Wetting current
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In electrical engineering, a wetting current (or sealing current) is the minimum current needing to flow through a newly-closed mechanical switch or relay in order to break through any film (contact oxidation) that may have been deposited on the switch contacts while open. The film (contact oxidation) occurs often in areas with high humidity.
The alternate spelling whetting current is also used. This spelling implies that the origin of the word may be to whet the contacts which means to sharpen or make keen.
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