Normally-Closed Contacts for Stop Buttons
You may know the difference between normally open and normally closed contacts, but do you know where to use them? This article will teach you where to use normally open...
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Sink or Source? Normally Open or Normally Closed?
We discuss about concepts of Sink or Source used in electrical circuits or in PLC wiring. Also we deal with basics of normally open contact or normally closed contact which...
Switch Types and Common Terminology
Overview Learn about switch basics, including the pole and throws naming convention, normally open (NO) and normally closed (NC) terminology, different switch topologies, and types of switches such as electromechanical...