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.

A trusted brand of standard power supply manufacturer in Japan with number one market share. Why does Cosel have number one market share in Japan where the testing standard is stringent?A trusted brand of standard power supply manufacturer in Japan with number one market share. Why does Cosel have number one market share in Japan where the testing standard is stringent?
Ultra Wide Input
DC-DC Converters
120W DC-DC Converter Module in 1/16 brick - CHS Series Makes Space for More Components on Smaller Size PCB120W DC-DC Converter Module in 1/16 brick - CHS Series Makes Space for More Components on Smaller Size PCB
CBS to CHS Cross Chart
Medical Power Supplies from COSEL (IEC60601-1).Ultra Low Failure Rate (＜30ppm)Medical Power Supplies from COSEL (IEC60601-1).Ultra Low Failure Rate (＜30ppm)
Medical Power Supply

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Cosel is a leading standard power supply manufacturer from Japan where the testing standard is stringent and has proven to be a trusted power supply manufacturer with the following attributes:

High Reliability by Unique Evaluation Techniques
We have been collaborating with the components’ manufacturers to establish a manufacturing and designing style that enables the components to work longer. We only use industrial-grade components that meet Cosel’s unique testing standards such as “Oil Bath Test.”
Confidence in Our High Quality Product（5-10 Years Warranty）
Manufacturer of long lifetime, high efficiency, and environment-friendly power supplies with ISO9001/14001 certification.
On-site Techincal Support
Our engineers visit the site to solve your technical issues.
Trustworthy Analytical Ability
If our product has any problem, we will analyze the defective product to determine the root cause of the problem and provide countermeasures to resolve it.
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