Cosel

What Cosel does

Cosel Co., Ltd. is a Japanese designer and manufacturer of high-performance AC-DC power supplies, DC-DC converters, and EMI filters, founded in 1969 and headquartered in Toyama-shi, Japan. The company is publicly listed on the Tokyo Stock Exchange (tyo:6905) and employs between 501 and 1,000 people. Its product portfolio spans switching power supplies in every major form factor (enclosed, open frame, DIN rail, configurable, PCB mount, and bus converter/power module types) alongside low-profile and book-type EMI filters, organized into branded series including GHA, MU, HFA/HCA, and TE. Cosel serves industrial equipment OEMs across factory automation and test & measurement, medical, alternative energy, communications, and (via its Powerbox subsidiary in Sweden) defense and aerospace applications requiring MIL-STD-1275/704/461G/810H compliance, such as the ECDD series of rugged IP65-rated DC/DC converters.

Cosel generates revenue primarily through direct hardware sales of switching power supplies and EMI filters to industrial OEMs, complemented by technical support services (design tools, application guides, sample programs, troubleshooting, and FAQ). Pricing is quote-based and not publicly disclosed. Go-to-market is sales-led, combining a corporate website, catalog site, the COSEL+ technical information portal, the COSELSYNC collaborative brand platform, and direct inquiry forms. The company distributes LITEON power supply products as a channel partner and operates an ePLAN engineering data portal integration to embed its components in customer CAD workflows. Ownership includes the wholly-owned Powerbox subsidiary (Stockholm, Sweden), which specializes in ruggedized defense and industrial power conversion and recently launched the ECDD series. Cosel maintains an active investor relations function with consolidated financial reporting, ESG disclosures aligned to TCFD, and a separate sustainability governance structure, consistent with its status as a long-established public Japanese industrial company.

Name

Cosel

Legal name

COSEL Co., Ltd.

Website

https://en.cosel.co.jp

Company type

Public

Founded year

1969

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Cosel designs and manufactures high-performance AC-DC power supplies, DC-DC converters, and EMI filters for industrial OEMs in factory automation, medical, alternative energy, communications, and defense applications, selling globally through direct sales and the Powerbox subsidiary.

Ownership category

akta.pro rank

Product category

Industrial Power Supplies

NAICS

Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing (334416), Electrical Equipment Manufacturing (33531)

SIC

Electrical Industrial Apparatus (3620), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

DC-DC Converters & Power Modules (Isolated/non-isolated, POL modules) (IMAGADAB)

akta.pro secondary industries

Power Quality & Conditioning (PFC units, active filters, voltage regulators, surge protection) (IMAGADAG), Industrial Control Cabinets & Power Distribution (Panels, Switchgear for Automation) (IMAHAHAK)

Keywords

• Switching power supplies
• DC-DC converters
• EMI filters
• AC-DC power supplies
• Industrial power conversion

Headquarters

HQ city

Toyama-shi

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Power Supply Hardware Sales: COSEL generates revenue through the sale of switching power supplies and EMI filters to industrial equipment manufacturers. The company sells various product types including AC-DC power supplies, DC-DC converters, enclosed units, open frame units, DIN Rail units, configurable units, PCB mount units, and bus converters/power modules.
2. Technical Support Services: The company provides technical support including design tools, application guides, sample programs, troubleshooting, and FAQ services that complement product sales.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels9 records

Core offering

COSEL designs, manufactures, and sells high-performance switching AC-DC power supplies, DC-DC converters, and EMI filters for industrial equipment. Its portfolio spans multiple form factors (enclosed, open frame, DIN rail, configurable, PCB mount, bus converter/power module) and serves factory automation, medical, communications, alternative energy, and defense applications. Through subsidiary Powerbox, it also offers MIL-STD compliant rugged DC/DC converters for mission-critical platforms.

Product overview

COSEL Co., Ltd. is a global manufacturer of switching power supplies and EMI filters established in 1969, serving industrial equipment markets including factory automation, medical settings, and communications. The company offers a comprehensive portfolio organized around core product categories: switching power supplies (available in AC-DC, DC-DC, enclosed, open frame, DIN rail, configurable, PCB mount, and bus converter/power module configurations) and EMI filters (low profile type and book type). The product lineup includes branded series such as GHA, MU, HFA/HCA, and TE, complemented by collaborative platforms like COSELSYNC and information resources through COSEL+. COSEL also distributes LITEON products and provides engineering tool integrations including ePLAN data portal access. The company operates through subsidiaries including Powerbox, with recent product launches targeting defense applications via the ECDD series rugged DC/DC converters.

