Industrial Power Conversion Solution — EPCOS B43586-S9418-Q1 | B43586 Series
Where This Product Is Used
The EPCOS B43586-S9418-Q1 is a high-capacitance snap-in aluminum electrolytic capacitor engineered for demanding industrial power electronics applications. Engineers specify this component in:
- Variable Frequency Drives (VFDs) — DC bus filtering and energy storage in motor drive inverters (0.75 kW–500 kW range)
- Uninterruptible Power Supplies (UPS) — Bulk capacitance in online double-conversion UPS systems for data centers and critical infrastructure
- Industrial SMPS / Switch-Mode Power Supplies — Output filtering and hold-up time extension in 3-phase rectifier front-ends
- Renewable Energy Inverters — DC link capacitance in solar string inverters and wind turbine converters
- Welding Equipment — Energy reservoir in inverter-based MIG/TIG welding power sources
- Elevator & Crane Drives — Regenerative braking energy absorption in hoist control systems
- Industrial Robotics — Servo drive DC bus stabilization in multi-axis robot controllers
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | B43586-S9418-Q1 |
| Manufacturer | EPCOS (TDK Group) |
| Series | B43586 |
| Capacitance | 1800 µF |
| Rated Voltage (VR) | 400 V DC |
| Capacitance Tolerance | -10% / +30% |
| Mounting Style | Snap-In (PCB / Chassis) |
| Operating Temperature | -25°C to +85°C |
| Endurance | 2000 hours @ 85°C |
| Ripple Current (100 Hz) | Refer to EPCOS datasheet |
| ESR (Equivalent Series Resistance) | Low ESR design |
| Case Diameter | Refer to EPCOS datasheet |
| Lead Spacing | Snap-In standard pitch |
| RoHS Compliance | Yes |
Why Engineers Specify This Model
- High Voltage + High Capacitance Combination — 400 V / 1800 µF delivers substantial energy storage (E = ½CV²) in a compact snap-in footprint, reducing board space vs. parallel arrays of smaller caps.
- EPCOS B43586 Series Reliability — This series is a benchmark in industrial power electronics, with proven field performance in millions of VFD and UPS installations globally.
- Snap-In Mounting Convenience — Enables direct PCB or chassis mounting without additional hardware, simplifying assembly and reducing BOM cost.
- 85°C / 2000-Hour Endurance Rating — Suitable for continuous industrial duty cycles with adequate thermal management.
- TDK Group Pedigree — EPCOS is a TDK brand, ensuring consistent manufacturing quality, traceability, and long-term supply continuity.
Complete System Bill of Materials
When designing a VFD or UPS DC bus using the B43586-S9418-Q1, engineers typically also specify:
- DC Bus Balancing Resistors (bleed resistors across each capacitor)
- Inrush Current Limiting NTC Thermistors or Pre-charge Resistors
- Capacitor Mounting Brackets / Clamps (for chassis-mount configurations)
- Bus Bar Connectors and Copper Laminated Bus Bars
- Rectifier Bridge Modules (3-phase, matched voltage rating)
- Gate Driver ICs and IGBT / SiC MOSFET Power Modules
- Thermal Interface Materials for heat sink assembly
Contact support@konmask.com for complete BOM sourcing assistance.
Compliance & Industry Standards
- RoHS 2011/65/EU — Compliant (lead-free construction)
- IEC 60384-4 — Aluminum electrolytic capacitors for use in electronic equipment
- AEC-Q200 — Not rated (industrial grade, not automotive qualified)
- CE Marking — Applicable per EPCOS product documentation
- REACH — Compliant per TDK/EPCOS declarations
Quality Assurance & Sourcing
Konmask.com sources the EPCOS B43586-S9418-Q1 exclusively through authorized distribution channels and verified industrial surplus networks. Every unit is subject to:
- Visual inspection for case integrity, lead condition, and date code verification
- Capacitance and ESR bench testing prior to shipment
- Anti-static packaging with humidity indicator cards for long-term storage protection
- Full traceability documentation available upon request (date code, lot number, country of origin)
We do not source from unverified gray-market channels. Counterfeit risk is actively managed through supplier audits and incoming inspection protocols.
How to Source This Part
- In-Stock Orders: Add to cart and proceed to checkout. We ship globally via DHL Express, FedEx International, and UPS.
- Bulk / OEM Quantities: Contact support@konmask.com for volume pricing and lead time on quantities >10 pcs.
- Urgent / Emergency Orders: Call or WhatsApp +0086 19859288691 for same-day quotation and expedited shipping options.
- Cross-Reference / Substitution: If you need an equivalent or alternative part (e.g., Nichicon, Vishay, Cornell Dubilier), our engineering team can recommend a validated substitute.
Application-Specific FAQ
Q: Can I use the B43586-S9418-Q1 in a 380 V AC three-phase VFD?
A: Yes. A 380 V AC three-phase rectifier produces approximately 537 V DC peak, but the DC bus typically operates at 540–600 V DC under load. The 400 V rating of this capacitor is not sufficient for a standard 380 V AC input VFD without a voltage de-rating strategy. Please consult your drive designer or contact us for a 450 V or 500 V rated alternative.
Q: How many units are needed for a 10 kW VFD DC bus?
A: A common rule of thumb is 100–150 µF per kW of drive output power. For 10 kW, 2–3 units of the B43586-S9418-Q1 (1800 µF each) in parallel would provide 3600–5400 µF, which is within the typical design range. Final selection depends on hold-up time requirements and ripple current budget.
Q: What is the shelf life of this capacitor?
A: EPCOS aluminum electrolytic capacitors have a shelf life of 2 years from date of manufacture when stored at ≤35°C and ≤75% RH. Units stored beyond this period require a voltage conditioning (reformation) procedure before use.
Q: Do you provide a datasheet?
A: Yes. The official EPCOS/TDK datasheet is available upon request. Contact support@konmask.com with your order or inquiry reference.
Q: Is this part suitable for 105°C ambient environments?
A: The B43586-S9418-Q1 is rated to 85°C. For 105°C ambient applications, please inquire about EPCOS B43630 or B43644 series alternatives.
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