What is the KC mark and who governs it?

KC, short for Korea Certification, is the unified Korean conformity mark introduced in 2009. It groups under a single logo the older sectoral marks (KCC for radio communications, KS for electrical safety, and others). On the radio side the competent authority is the RRA (Radio Research Agency, 국립전파연구원), a technical agency under the MSIT (Ministry of Science and ICT, 과학기술정보통신부). For electrical safety and EMC outside radio, the authority is KATS (Korea Agency for Technology and Standards, 국가기술표준원), under the Ministry of Trade, Industry and Energy (MOTIE).

What are the three KC certification routes?

The RRA distinguishes Certification of Conformity (강제 인증), the full mandatory procedure for radio and most consumer electronics; Registration of Conformity (적합등록), a self-declaration filed after lab testing, reserved for lower-risk radio devices; and Interim Certification (잠정 인증), a transitional route for new technologies that do not yet have a dedicated Korean standard. The applicable route is dictated by the product classification, not by the manufacturer's preference.

Can a CE or FCC test report be reused for KC?

As a rule, no. South Korea has signed few mutual recognition agreements, and the existing MRAs remain partial and conditional (for instance bilateral arrangements with the United States covering limited radio categories). In practice, most products are retested in a Korean accredited lab, because frequency plans, power limits and test protocols differ. See also [parallel EU and US certification](/en/guides/eu-us-dual-certification/).

Why is a local representative mandatory?

A foreign manufacturer cannot file a KC dossier directly. The filing and follow-up (correspondence with RRA or KATS, document retention, change management) must go through a representative resident in Korea. The representative may be a Korean distributor, a local subsidiary, or a third-party certification agent. The role carries legal responsibility: the representative is the authority's official point of contact.

What are the specifics of product labelling?

The KC label combines the KC logo and the certification number issued by RRA or KATS. Position, minimum size and contrast are normalised. Mandatory label information (model name, manufacturer ID, importer ID where applicable) must appear in Korean characters when the product is sold to consumers. English-only labelling is a recurrent reason for rejection during market surveillance on consumer products.

Is KC transferable from CE or FCC certification?

No. A product fully certified CE under RED and FCC under Part 15 still has to go through the KC route: Korean frequency declaration, testing in a Korean accredited lab, filing by a local representative, Korean labelling. The existing CE / FCC technical file can be reused internally to prepare the KC dossier, but the certificate, its number and the labelling remain Korea-specific.

Are Korean frequency bands identical to EU or US bands?

No. Korean frequency plans, published by RRA Notifications, differ in power limits and usable sub-bands. 5 GHz Wi-Fi is open on a subset of channels, BLE is constrained by EIRP limits that do not match FCC Part 15 or ETSI EN 300 328. An incorrect band declaration is a frequent ground for rejection at certification and for removal under market surveillance.

How long does full KC certification typically take?

Qualitatively, several weeks between handing samples to the Korean lab and issuance of the certification number, excluding test iterations and document translation. Actual lead times depend on lab backlog, the number of radio modes to be tested and the completeness of the dossier filed by the local representative. See [certification timeline](/en/guides/certification-timeline/) for cross-cutting orders of magnitude.

KC mark: product certification in South Korea

Author Hugues Orgitello Last updated 26 May 2026

Guide · KC, South Korea

The KC mark (Korea Certification) is the unified Korean conformity mark. It covers radio, electromagnetic compatibility and electrical safety for most products placed on the South Korean market. For a foreign manufacturer, KC is among the most demanding entry points in the Asia-Pacific region: limited recognition of foreign test reports, testing usually repeated in a Korean accredited lab, labelling in Hangul, and the obligation to designate a representative resident in Korea. This page describes the origin and governance of the mark, the three certification routes, equipment classes, marking and frequency-band rules, and the recurring pitfalls for products already certified to CE and FCC.

