Power adapters undergoing automated testing on the production line.

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A power adapter, charger, and power supply manufacturer.

A power adapter and power supply manufacturer — AC/DC adapters, GaN chargers, and switching power supplies, standard SKUs or built to your voltage, connector, and enclosure. Built on our own lines in China and Vietnam, tariff- and origin-savvy, on one drawing set.

We build these ourselves.

0Factories · China + Vietnam
0Power units a day
0Final-tested, every unit
0Years building power

China + Vietnam origin — elect it to control your duty. Our core lines run in both countries on one drawing set, so you choose the country of origin, documented per unit, without requalifying the product.

See the duty by HTS code →

Request a quoteInside the factories →

Why source power from Kestner

We own the factories

We own two factories — one in China, one in Vietnam — and build power adapters, chargers, and switching power supplies on our own lines. We sell only what we inspect, warrant, and stand behind.

Custom power supply builds

Bring a drawing or a target spec. We build to your voltage, connector, and enclosure under the same UL file and DoE Level VI efficiency testing as our standard SKUs.

Choose your country of origin

We run one drawing set across our plants in both Vietnam and China, so you can elect the country of origin that fits your sourcing strategy — documented per unit.

One accountable US contact

You buy from a US-based company and reach a person who prices and owns the outcome, in US business hours.

The marks every build carries.

Product certifications on the label, the packaging, and the documentation your procurement team audits against — verifiable by file number on request.

cULus ListedcULus LISTED
cRUus RecognizedcRUus REC.
cETLus IntertekcETLus
CECE
FCC Part 15FCC PART 15
RoHSRoHS
REACHREACH

Manufacturing operates under  ISO 9001:2015 · ISO 14001:2015 ·ISO/IEC 27001:2022 · TL 9000-H · QC 080000 HSPM · ESD S20.20 ·Amfori BSCI

See how we source

Power — common questions

Are you a power adapter and power supply manufacturer, or a distributor?

We're the manufacturer. We build AC/DC power adapters, chargers, and switching power supplies on our own lines in China and Vietnam — standard SKUs and custom OEM builds — and back them with a US company. When a build needs a part we don't make ourselves, we source it to the same standard.

Can you build a custom power supply to our spec?

Yes. We build custom and OEM switching power supplies — AC/DC adapters, USB-C PD, and desktop or wall-mount units — to your voltage, connector, enclosure, and certification, under the same UL file as our standard lines.

Can you match or replace an existing power adapter?

Yes. Send the specs or a sample and we cross-reference an equivalent with the same output, connector, and safety marks for a drop-in replacement.

Do you make USB-C PD and GaN chargers?

Yes. GaN chargers from 30 to 140 W with USB PD 3.1, single and multi-port, plus fixed-output USB-C power adapters — standard or white-label to your housing and packaging.

What safety certifications do your power supplies carry?

UL 62368-1, DoE Level VI efficiency, and FCC Part 15 B as standard, with regional overlays (PSE, KC, BIS) and medical 60601 on request. Every mark is verifiable by file number.

What is the minimum order quantity and lead time?

Both depend on the product and how much is customized. Send your spec and target volume and we will quote MOQ, lead time, and price together.

Request a quote

Tell us what you need in power — standard or custom. A person answers, usually within one business day.

What do you need?

Prefer email? rfq@kestnersupply.com reaches the same person.