An enclosure is formed of an outer case and a lid. The outer case includes a first projecting strip portion provided on a top face side of the outer case and on an outer peripheral portion defining an opening, and extending to project outwardly from the outer case, and the lid includes a second projecting strip portion provided at a position facing the first projecting strip portion. With the opening of the outer case closed with the lid, the first and second projecting strip portions make close contact with each other along a direction in which these portions extend. This structure can protect the inside from an external factor such as rainwater or dust.

 
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> Two-way DC-DC converter

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