About
Kestner Supply is a US-based, manufacturer-backed sourcing partner for power and connectivity hardware. We came up in manufacturing, so we vet from the inside — you buy from an American company and reach one person who owns the outcome.
Most companies that sell imported power and connectivity hardware to US buyers are brokers. They find a factory, mark up the invoice, and disappear once the container clears. We came the other way around.
We came up in power and cable manufacturing — in China, and in Vietnam, where the boards are populated, the cable is molded, and every unit is tested before it ships. It is the standard we hold every factory we source through to.
Kestner exists because we hold deep, working relationships with qualified lines in two countries — so we can build the same part in either, and almost nobody offers that from the buyer’s side. Same drawings, same test reports. You choose the country of origin — and when the tariff schedule moves, as it has repeatedly in the last eighteen months, you move your volume without requalifying a supplier, re-listing a UL file, or explaining anything to your own customer.
What we sell is not access to a factory. It is a single American counterparty who stands behind the goods. You buy from a US company, in dollars, on US paper, and reach one person who owns the outcome. If a shipment is late, you call one number and a person picks up.
We only sell what we can inspect, warrant, and stand behind. If something is not a fit, we say so — plainly, on the first call.
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 →
The factory floor is where we learned the trade — how a real production line runs, what a good supplier looks like, and how to test a part before it ships. That is the standard we hold everything to. It is not the ceiling on what we can source.
Kestner is a sourcing partner, not one factory’s storefront. Within power and connectivity hardware, we place your build on a partner line we already trust or qualify a new one to the same standard — whichever fits your spec, your certification, and the origin you need. If it is a part we do not already source, that is a sourcing problem we solve, not a door that closes.
We stay in that lane on purpose — nothing we cannot inspect, warrant, and stand behind. Inside it, the range grows with you, and a new line slots in without our becoming a different company.
The floor, not the ceiling
The certifications below are the minimum every order already clears — where we start, not where we stop. Held at the manufacturing level, each is verifiable by file number on request.
cULus Listed
cRUus Recognized
cETLus (Intertek)
CE
FCC Part 15
RoHS
REACHcULus ListedcRUus RecognizedcETLus (Intertek)CEFCC Part 15RoHSREACH
The principal
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 have stood next to both. I studied economics and psychology at the University of Chicago, then went back to the work I actually knew.
Kestner is not a person. It is a name I picked because it sounds like the companies I grew up selling to — Grainger, Anixter, Avnet.
My given name is 尚烨. It happens to sound almost exactly like 商业 — the Chinese word for commerce. My parents deny doing this on purpose.
Shangye (Mike) LiPrincipal, Kestner Supply
Buyers can audit the plant behind their build — in China or Vietnam — by appointment. We do not charge for it, and we do not stage it.