TDK’s EPCOS B32354S3* series is a 350 V AC film capacitor family offered in capacitances from 10 to 40 µF, with 52.5 mm lead spacing and component-level UL 810 approval. TDK announced the series on May 7, 2019, for AC and power-supply filtering, including in drives, photovoltaic inverters and UPS systems. Its approval and humidity-test results are useful selection evidence, but they do not by themselves certify a complete inverter or prove suitability for every outdoor installation.
What UL 810 approval means for an AC filter capacitor
ANSI/UL 810 covers AC capacitors and capacitor banks with internal fault-current protection. UL’s overview identifies applications in appliances, air conditioning, refrigeration, motors and power-factor correction. TDK says the B32354S3* capacitors’ segmented-film design enables them to conform to UL 810’s highest safety class at component level.
Component-level approval is evidence about the capacitor as a component; it is not an approval of the equipment into which it is installed. A designer still needs to establish that the complete product meets its applicable requirements and that the capacitor is used within its ratings. Check the exact part’s approval record and manufacturer documentation rather than treating “UL 810” as a blanket certification of an inverter, UPS, or installation.
What the EPCOS B32354S3* series offers
| Attribute | TDK EPCOS B32354S3* series |
|---|---|
| AC voltage rating | 350 V AC, as reported in TDK’s May 7, 2019 announcement |
| Capacitance range | 10–40 µF, as reported in TDK’s May 7, 2019 announcement |
| Lead spacing | 52.5 mm, as reported in TDK’s May 7, 2019 announcement |
| Safety recognition | UL 810 approval at component level, according to TDK’s May 7, 2019 announcement |
| Humidity test | TDK reports a temperature-humidity-bias test at 85 °C, 85% relative humidity and rated voltage for 1,000 hours |
| Expected life | 100,000 hours according to IEC 61071, as reported by TDK; this is a stated life expectancy, not a 100,000-hour humidity-test result |
| Applications cited | AC filtering and output filtering in power supplies, drives, photovoltaic inverters and UPS systems, according to TDK |
The 1,000-hour test is evidence of performance under the stated temperature, humidity and voltage conditions. It is not, on its own, a guarantee of a particular number of years outdoors: installation, operating temperature, electrical stress and enclosure conditions also matter. The announced lead spacing is helpful for checking board or chassis fit, but the announcement does not give all dimensions or electrical limits needed to approve a design.
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- 50 / 60 Hz Operating Frequency , -40 to +65°C Operating Temperature
- Supersedes all old Aerovox 810-972 , 810 972 uF , MARS 11083 , 11983 , JARD , Packard PSMJ810 PSMJ810A and other Start Capacitors with this uF/Mfd & VAC Rating.
How to decide whether it fits your design
- Match the electrical requirements. Select the needed capacitance within the 10–40 µF family range and confirm that 350 V AC is adequate for the circuit’s actual operating conditions. Verify ripple or current capability and other relevant limits in the exact part’s datasheet; the announcement does not establish those values.
- Check mechanical fit. Confirm the 52.5 mm lead spacing against the footprint, then check the exact part’s body dimensions, clearance and mounting requirements. Do not infer those details from lead spacing alone.
- Confirm the approval applies to the part. Verify the full B32354S3* part number and the component-level UL 810 recognition in current manufacturer or certification documentation. Confirm separately what approval the finished equipment requires.
- Assess the environment and service life. Compare the manufacturer’s test conditions with the actual temperature, humidity, voltage and expected duty cycle. Use the stated IEC 61071 life expectancy as a manufacturer-reported figure, not as a substitute for application-specific lifetime assessment.
Does it suit humid outdoor or inverter service?
TDK names photovoltaic inverters and UPS systems among the intended application areas, and its reported 85 °C/85% relative-humidity test at rated voltage for 1,000 hours is relevant evidence for demanding environments. These facts support considering the series for such designs; they do not establish that every part is suitable for direct outdoor exposure or for every inverter operating profile. Check the full datasheet and system-level environmental requirements, including enclosure conditions and the electrical stresses the capacitor will encounter.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How it compares with related AC film capacitor families
| Family | AC voltage and capacitance | Humidity or safety information in the cited manufacturer material |
|---|---|---|
| TDK EPCOS B32354S3* | 350 V AC; 10–40 µF | TDK reports component-level UL 810 approval and a 1,000-hour test at 85 °C, 85% relative humidity and rated voltage (TDK, May 7, 2019). |
| TDK/EPCOS B3275* | 250–400 V AC; 1–70 µF | TDK/EPCOS reports IEC 60384-14 Grade III and a 1,344-hour temperature-humidity-bias test at 60 °C and 95% relative humidity (2019 product-change notice). These data do not establish UL 810 approval for this family. |
| Vishay MKP1847H | Not stated in the cited Vishay product page | The page describes the family for outdoor, UPS and renewable-energy use, but lists UL 810 electrical approval as pending. Pending is not equivalent to granted approval. |
These test profiles are not directly interchangeable: the B32354S3* test uses a higher stated temperature, while the B3275* test uses higher stated relative humidity and runs longer. Neither comparison alone proves which family will last longer in a particular product. Compare the exact capacitance and AC rating, dimensions, current capability, fault-protection construction, test conditions and approval status for the specific part under consideration.
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