Â©Copyright 2004 - 2015 Meaning-of-Names.com-Powered by Swigity, LLC Meaning of Niemann Last Name-Surname-Family Name Niemann.Copyright 2004 - 2015 Meaning-of-Names.com-Powered by Swigity, LLC Meaning of Niemann Last Name-Surname-Family Name Niemann.
open - of a set; containing points whose neighborhood consists of other points of the same set, or being the complement of an open set; of an interval; containing neither of its end points.
A normally open (N.O.) contact is a contact that is open or in a non-conductive state when it, or the device operating it, is in a de-energized or relaxed state. An example of a normally open contact usage is the common household light switch.