Product Compliance And Certification For Power Supply In South Korea

Scope and evidence must be confirmed before any paid tests or filings.

Define the power-supply product before selecting a Korean route

A “power supply” may mean an AC/DC wall adapter, desktop brick, internal PC supply, DC/DC converter, battery charger or power bank. Those labels are not interchangeable legal classifications. In South Korea, evaluate the actual circuit, sale configuration and intended use before ordering KC tests.

For an ordinary separately sold mains-powered AC/DC adapter, investigate three independent layers: KATS electrical-product safety, RRA electromagnetic compatibility (EMC), and KEA adapter/charger efficiency. Other constructions can change this stack; no single KC mark or overseas certificate automatically resolves all three.

Freeze these facts in a one-model classification sheet. A catalogue name alone is insufficient:

Input: AC or DC, voltage/frequency range, plug or cord, and whether the mains connection is accessible.
Output: fixed or USB-PD variable voltage, maximum current/wattage, number of outputs and charging function.
Construction: enclosed external supply, open-frame/internal module, DC/DC-only board or supply incorporated in a host product.
Destination: separately retailed, bundled with an identified host, OEM component, industrial-only or research sample.
Identity: legal manufacturer, factory, Korean importer, model/variants, schematics and bill of materials.

Product-specific regulatory decision matrix

Regulatory layer	Trigger and regulatory distinction	Immediate classification / release gate
Electrical safety — KATS	Where the exact model falls in controlled electrical-goods categories, Korean law assigns safety certification, safety confirmation or supplier conformity according to the prescribed category. Do not select a route from the retail term “power supply” or from another manufacturer’s historical KC certificate: match the present product, construction and sale mode to the current lists.	Match construction and intended use to current prescribed category/annex and KC safety standard; obtain the required model-level evidence and approval/filing before the applicable release/import gate.
EMC — RRA	RRA answered that a 220 V AC → 12 V DC / 5 A DC supply falls within the Radio Waves Act conformity-registration scope (20 February 2025). Other designs require their own assessment.	Determine RRA equipment classification and conformity-assessment mode; arrange applicable emissions/immunity evidence and registration before manufacture, sale or import if covered.
Energy — KEA	KEA explicitly lists adapters and chargers under energy-efficiency management. The regulation uses minimum-energy-performance criteria for this category, not automatically a consumer 1–5 grade for every adapter.	Check current adapter/charger definition, rated output and exclusions in the applicable notice; confirm MEPS testing, product reporting and correct prescribed efficiency information for the exact variant.
Product/sector overlay	A battery-containing bank, LED driver, medical/industrial supply, wireless-enabled charger or complete host may fall under further or different product-specific rules.	Separate the bare supply from host, battery, plug/cord and any radio function; obtain specialist classification rather than extending an ordinary adapter result.

KEA’s published adapter/charger scope is narrower than the everyday term “power supply”: it describes external AC/DC or AC/AC units, adapters with the same simultaneously delivered output voltage and total nameplate output of no more than 150 W, and external chargers incorporating a lithium-ion battery-charging function with rated input power of no more than 20 W. It excludes units dedicated to certain specialised applications, including broadcasting, medical, lighting, measuring and surveillance. A 65 W USB-PD adapter, a multi-output unit and a 200 W supply therefore cannot be classified solely by their retail names: compare operating modes, output arrangements and purpose with the published KEA scope and the current applicable notice. Being outside this KEA category does not itself remove KATS or RRA duties.

Do not confuse sources of authority: statutory categories and current notices establish applicability; an assigned KC safety standard provides test criteria, not a stand-alone market authorization. The RRA example from 2025 addressed the Radio Waves Act only and did not decide KATS safety or KEA efficiency.

Evidence package for one power-supply model

Build a single evidence index but maintain separate safety, EMC and energy conclusions. KATS describes technical files for safety applications; the list below converts those into a power-supply release dossier, not a claim that every item is a mandatory filing for every route.

