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 is dedicated to powering your success with high-quality power supplies, rigorously tested to meet stringent Japanese standards. Here’s how we ensure your satisfaction:

Exceptional Reliability with Innovative Evaluation
We collaborate closely with component manufacturers to design and produce power supplies that last longer. Our unique testing methods, including the “Oil Bath Test,” ensure only the best industrial-grade components are used.
Confidence in Quality with Long-term Warranties
Our products, certified with ISO9001/14001, are known for their long lifespan, high efficiency, and eco-friendliness. We stand by our quality with warranties ranging from 5 to 10 years.
Proactive On-site Technical Support
Our expert engineers are available to visit your site, addressing and resolving any technical issues promptly, ensuring minimal downtime.
Reliable Problem Resolution
If an issue arises, we conduct thorough analyses to identify the root cause and provide effective solutions, ensuring your operations continue smoothly.

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