high-value, precision capacitors tailored for power electronics—from renewable energy and industrial systems to transportation, ICT/IoT, healthcare, and infrastructure. Please feel free to contact us if you have any requests.