Product photos and nameplate artwork: input/output ratings, model, connector, plug/cord, warnings and Korean-market packaging.
Circuit diagram, BOM and critical-component certificates; transformer/insulation, PCB materials, enclosure, fuses and protective devices.
Safety analysis and relevant test evidence for the selected KC standard (KC 62368-1 may be relevant for AV/ICT equipment; it is not universal for every charger).
RRA equipment classification, EMC reports/registration identifier or a documented reason that a category does not apply.
KEA adapter/charger scope decision, active-mode efficiency/no-load data where prescribed, report/registry evidence or documented out-of-scope basis.
Factory and applicant details, importer responsibilities, approved model variants and traceability linking each report to the sold SKU.

Marking, responsible parties and market-release gates

Treat the three regimes as parallel workstreams with one common version of the product. For a covered unit, do not use a CE, FCC or IECEE CB file as a substitute for a Korean legal decision or registration.

Keep the legal gates distinct. KATS states that prescribed safety markings for covered products must be applied before domestic dispatch or, for imports, before customs clearance; its guidance identifies the KC mark, applicable approval/declaration number, model, manufacturer/importer, production identification and a usable Korean after-sales contact, subject to route-specific rules. Separately, KEA’s programme guidance describes reporting covered models within 90 days after efficiency measurement. That reporting period is not a general 90-day permission to market an unassessed unit. Check the effective notice and the exact labelling/reporting point for the SKU before release.

Classify the finished SKU against current KATS annexes, RRA categories and KEA adapter/charger scope. Escalate ambiguous cases to the relevant authority or authorized body.
Freeze the tested sample and technical specification, including Korean plug/cord and charger operating modes.
Complete the applicable safety certification/confirmation or supplier route; independently close RRA EMC and KEA efficiency obligations.
Verify each required KC indication, registration/certificate number, rated information, warnings and any efficiency disclosure against the actual model and packaging; review Korean-language particulars where required.
Before release for import or sale, close all applicable safety, RRA and marking gates and confirm KEA minimum efficiency and any required label. Track the separate KEA post-measurement reporting deadline against the governing rule; neither assume all reports are necessarily due at customs nor regard 90 days as permission to sell noncompliant goods. Retain change and surveillance records.

Changes that can reopen conformity assessment

A certificate for an earlier version is not proof that a modified supply is covered. Reopen the classification whenever a change alters the tested electrical or commercial identity:

New transformer, protection circuit, PCB layout or insulation system → safety review; EMC retest may also be necessary.
Different switching frequency, cable/connector, enclosure, output power or USB-PD profile → RRA and, where applicable, efficiency/test-family review.
New manufacturing site, importer, model designation or bundled host → verify variation/notification rules and whether the old approval still covers the exact Korean SKU.

What this page does—and does not—classify

This is the cross-regime route map for a Korean power supply, not a general KC filing tutorial. A unit containing cells is not merely a power supply; consult the separate Korean power-bank analysis. US and EU approvals may support engineering evidence but have their own market-entry rules.

Korean power-bank compliance · US power-supply compliance · EU power-supply compliance

Official Korean sources

Start with these official primary resources; check the currently effective annex and notice on the filing date, particularly after changes to a model or efficiency rules.

Power-supply questions before launch

Is KC safety certification alone enough for a 220 V AC/DC adapter?

No. Confirm the safety category and separately assess RRA conformity registration and KEA adapter efficiency. RRA specifically classified a 220 V AC to 12 V/5 A DC supply as registration-scope equipment; safety approval does not resolve that obligation.

Does every external adapter need a Korean 1–5 energy-grade sticker?

Do not assume so. Adapters/chargers are a listed KEA efficiency category, but the applicable regulation treats them under minimum performance requirements. Confirm the current product definition and prescribed mark/information for that SKU; never substitute a generic grade sticker.

Can an imported adapter use its manufacturer’s existing Korean approval?

Possibly only if the exact model, responsible entities, factory, ratings and variations match the valid Korean record and any required importer formalities are satisfied. Verify in the official register and with the certificate holder or body before shipment.

Is a DC/DC-only module identical to a mains wall charger?

No. Its input, installation, accessibility and end-use are different classification facts. RRA, safety and energy scope must be assessed separately; do not copy the wall-adapter route.

What changes when the adapter ships with a power bank or a wireless host?

Evaluate the adapter and the bundled/battery or wireless device independently and as supplied. Battery and radio requirements may add routes; one certificate for the adapter does not cover the bank or radio module.