Origin and scope of the KC mark

The KC mark was instituted in 2009 by merging the earlier sectoral marks. Before 2009, the visible marks included KCC, run by the Korea Communications Commission (KCC) for radio and telecoms, the KS mark for electrical safety run by the standards agency, and other sector-specific marks (energy, industrial electrical equipment). The 2009 unification grouped these logos under a single one, KC, while preserving the underlying technical regimes and their respective authorities.

The unification logic is purely graphical and administrative: a complete product (for instance a Wi-Fi module embedded in a consumer device) can fall in parallel under the radio regime (RRA authority) and the electrical safety regime (KATS authority). The KC logo appears once, but the underlying certificates can come from two different authorities, each with its own number and procedure.

Authorities and reference texts

Authority	Scope	Parent ministry
RRA (Radio Research Agency, 국립전파연구원)	Radio, telecoms, transmitter-receiver equipment	MSIT, Ministry of Science and ICT
KATS (Korea Agency for Technology and Standards, 국가기술표준원)	Electrical safety, EMC outside radio, consumer products	MOTIE, Ministry of Trade, Industry and Energy

The reference text for radio is the Radio Waves Act, supplemented by RRA Notifications, technical publications that detail testing requirements and frequency plans. For safety and EMC outside radio, the reference framework is the Korean Industrial Standards (KS), most of which are aligned with IEC or ISO standards but carry Korean national amendments.

Three certification routes

The RRA distinguishes three main regimes for radio, and KATS follows analogous logic for safety.

Certification of Conformity (강제 인증)

Full mandatory procedure, applicable to radio, transmitter-receivers and most consumer products with significant risk. The manufacturer (through its local representative) files a complete dossier with the RRA, including test reports from an accredited laboratory. The RRA reviews the dossier, may request additional testing, and issues a certification number that must appear on the product.

Registration of Conformity (적합등록)

Registration regime on self-declaration, applicable to lower-risk radio devices (low power, restricted use case, open bands). Testing must still be performed in a Korean accredited lab, or in a lab recognised under MRA, and the report is retained by the local representative. The registration is notified to RRA without full technical review: responsibility stays with the manufacturer. The regime is closer to an administrative notification than to certification proper.

Interim Certification (잠정 인증)

Transitional procedure for new technologies not covered by an existing Korean standard. The RRA reviews the product case by case, sets time-bounded conditions of use, and issues a provisional certificate valid for a fixed period (renewable if the regulatory situation has not evolved). This route is used for products such as some new-generation Ultra-Wideband modules, or emerging wireless technologies awaiting a dedicated RRA Notification.

Route	Main actor	When to use it	RRA review depth
Certification of Conformity	RRA	Standard radio and higher-risk consumer products	Full dossier review
Registration of Conformity	Local representative	Lower-risk, low-power radio	Administrative notification
Interim Certification	RRA	Technology without a Korean standard	Case-by-case review

Equipment classes and EMC

The Korean EMC regime preserves the classic CISPR distinction between equipment intended for residential use and equipment intended for industrial use.

Class	Intended environment	Emissions logic
Class A	Industrial, non-residential environment	Less strict limits, explicit "Class A" marking mandatory
Class B	Residential, urban environment	Stricter limits (proximity to broadcast receivers)

A consumer product is classified B by default. A Class A product may be commercialised but must carry, on the label and in the manual, a notice informing the user that it is not suitable for a residential environment. The distinction is analogous to EN 55032 on the EU side and to the FCC distinction between Class A and Class B on the US side, but the numerical limits do not always coincide.

Korean labs and mutual recognition

The distinguishing feature of Korean certification is the near-systematic use of a Korean accredited laboratory.

Korea has signed a limited number of mutual recognition agreements (MRAs). The most visible are partial bilateral arrangements with the United States (FCC) covering some radio categories, under conditions that remain restrictive. The European Union does not hold a general MRA transposable to KC. In practice, a European manufacturer should plan for a new test cycle in Korea for the vast majority of wireless products.

