Why the DC bus moved to film
An electrolytic DC-link has a limited ripple-current rating, a finite lifetime that halves with every 10 °C rise, and an end-of-life mode that opens or shorts. Metallized polypropylene to IEC 61071 carries far higher ripple current, has a self-healing dielectric, and degrades gradually — which is why wind, PV, drive and traction converters have been converting to film DC links.
Available constructions
- C480 / C481 — the core DC-link family: 450 – 2,300 V DC, 33 – 2,000 µF, −40 °C to +85 °C, to IEC 61071.
- MKP-V — round metallized polypropylene in an aluminium case, 600 – 5,000 V DC, dV/dt > 20 V/µs, for DC-link filtering and storage in SMPS, UPS, drives and welding equipment.
- MKP-F — rectangular metallized polypropylene for DC support and filtering in wind converters, PV inverters, energy-storage converters and general-purpose drives.
| Series | Voltage | Capacitance | Case | Application |
|---|
| C480 / C481 | 450 – 2,300 V (DC) | 33 – 2,000 µF | per rating table | Wind, PV, VFD, traction |
| MKP-V | 600 – 5,000 V (DC) | per rating table | Round metal case | DC-link filter / storage |
| MKP-F | per rating table | per rating table | Rectangular metal case | Renewables, DC support |
| CBB84 | per rating table | per rating table | Low inductance | IGBT snubber (module side) |
Sizing the DC link
DC-link capacitance is set by the ripple current, the allowed voltage ripple and the converter topology — not by the nominal DC voltage alone. Send the converter rating, switching frequency, DC voltage and the ripple current you need to absorb, and we will propose the series, capacitance and case.
Frequently asked questions
Can a film DC-link replace an electrolytic capacitor directly?
Electrically it is usually better — higher ripple current, longer life, self-healing — but the capacitance per unit volume is lower, so the mechanical envelope and the capacitance value need to be re-sized. Send the original part number and the available space.
Which standard do your DC-link capacitors follow?
The C480 / C481 family is designed to IEC 61071.
Do you support custom DC-link designs?
Yes — capacitance, voltage, case form and termination are all adapted per project.
What is the lead time for CV series mica capacitors?
Standard items are produced in 4–8 weeks from order confirmation. Custom designs are scheduled individually.
See also
Supply, payment and documentation terms
Commercial and technical terms per order: price, lead time, minimum quantity, samples, payment procedure and the shipping document pack.
PricePrice on request: we issue a quotation within 2 working days of receiving your part list (type, capacitance, voltage, quantity).
Lead timeStandard items are produced in 4–8 weeks from order confirmation; custom designs are scheduled individually.
Minimum orderSmall batches and custom designs are supported; minimum quantity is confirmed per specific part number.
SamplesSamples for qualification testing are available on request, before a series order is placed.
PaymentSettlement currency, payment method and delivery basis (Incoterms 2020) are confirmed in the quotation for each specific request.
Shipping & deliveryShipped directly from the factory: by road or rail via western crossings (including transit through Kazakhstan), air freight for urgent items. Import VAT and customs duties are paid by the importer.
Certificates & documentsCertificate of origin, invoice and packing list, transport documents (CMR / rail waybill), technical specification and inspection certificate — English or Russian as required.
Regulatory documentsInformation support for TR CU 004/2011 and TR CU 020/2011 declarations and EAC marking: we provide product characteristics and data for filing.
WarrantyWarranty term and conditions are fixed in the supply contract; batch acceptance test reports are available on request.
Request price and lead time
Send us your part list (type, capacitance, voltage, tolerance, temperature range) and quantity — we will reply with a quotation within 2 working days.
Phone / WeChat+86 139 8161 9833