EPCOS B43586 Capacitors — B43586-S9418-Q1

Technical Dossier

Product Details And Specifications

EPCOS B43586 Series: Comprehensive Module Range and Technical Overview

The EPCOS B43586 series is a family of screw-terminal aluminum electrolytic capacitors engineered for DC link and energy storage applications in heavy industrial environments. These capacitors are deployed across global heavy industry sectors including chemical processing plants, nuclear power auxiliary systems, petroleum refinery drive systems, wind turbine converters, and large-scale UPS infrastructure. The B43586 series is characterized by its high ripple current capability, extended operational temperature range (up to 85°C), and long rated lifetime (typically 5,000–10,000 hours at rated conditions), making it a standard specification component in medium-voltage variable frequency drives (VFDs), active front-end rectifiers, and regenerative braking systems. EPCOS (now TDK Electronics) has maintained this series as a core catalog item for industrial OEMs and MRO distributors worldwide.

The Evolution of B43586 Architecture

The B43586 series traces its design lineage to EPCOS's B43500 and B43560 platform families, which established the screw-terminal form factor as the industrial standard for DC bus capacitor banks in the 1990s. The B43586 generation introduced improved electrolyte formulations that extended shelf life and reduced ESR (Equivalent Series Resistance) at high frequencies, directly addressing failure modes observed in earlier-generation drives operating in high-ambient-temperature enclosures.

Key architectural milestones include: the transition from rubber-sealed to pressure-relief valve designs for improved safety in sealed enclosures; the adoption of aluminum alloy terminal studs rated for higher torque specifications; and the introduction of extended-life electrolyte variants (designated by the -Q suffix in the part number) targeting 10,000-hour operational lifetimes. The -Q1 suffix on the B43586-S9418-Q1 specifically denotes a qualification grade suitable for demanding industrial duty cycles.

Compatibility note: B43586 capacitors use standardized can dimensions and terminal pitch, allowing cross-compatibility with mounting hardware designed for the B43564 and B43584 series in many applications, though electrical parameters must be independently verified before substitution.

B43586 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the EPCOS B43586 series. Models are organized by capacitance and voltage rating. Each entry reflects a distinct electrical specification.

B43586-S9418-Q1: 4700µF / 400V DC link capacitor, screw terminal, 85°C, extended life grade.
B43586-S9228-Q1: 2200µF / 400V, screw terminal, standard DC bus filter application.
B43586-S9108-Q1: 1000µF / 400V, compact DC link, suitable for mid-power VFD stages.
B43586-S9478-Q1: 4700µF / 450V, elevated voltage rating for 480V AC input drives.
B43586-S9688-Q1: 6800µF / 400V, high-capacitance DC bus bank module.
B43586-S9108-M2: 1000µF / 400V, standard grade, general industrial duty.
B43586-S9228-M2: 2200µF / 400V, standard grade, high-volume OEM specification.
B43586-S9338-Q1: 3300µF / 400V, mid-range capacitance for 15–30kW drive platforms.
B43586-S9338-M2: 3300µF / 400V, standard grade equivalent of -Q1 variant.
B43586-S9478-M2: 4700µF / 450V, standard grade, 480V system compatibility.
B43586-S9688-M2: 6800µF / 400V, standard grade, large drive DC bus.
B43586-S9158-Q1: 1500µF / 400V, intermediate capacitance, regenerative drive applications.
B43586-S9158-M2: 1500µF / 400V, standard grade, general purpose DC link.
B43586-S9828-Q1: 8200µF / 400V, high-energy storage, large UPS and active rectifier systems.
B43586-S9108-Q3: 1000µF / 400V, extended temperature variant, high-ambient enclosure installations.
B43586-S9228-Q3: 2200µF / 400V, extended temperature, chemical plant drive applications.

Sourcing Hard-to-Find & Obsolete B43586 Parts

The B43586 series, while still listed in the TDK Electronics catalog, includes numerous sub-variants and date-code-specific builds that have transitioned to limited-availability or extended lead-time status. Industrial facilities operating legacy VFD platforms from Siemens, ABB, Danfoss, and Yaskawa frequently require exact-match replacements to maintain OEM warranty compliance or to avoid re-engineering DC bus capacitor bank assemblies.

DriveKNMS maintains a dedicated inventory of B43586 series capacitors sourced from authorized distribution channels and verified surplus stock. For discontinued sub-variants, DriveKNMS provides cross-reference analysis to identify electrically equivalent replacements within the B43586 family or from compatible EPCOS/TDK series (B43564, B43584, B43630). All sourced components are supplied with traceable documentation including date codes and country of origin certification. Customers requiring long-term maintenance contracts for multi-unit capacitor bank replacements are supported with scheduled supply agreements.

Quality Control for the B43586 Range

Aluminum electrolytic capacitors in the B43586 series require specific verification procedures that differ from standard passive component inspection. DriveKNMS applies the following test protocol to all B43586 units prior to shipment:

Capacitance measurement: Verified at 120Hz using a calibrated LCR meter against the rated value ±20% tolerance band specified in the EPCOS datasheet.
ESR verification: Measured at 100kHz to confirm electrolyte integrity; elevated ESR is the primary indicator of electrolyte degradation in aged or improperly stored units.
Leakage current test: DC bias applied at rated voltage for a defined soak period; leakage current measured and compared against the datasheet maximum.
Physical inspection: Pressure relief valve condition, terminal stud integrity, sleeve labeling legibility, and absence of electrolyte residue are verified visually.
Date code audit: Manufacturing date codes are recorded and cross-referenced against known production batches to identify units approaching recommended shelf-life limits (typically 2 years from manufacture date for unformed capacitors).

Units failing any parameter are quarantined and not shipped. Test records are retained and available upon request for quality-critical procurement.