Power & connectivity manufacturer · A US company you deal with
We own our factories in China and Vietnam and make AC/DC adapters, chargers, power supplies, and cable assemblies on our own lines. So you get maker's pricing, a China-plus-one origin choice built in, and one accountable contact on US paper. When you need something we don't make, we source it to the same standard.
Most companies selling you power and cable are brokers who found a factory on a marketplace. We are the factory — our own lines in China and Vietnam — with a US company in front of it. You get maker's economics, one person who owns the outcome, and straight answers about what we can and can't do.
Not a broker, not a trading desk — we make the product on our own lines. You get a maker's price and a maker's answer, not a markup and a disappearing act once the container clears.
Our factories run in both China and Vietnam on one drawing set. Elect the country of origin that controls your duty — or shift the split as tariffs move — without qualifying a new supplier or re-listing a UL file.
You contract with a US company and reach one person who owns the outcome: dollars, US terms, US jurisdiction. If something goes wrong, you call one number and a person picks up.
The factories are the core, not the ceiling. If it is power or connectivity hardware we don't make, we source it to the same standard we build to — so one partner covers the whole line.
Two lines we manufacture — power and connectivity — in our own factories in China and Vietnam. Standard SKUs or built to your drawing, with origin, certification, and documentation on every unit. The adjacent parts we don't make, we source to the same standard.
HTS 8504.40
AC/DC power adapters, GaN chargers, and switching power supplies — standard or custom power supply builds to your voltage, connector, and enclosure.
Explore power →
HTS 8544.42
USB-C, HDMI, Ethernet, coax and fiber cables, hubs, and custom cable assemblies — molded, terminated, and tested on the same line as the power hardware.
Explore connectivity →
Need something we don't make? If it is power or connectivity hardware, we source it to spec — vetted the way we run our own lines. One partner for the whole line.
SMT and magnetics winding, injection molding, cable bunching, and 100% final test — the plant behind your build, not a marketplace listing.
Our factories run in both China and Vietnam, so the origin you elect is a lever on your landed cost. Drag the shipment size and watch what choosing Vietnam over China is worth.
Duty you stop overpaying is pure margin. At a 10% net margin, every $1 you keep does the work of $10 in new sales — so this one origin election earns what a large order would, without winning one.
of switching power supplies · HTS 8504.40.85
A 25.0-point duty gap · Verified 2026-08-07 · HTSUS Rev. 14 · Illustrative; duty on entered value · Updated monthly
Not just this shipment — the same gap rides every order you place.
Make this saving yours →
The person who answers
I grew up around this business — I can tell you what the injection-molding line sounds like and how long the ICT test takes, because I've stood next to both. When you contact Kestner you reach one accountable person, on US paper and in US jurisdiction. If something goes wrong, you call one number and I pick up.
Shangye (Mike) LiPrincipal, Kestner Supply
Prefer the phone? (574) 216-6551
Product certifications on the label, the retail packaging, and the documentation your procurement team audits against — plus the management-system standards our own manufacturing runs under. Each verifiable by file number; regional overlays (PSE, KC, BIS) on request.
cULus Listed
cRUus Recognized
cETLus (Intertek)
CE
FCC Part 15
RoHS
REACHcULus ListedcRUus RecognizedcETLus (Intertek)CEFCC Part 15RoHSREACHWe build the calculators we'd want as a buyer — sourced, dated, and free. Check a product's duty right here, then take the rest of the toolbox with you.
HTS 8504.40.85 · verified 2026-08-07 · estimate, not customs advice
The paperwork behind the product — the file your team and your customs broker actually need.
We run our own production lines in China and Vietnam — SMT and magnetics winding, injection molding, assembly, and 100% final test. Every unit is built, inspected, and warranted by the people who made it. That is the difference between a manufacturer and a broker who found a factory on a marketplace.
You get a single American company that stands behind what it sells. Not access to a factory, and not a broker's markup.
Straight answers, including about what we don't do yet. A procurement manager can tell the difference — so we draw the line clearly.
Today
Who you deal with
A US company and one accountable contact. A person answers.
Product & origin
Built to spec in Vietnam or China, origin documented per unit. You choose the origin to manage duty.
Pricing
In USD, with the tariff and landed-cost math shown, not buried.
Quotes
One business day for standard SKUs, three for custom. If we can't supply it, we say so on the first call.
On the roadmap
Importer of record
We are standing up US import capability to take title and clear customs ourselves. Today that's you or your broker — ask where we are.
DDP, duty-paid delivery
Arrives with the import capability above — duty as a line item on our invoice, not your surprise.
Net terms as principal
As the relationship and that capability are established.
Quotes within one business day for standard SKUs; three for custom. If we cannot supply it, we say so on the first call.
Request a quote