Capacitor
Industrial Capacitors for Power Electronics & Heavy-Duty Applications
Industrial capacitors store and release electrical energy within high-demand power systems, filtering voltage ripples, suppressing transients, and stabilizing power factors. Engineered for continuous duty in harsh operating environments, these components utilize high-grade metallized dielectric films or specialized electrolytic formulations. They withstand high ripple currents, thermal cycling, and voltage spikes without premature degradation, serving as critical passive components in industrial automation, renewable energy generation, and power transmission infrastructure.
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Product Types
Metallized Polypropylene Film Capacitors (MKP / CBB Series):
Designed for AC filtering, high-frequency switching power supplies, and induction heating. Characterized by low dielectric loss, self-healing properties, and stable capacitance across frequency ranges.
Power Factor Correction (PFC) Capacitors:
Cylindrical or prismatic aluminum-can capacitors utilized in industrial power distribution panels to compensate for reactive power, reduce harmonic distortion, and optimize grid efficiency.
DC-Link Capacitors:
Engineered for inverters, motor drives, and photovoltaic systems. Features high ripple current handling capability, low Equivalent Series Resistance (ESR), and high volumetric efficiency to replace traditional electrolytic banks in high-stress DC circuits.
Aluminum Electrolytic Capacitors (Screw Terminal / Snap-In):
High capacitance density solutions tailored for bulk energy storage in industrial power supplies, uninterruptible power supplies (UPS), and heavy-motor starting circuits.
Key Specifications
|
Parameter |
Technical Range / Specification |
|
Rated Voltage (VDC / VAC) |
250VDC to 3000VDC / 110VAC to 690VAC |
|
Capacitance Range |
0.1 uF to 10,000 uF |
|
Capacitance Tolerance |
+/- 5 percent, +/- 10 percent (Standard); +/- 2 percent (Precision grade available) |
|
Operating Temperature Range |
-40 deg C to +85 deg C / +105 deg C |
|
Dissipation Factor (tan delta) |
<= 0.001 at 1 kHz (Film dielectric variants) |
|
Dielectric Material |
Metallized Polypropylene (PP), Polyester (PET), or Aluminum Electrolyte |
|
Terminal Types |
Threaded studs, fast-on tabs, copper busbar terminals, PCB solder pins |
|
Enclosure / Casing |
Aluminum can, flame-retardant plastic case (UL94 V-0), epoxy resin sealing |
Features & Performance
Self-Healing Dielectric Property:
Film layers incorporate a microscopic metal deposition pattern. In the event of a localized dielectric breakdown caused by overvoltage, the energy arc vaporizes the thin metal layer surrounding the fault, instantly isolating the short circuit and maintaining normal capacitance function.
Low Equivalent Series Resistance (ESR):
Minimized internal ohmic resistance reduces self-heating during high-frequency ripple current transit, extending operational lifespan in continuous-duty power conversion systems.
Advanced Thermal Dissipation:
Capacitors utilize dry resin filling or specialized biodegradable oil impregnation paired with heavy-duty aluminum housings to transfer core heat efficiently away from the active winding element.
High Surge Current Tolerance (i-peak):
Withstands repetitive high-amplitude pulse currents encountered in motor starting, snubber circuits, and energy discharge applications without structural electrode degradation.
Renewable Energy Systems: DC-link filtering and output smoothing in solar photovoltaic inverters and wind turbine frequency converters.
Motor Drives & Industrial Automation: Harmonic filtering, DC bus smoothing, and regeneration braking energy handling in Variable Frequency Drives (VFDs) and servo controllers.
Power Distribution & Smart Grids: Reactive power compensation in automatic power factor correction (APFC) panels to reduce line losses and stabilize industrial plant voltage levels.
Welding & Induction Heating Equipment: Resonant circuit tuning and energy storage banks in high-frequency industrial welding power sources.
Determine Circuit Function: Identify whether the application requires DC filtering, AC harmonic filtering, energy storage, or power factor correction.
Calculate Voltage and Ripple Requirements: Ensure the rated working voltage exceeds maximum circuit transient peaks. Verify that the root-mean-square (RMS) ripple current does not exceed the capacitor's thermal threshold at operating frequency.
Evaluate Thermal Environment: Select appropriate temperature ratings (such as 105 deg C series) if the component is mounted near heat-generating power semiconductors or enclosed within unventilated cabinets.
Confirm Mechanical Constraints: Match physical dimensions, mounting stud diameters, and busbar terminal spacings to existing enclosure layouts.
Manufacturing & Quality Control
Automated Film Winding:
High-precision winding machinery maintains uniform tension and layer alignment to eliminate air pockets and internal corona discharge risks.
01
Vacuum Drying & Impregnation:
Winding elements undergo controlled thermal vacuum processing to eliminate moisture traces prior to hermetic sealing in resin or aluminum housings.
02
100 percent Electrical Screening:
Every production batch undergoes automated testing for capacitance value, tangent of loss angle (tan delta), Equivalent Series Resistance (ESR), and dielectric withstanding voltage (flash test).
03
Environmental Stress Testing:
Sample lots are subjected to accelerated life testing (ALT) at rated voltage and maximum operating temperature for 1,000 to 3,000 hours to verify long-term capacitance stability.
04
Compliance Verification:
Manufacturing facilities operate under ISO 9001 quality management systems. Products comply with IEC 61031, IEC 60831, UL 810, RoHS, and REACH directives.
05
Customization / OEM & ODM
Dimensional & Terminal Adaptations:
Custom can diameters, heights, bolt thread pitches (such as M6, M8, M10), and custom-punched copper busbar terminals configured to match specific enclosure layouts.
Electrical Parameter Tuning:
Tailored capacitance values, strict tolerance sorting (+/- 1 percent), or enhanced voltage derating profiles for specialized high-pulse military or medical power supplies.
Laser Etching & Private Labeling:
Customer part numbers, batch traceability matrix codes, and corporate branding laser-engraved directly onto aluminum cans.
Packaging & Delivery
Protective Packaging:
Individual units are packed in anti-static foam inserts or compartmentalized heavy-duty corrugated cartons to prevent terminal bending and physical denting during international transit.
Moisture Barrier Protection:
Bulk shipments include desiccant packets and sealed polyethylene liners to protect internal components from high-humidity ocean freight environments.
Global Logistics Support:
Flexible shipment terms including FOB, CIF, and DDP via air freight or containerized sea freight, accompanied by complete material test reports (MTR) and certificate of conformity (CoC).
Our Certificate
FAQ
As one of the most professional capacitor manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality capacitor made in China here and get pricelist from our factory. For price consultation, contact us.
Self Cleaning Capacitor, High Temperature Capacitors, Variable Vacuum Capacitor