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Wikipedia definition
1. ContactorIn semiconductor testing, contactor can also refer to the specialised socket that connects the device under test. In process industries a contactor is a vessel where two streams interact, for example, air and liquid. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. A contactor is controlled by a circuit which has a much lower power level than the switched circuit.
Read “Contactor” on English Wikipedia
Read “接触器” on Japanese Wikipedia
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