Cosel is one of the leading power supply manufacturers with a history of 50 years. Cosel manufactures high-quality AC-DC power supplies, DC-DC converters, power modules and EMI filters.

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Cosel is one of the leading power supply manufacturers with a history of 50 years. Cosel manufactures high-quality AC-DC power supplies, DC-DC converters, power modules and EMI filters.

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Cosel's Strength

What makes Cosel power supplies a top choice and highly trusted by customers worldwide?

With a 50-year track record as a professional switching power supply manufacturer, Cosel has established a strong presence in industries like medical, semiconductor equipment, industrial automation, communications, and railways. Here's why:

  • High-quality, extensive product lineup
  • Proactive customer support
  • Cutting-edge technology

Find the most suitable power supply

Extensive Product Lineup

We offer a wide range of standard products—110 categories, 478 sub-categories, and 22,292 models (as of January 2024).
Based on your requirements for size, cost, and application, combined with 380 optional parts, we can provide the most suitable product solution. If our standard products do not meet some of your needs, Cosel offers modification solutions.

  • Enclosed Type
    Power Supply

    39 Classes / 162 Sub-Classes /
    16,539 Models
    360 Optional parts

  • On-board Type
    Power Supply

    44 Classes / 163 Sub-Classes /
    3,947 Models
    20 Optional parts

  • EMI Filters

    27 Classes / 153 Sub-Classes /
    1,806 Models

Our products place a high emphasis on reliability, both in component selection and overall design

  • Enhanced Sulfuration Resistance: We strengthen the anti-sulfuration performance of our components. This reduces failure rates, even in equipment with high sulfur content.
  • Key Components' Lifespan: Critical components like electrolytic capacitors and fans undergo individual lifespan testing. We focus on the expected lifespan of each during the design phase.

Equipment Highlights

  • X-ray Fluorescence Analyzer

    X-ray Fluorescence Analyzer

    Ensures that the chemical composition of components complies with relevant regulations.

  • PCT Tester

    PCT Tester

    Conducts highly accelerated lifespan tests on parts used in new products.

  • Automated Test System

    Automated Test System

    Automatically inspects and confirms the characteristics of new products.

Provide various support

Proactive Customer Support

While we strive to develop high-quality products, we are also committed to working closely with you to tackle any challenges, from product selection to mass production and post-sales support

  • Engineer on-site visits: Our engineers will visit you to offer personalized assistance.
  • EMI Testing Assistance: We provide support for Electromagnetic Interference (EMI) testing.
  • Anechoic Chamber Use: Access to anechoic chambers for accurate testing.
  • EMI and Peripheral Circuit Design Support: Guidance on designing EMI and peripheral circuits.
  • Circuit and Modification Design Advice: Recommendations for circuit modifications and redesigns based on your specific needs.

In the event of any product issues, we will conduct thorough testing and analysis, providing detailed analysis reports to help you resolve the problem efficiently

Equipment Highlights

  • Anechoic Chamber

    Anechoic Chamber

    Confirms EMI characteristics

  • X-ray CT Diagnostic Equipment

    X-ray CT Diagnostic Equipment

    Observes the internal condition of components during failures

  • Microscope

    Microscope

    Detects scratches and measures shapes in micron units

Delivering peace of mind backed by our advanced technological capabilities

High-Quality Technical Capabilities

Cosel's core philosophy is quality first, and it is consistently dedicated to product research and development. At our R&D center, over 250 engineers are engaged in developing high-quality products and providing customer support

R&D Center

R&D Center

Consistent Commitment to Improvement

  • Continuous Improvement Awareness: Quality control activities are conducted throughout the company to foster a mindset of proactive improvement
  • Gold Award at the JHS All Japan Selection Quality Control Circle Conference (2020)
  • Multiple Ishikawa Kaoru Awards for quality control advancement

Leave all your worries about switching power supplies behind with Cosel!

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