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{{Short description|Type of power rectifier}}
[[File:Selenium Rectifier.jpg|thumb|An 8-plate 160 V 450 mA Federal brand selenium rectifier|224x224px]]
A '''selenium rectifier''' is a type of [[metal rectifier]], invented in 1933.<ref>{{Cite book|last1=Hempstead|first1=Colin|url=https://books.google.com/books?id=2ZCNAgAAQBAJ&dq=selenium+rectifier+invented&pg=PA669|title=Encyclopedia of 20th-Century Technology|last2=Worthington|first2=William|date=2005-08-08|publisher=Routledge|isbn=978-1-135-45551-4|pages=669|language=en|quote=selenium rectifiers, which were invented by Charles E. Fitts in 1933}}</ref> They were used in [[power supply|power supplies]] for electronic equipment and in high-current battery-charger applications until they were superseded by [[silicon diode]] rectifiers in the late 1960s. The arrival of the [[alternator (automotive)|alternator]] in some automobiles was the result of compact, low-cost, high-current silicon rectifiers. These units were small enough to be inside the alternator case, unlike the [[selenium]] units that preceded silicon devices.
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