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Reliable Film Capacitor Solution for Snubber and Pulse Applications
Kingtronics FKT-SA double-sided metallized polypropylene film capacitors for pulse and high voltage designs
When designing high-voltage or high-frequency systems, engineers frequently confront one major challenge: finding a capacitor that delivers predictable performance under demanding pulse and snubber conditions. Many film capacitors look sufficient on paper—but when exposed to fast discharge events, elevated temperatures, and repeated cycles, issues such as rising dissipation, capacitance shift, or insulation degradation can appear in real operation.
The Kingtronics FKT-SA Series is specified as a double-sided metallized polypropylene film capacitor with a non-inductive configuration. According to the datasheet, it offers low loss and small inherent temperature rise, a negative temperature coefficient of capacitance, and an epoxy resin dip-sealed construction for flame-resistant circuits. It is referenced to IEC 61071 and designed for high voltage, high frequency and pulse applications, lamp capacitors for electronic ballast compact lamps, and snubber / SCR commutation circuits.
Key Technical Characteristics
Datasheet-based parameters for engineering selection
- Double sided metallized polypropylene structure with non-inductive configuration.
- Low loss and small inherent temperature rise; negative temperature coefficient of capacitance.
- Reference Standard: IEC 61071.
- Climatic Category: 40 / 105 / 56.
- Operating temperature range: −40 °C to +105 °C.
- Rated temperature range:
• up to +85 °C for rated DC voltage (VR(DC))
• up to +75 °C for rated AC voltage (VR(AC)) - Derating above these points: from +85 °C to +105 °C for DC, and from +75 °C to +105 °C for AC, with a decreasing factor of 1.25% per °C for VR.
- Rated voltages: 250 V, 400 V, 630 V, 1000 V, 1600 V, 2000 V.
- Capacitance range: 0.00022 µF to 3.9 µF.
- Capacitance tolerance options: ±2%, ±3%, ±5%, ±10%, ±20%.
- Voltage proof: 1.60 UR (5 s).
- Dissipation factor: ≤ 0.0010 @ 1 kHz, 20 °C.
- Insulation resistance at 20 °C, 100 V, 1 min:
• CR ≤ 0.33 µF: ≥ 50 000 MΩ
• CR > 0.33 µF: ≥ 15 000 s
Typical Applications
High voltage, high frequency and pulse circuits, snubber and lamp capacitor use
The FKT-SA Series is listed for the following application areas in the datasheet:
- High voltage, high frequency and pulse circuits.
- Lamp capacitor for electronic ballast compact lamps.
- SNUBBER and SCR commutation circuits.
Temperature and Frequency Characteristics
Capacitance, dissipation, operating voltage and insulation behaviour
The FKT-SA datasheet includes charts that show how capacitance, dissipation factor, operating voltage and insulation resistance behave over temperature, as well as capacitance and dissipation vs. frequency. These curves give engineers a reference for estimating capacitor behaviour in high voltage, high frequency and pulse circuits when actual operating conditions differ from nominal test points.
FKT-SA Pulse and Snubber Application Video
Overview of Kingtronics FKT-SA film capacitor series
The following video introduces the Kingtronics FKT-SA film capacitor series and highlights how this double-sided metallized polypropylene construction can be used in pulse and snubber applications.
FKT Series Catalog for Sourcing and Design
Family overview and detailed electrical ratings
Kingtronics FKT Series Film Capacitor Catalog (PDF)
The FKT Series catalog provides an overview of Kingtronics film capacitor types in this family, including ratings, dimensions and ordering information for FKT-SA and related series.
The catalog helps engineering and sourcing teams compare available voltage ratings, capacitance ranges and mechanical formats within the FKT family.
Procurement Considerations for Engineers & Buyers
Matching rated values, derating curves and application requirements
When specifying film capacitors for pulse and snubber applications, engineers and procurement teams typically review:
- Rated voltage and capacitance ranges appropriate for the target circuit.
- Operating temperature range and the stated derating factors vs. temperature.
- Dissipation factor and insulation resistance under specified test conditions.
- Climatic category and reference standard (IEC 61071 for FKT-SA).
Because these parameters are clearly listed in the FKT-SA datasheet, the series can be evaluated and compared against the electrical and environmental requirements of high voltage, high frequency and pulse systems.
For full technical data and the complete list of available ratings, please refer to the FKT-SA product page and catalog.
Explore FKT-SA Specifications →
To request quotations or discuss engineering requirements:
Final Notes
For applications involving high-voltage pulses, snubber networks or high-frequency switching, the Kingtronics FKT-SA Series provides a double-sided metallized polypropylene film capacitor option with clearly defined ratings and characteristics for engineering evaluation.
