Circuit diagram - Wikipedia OverviewSymbolsOrganizationArtworkEducationA circuit diagram is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations. The presentation of the interconnections between circuit components in the schematic diagram does not necessarily correspond to the physical arrangements in the finished device. Unlike a block diagram or layout diagram, a circuit diagraSee more on enpedia · Text under CC-BY-SA license What does NC mean in this pinout diagram for an ESP8266? \$\begingroup\$ This is a circuit diagram for a development board that the chip is mounted on. It may very well be that that's what the NC is referring to in the PDF I am referencing, but presumably it is connected to circuitry inside the ESP8266. \$\endgroup\$ – Octopus Dec 23 '15 at 2:34 switches - Can you clarify what an 1NO1NC switch is Can you clarify what an 1NO1NC switch is? Ask Question Asked 7 years, 7 months ago. NC = Normally closed (closed = short circuit = creating a path for the current) C = Common Here's a simple schematic diagram of a 1NC1NO switch. DOL STARTER CONTROL DIAGRAM - Engineering portal Nc(normally closed) Magnetic contactors:- magnetic contactors is an electrically controlled switch used for switching a power circuit similar to relay except with higher current rating. A contactor is controlled by a circuit which has much lower level than the switched circuit. Magnetic contactors consist of a coil which produces magnetic field. Circuit Diagram - A Circuit Diagram Maker Circuit Diagram is a free application for making electronic circuit diagrams and exporting them as images. Design circuits online in your browser or using the desktop application. Relay Latching Circuit using Push Button - Instrumentation Design a Relay Latching Circuit using Push Button, Relay Circuit for Hooter with Reset Button, Here PLC command is shown as NO push button in the above diagram. we can replace NO push button with PLC command. As Normally Open contact changed to Normally closed > The First NO contact will be used for Relay Holding / Latching Purpose.