Differentiator

Problem solved

Functional benefit

Brands

• COSELSYNC: Collaborative brand site for global power supply manufacturers
• COSEL+
• Powerbox (PRBX)

Products and services

• GHA Series Power Supplies High-efficiency switching power supply series designed for industrial applications requiring reliable power conversion. Targeted at industrial equipment OEMs seeking standard-form-factor supplies.
• MU Series Power Supplies Industrial-grade switching power supply series aimed at factory automation and test & measurement applications. Sold to industrial equipment manufacturers.
• HFA/HCA Series Power Supplies High-performance power supply series positioned for demanding industrial and medical applications, supporting OEM customers that require safety-certified supplies.
• TE Series Power Supplies Power supply series targeting industrial applications with specific performance requirements. Sold to industrial equipment manufacturers.
• High-SCCR EMI Filters EMI filters with high short-circuit current rating designed to protect industrial equipment from electrical noise and transients. Targeted at industrial OEMs.
• LITEON Products (Distributed by COSEL) Power supply products from LITEON carried and distributed by COSEL, expanding its portfolio with additional industrial power solutions. Sold to industrial equipment manufacturers.
• ECDD Series Rugged DC/DC Power Converters Rugged DC/DC converters designed for mission-critical defense and industrial applications on 28V platforms. Fanless, IP65-sealed, conduction-cooled design meeting MIL-STD specifications. Targeted at defense system integrators, heavy industrial platform builders, and unmanned systems manufacturers via Powerbox.

Quantifiable outcome

• ECDD series achieves up to 92% efficiency

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Three partnerships are on record, tiered core and minor.

• PowerboxcoreStrategic or Co-development PartnerPowerbox is a subsidiary of the Cosel Group based in Stockholm, Sweden. Powerbox operates as a power conversion company under the Cosel Group umbrella, recently launching the ECDD series of rugged DC/DC converters for mission-critical defense and industrial applications.
• LITEONminorChannel Partner/ Reseller/ DistributorCOSEL handles and distributes LITEON products, making them available alongside COSEL's own power supply products through their sales channels.
• COSELSYNC PartnerscoreStrategic or Co-development PartnerCOSELSYNC is a collaborative brand site for global power supply manufacturers, working together to advance power supply technology and standards.

Scale indicators2 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• RECOM Power: RECOM manufactures AC-DC and DC-DC converters plus EMI filters with comparable form-factor breadth, targeting industrial, medical, and rail markets — directly competing with Cosel's standard product lines.
• Vicor: Vicor specializes in high-density DC-DC converters and power modules — a direct technology peer for Cosel's bus-converter/power-module products in industrial and defense applications.
• Advanced Energy: Advanced Energy (which absorbed Artesyn/Emerson Network Power) competes directly in industrial, medical, and semiconductor power conversion including DC-DC converters and high-density AC-DC supplies with similar efficiency and certification demands as Cosel's portfolio.
• TDK-Lambda: TDK's industrial power-supply division is a direct competitor to Cosel in AC-DC and DC-DC converters and EMI filters for industrial, medical, and test & measurement applications, with overlapping form factors (DIN rail, enclosed, open-frame).
• XP Power: XP Power is a focused industrial AC-DC and DC-DC power-supply manufacturer serving medical, industrial, and semiconductor equipment — a near-identical go-to-market and product set to Cosel, with comparable form-factor breadth and certifications.

Broad incumbents

• Mean Well: Mean Well is a high-volume, broad-line standard power-supply manufacturer with strong global distribution — a price-aggressive incumbent competing with Cosel in DIN-rail and enclosed industrial supplies.
• Murata Manufacturing: Murata's power-electronics division produces DC-DC converters and PoL modules that overlap with Cosel's PCB-mount and bus-converter offerings, particularly for industrial and communications applications.
• Delta Electronics: Delta Electronics is a much larger diversified power and thermal management incumbent whose industrial power-supply business competes head-on with Cosel across factory automation, renewables, and communications infrastructure.

Emerging players

• Phoenix Contact: Phoenix Contact offers industrial power supplies and surge protection in DIN-rail form factors that overlap with Cosel's factory-automation product set, particularly for control cabinets and industrial networks.
• Bel Fuse: Bel Fuse manufactures power-conversion products (AC-DC, DC-DC) and magnetics for industrial, networking, and aerospace/defense applications — a meaningful adjacency to Cosel's Powerbox defense and industrial lines.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xtwitter.com/COSEL_Dengenkun
• YouTubeyoutube.com/channel/UCIefNSFvTMsHdBd30giIFiQ
• Facebookfacebook.com/COSEL.CS
• LinkedInlinkedin.com/in/%E3%83%87%E3%83%B3%E3%82%B2%E3%83%B3%E5%90%9B-cosel-67b092207
• Instagraminstagram.com/cosel_dengenkun

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Cosel