Sourcing · Manufacturing
Most sourcing partners keep the factory anonymous. We don't — we come from the factory floor. Here are example plants we source through, the capabilities they run, and the standards behind every build: power out of China, and a China-plus-one line in Vietnam.
Two case studies in the plants we source through — shown so you can judge the standard we hold every supplier to: a power plant in China, and the Vietnam line we run for China-plus-one.
On the power side, we hold deep relationships with qualified lines in both China and Vietnam, running one drawing set — so you elect the country of origin, and nothing else about the build changes.
ChinaPrimary line
An example power plant we source through — magnetics winding, SMT, assembly, and test under one roof.
VietnamChina-plus-one
The China-plus-one line — the same drawings and the same UL file as the China plant, with a Vietnam country of origin. It's how buyers elect origin without qualifying a new supplier.
From the board to the box, the steps that matter happen on the lines we source through — which is why we can require the test data, warrant the product, and change the origin without changing the process.
SMT & reflow
Automated placement and reflow for control boards.
Magnetics winding
In-house transformer and coil winding.
AC/DC cord welding
Automatic soldering of AC and DC cords.
Injection molding
Housings, strain reliefs, and connector overmolds.
Wire processing
Cut, strip, crimp, and tin to your drawing.
Overmolding
Custom connector and strain-relief overmolds.
Potting & dispensing
Encapsulation for sealed and outdoor builds.
Aging & final test
100% ICT, hipot, and functional test.
Manufacturing floor
Equipment
Every build passes through an in-house test lab — electrical safety, efficiency, cable performance, and dimensional checks on calibrated equipment, not a subcontractor's word. It's the same data we hand you: UL file numbers, DoE efficiency figures, and continuity and hipot results.
The R&D bench is where custom work starts — a drawing or a target spec becomes a working sample, tested against your requirements before a production run. When you ask for something new, an engineer answers, not a salesperson.
The marks every build carries
cULus LISTED
cRUus REC.
cETLus
CE
FCC PART 15
RoHS
REACHManufacturing operates under ISO 9001:2015 · ISO 14001:2015 ·ISO/IEC 27001:2022 · TL 9000-H · QC 080000 HSPM · ESD S20.20 ·Amfori BSCI. Every mark is verifiable by file number on request.
The two plants above are only examples — we work with a broader set of factories across power and connectivity, each vetted the same way: a line walk, the test data, the mill certificates, and an approved sample before a single unit ships. So for a product these lines do not build, we do not hand you off — we source it through a factory we have already qualified. It is why “we can’t” is rare.
Example partner or wider network, the accountability does not move: you contract with Kestner, and Kestner warrants what ships.
Tell us what you needThe doors are open and the floor is real — but the contract is with Kestner: a US-based sourcing partner, one accountable contact, and China-plus-one built in, with this floor, this process, and these marks behind every order.