This applies to:

radio tests on Korean bands (Korea-specific frequency plan),
EMC (the method is close to CISPR but foreign test reports are not automatically accepted),
electrical safety for consumer mains-powered products (KATS regime, KS standards aligned with IEC but with national amendments).

A European or US lab report is not useless: the Korean lab uses it to frame its own tests and pinpoint sensitive areas, sometimes shortening the empirical phase by skipping configurations already known to be clean. But it does not substitute for the Korean report when filing with RRA or KATS. The official dossier must rest on a test campaign run by a lab listed in the Korean accreditation database, with traceable equipment calibration, signed by a Korean test engineer, and structured to match the RRA Notification covering the relevant product category.

A second consequence is operational. Sample shipment to Korea, customs clearance, on-site debugging, and possible firmware revisions during the test campaign require coordination between the manufacturer, the Korean lab and the local representative. Manufacturers used to remote testing in EU or US labs frequently underestimate the iteration cost when a non-compliance is found mid-campaign, especially when the firmware engineer is in a distant timezone.

The local representative, a structuring obligation

A foreign manufacturer cannot file a KC dossier directly. The filing and follow-up must go through a local representative resident in Korea, who carries several duties:

act as the official point of contact for RRA and KATS, receive correspondence and respond within prescribed deadlines,
retain the technical file and test reports for the prescribed duration,
declare any material change to the product that could invalidate the certification,
ensure traceability in case of incident, recall, or market-surveillance request.

The representative can be:

the official Korean distributor of the product, when one exists and accepts this duty,
a local subsidiary of the manufacturer, if legally constituted in Korea,
a specialised certification agent, paid specifically for this function (the usual model for manufacturers without an existing Korean commercial presence).

The absence of a designated representative is an immediate ground for dossier rejection. The choice of representative is not neutral: their responsiveness conditions the review timeline and their financial robustness conditions their ability to carry obligations across the product life cycle.

Marking and labelling

KC marking follows precise rules of form and content, set out by RRA and KATS notifications.

Mark composition

KC logo, in a normalised geometry (fixed proportions, minimum contrast with the background, minimum size depending on product surface),
Certification number issued by RRA or KATS, immediately readable next to the logo,
Mandatory information: model name, manufacturer identifier, importer or local-representative identifier when the manufacturer is foreign.

Label language

End-user information (commercial name, warnings, safety instructions) must appear in Korean characters (Hangul, 한글) on the label and in the manual supplied with the consumer product. An English-only label is tolerated for some professional equipment but is a recurrent ground for rejection on consumer products. Korean text may coexist with an English version, as long as the Korean version is present and legible.

Position and legibility

The mark must be permanently affixed, visible without disassembly, and readable without magnification under normal use. For products too small to carry the full mark, a waiver allows part of the marking to be moved to the packaging and documentation, on the condition that the KC logo and certification number appear on at least one of the two physical supports.

Korean frequency bands

Korean frequency plans are published by RRA Notification. They differ on several points from EU and US plans.

Band	EU (ETSI)	US (FCC)	Korea (RRA)
2.4 GHz ISM	EN 300 328, up to 100 mW EIRP	Part 15.247, up to 1 W conducted	Dedicated RRA Notification, limits close to ETSI
5 GHz Wi-Fi	EN 301 893, extended U-NII	Part 15 U-NII-1/2/3	Subset of channels open, more restrictive than EU and US
BLE	Under EN 300 328	Under Part 15.247	Specific EIRP limits, check by Notification
LTE / 5G	3GPP bands harmonised in EU	FCC bands	Korea-specific bands (Band 5, partial Band 7, etc.)

The practical consequence: a band declaration copied from an ETSI or FCC dossier does not pass as is. Firmwares must be configurable to respect the Korean frequency plan, and the test report must show that the product stays within RRA limits across the entire declared band. A module that automatically selects channels based on a regulatory domain table must include a Korean entry, properly populated, and the production firmware loaded on the certified samples must match the firmware shipped on commercial units. Any mismatch between the regulatory database used during testing and the database used in production is a recurring source of post-certification non-conformities.

For cellular products, there is an additional operator-approval step (notably SK Telecom, KT, LG U+), distinct from the KC certification proper and closer in logic to PTCRB on the US side. See PTCRB for the general cellular homologation mechanism.

Step-by-step procedure

Without committing to a precise schedule, the typical sequence for a foreign manufacturer tackling KC for the first time is as follows.

Freeze product specifications (hardware, firmware, antenna, accessories) and identify the applicable regimes: radio (RRA), EMC, electrical safety (KATS). A single product can fall under both authorities.
Designate a local representative resident in Korea, under a written contract. Without a representative, no filing is possible.
Identify the applicable route among the three: Certification of Conformity (general case), Registration of Conformity (lower-risk radio), Interim Certification (technology without a Korean standard).
Map the applicable Korean standards (Korean Industrial Standards and RRA Notifications), comparing against the EU and US standards already applied. Identify deltas.
Select a Korean accredited laboratory for the tests required by RRA and KATS. Agree on the test protocol and schedule.
Prepare samples in the series-production configuration, with frozen firmware and complete accessories, and ship them to Korea (customs handled by the representative or the lab).
Run tests in the Korean lab, against the Korean frequency plan and power limits, against the Korean EMC limits, and against electrical safety where applicable.
Compile the technical dossier in Korean or bilingual form (schematics, BOM, antenna plan, band declaration, user manual in Hangul).
File the dossier through the local representative with RRA and, where applicable, KATS. Respond to any clarification requests.
Receive the certification number, integrate it into the product marking, validate the final label, start series production.
Maintain the certification: change management on hardware or firmware, dossier retention by the representative, refresh if a new RRA Notification supersedes the certified baseline.

KC, CE and FCC: what does not transfer

The comparison routinely asked for by product teams that come to KC after handling CE and FCC.

Criterion	CE (RED)	FCC (Part 15)	KC (RRA / KATS)
Scope of the mark	Conformity to several directives, including RED for radio	Radio conformity (Part 15, Part 22, etc.)	Unified mark: radio (RRA) + EMC + safety (KATS)
Foreign test-report transferability	Reuse possible across accredited EU labs	Reuse possible across recognised labs	Near zero, tests usually repeated in a Korean lab
Required laboratory	Lab accredited in the EU (or MRA-recognised)	FCC-recognised lab (TCB for Part 15)	Korean accredited lab in the vast majority of cases
Label language	Language of the member state of placing on the market	English	Hangul for consumer-facing information
Local representative	EU authorised representative if manufacturer outside EU	FCC agent on behalf of the grant holder	Resident representative in Korea, mandatory
Product identifier	Notified Body number (where applicable)	FCC ID	KC certification number issued by RRA or KATS
Self-declaration possible	Yes for module A and some combined modules	DoC for some equipment	Registration of Conformity, lower-risk radio only

The table summarises the classic mistake: a product fully certified CE and FCC should be treated, for Korea, as not certified. The existing dossier accelerates internal preparation, but the certification proper starts again. See CE vs FCC for the EU vs US comparison, which share more mechanisms.

Common pitfalls

Pitfall	Consequence
Submitting a CE or FCC report to RRA assuming it will be accepted	Dossier rejected, new tests required in a Korean lab
Designating the local representative late in the project	Filing blocked, industrialisation delayed, weaker negotiation position
Declaring a band plan copied from ETSI or FCC	Non-compliance with RRA Notifications, certification refused
Labelling a consumer product in English only	Rejection in market surveillance, commercial withdrawal
Changing radio firmware after certification without refiling	Certification number invalidated, exposure to recall
Underestimating the Class A / B EMC choice (industrial vs residential)	Product positioning incompatible with the distribution channel
Confusing the KC mark with operator homologation (cellular)	Product KC-certified but unusable on SK Telecom, KT or LG U+ networks without the extra step
Selecting the local representative on price alone	Insufficient responsiveness to RRA clarification requests, schedule slippage