{"schemaVersion":1,"slug":"iec-inductive-proximity-sensor-normally-closed-3-wire","name":"IEC inductive proximity sensor: normally closed 3 wire","kind":"symbol","abbreviation":"IND","aliases":["HPX12IN3","VPX12IN3","inductive proximity sensor Normally Closed 3 Wire"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"Inductive proximity sensor form: Normally Closed 3 Wire.","description":["An inductive proximity sensor detects a metallic target through the effect it has on an electromagnetic sensing field. This entry identifies the normally closed 3 wire form in the publisher's IEC-context family.","A metal flag on a carriage can produce a controller input without touching a mechanical switch. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input.","Target material, sensing distance and output circuit are product properties; an inductive mark does not identify PNP, NPN or a universal terminal assignment."],"readingNotes":["The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.","The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input.","Target material, sensing distance and output circuit are product properties; an inductive mark does not identify PNP, NPN or a universal terminal assignment."],"drawingChecklist":["Identify the target, sensing mode and expected normal condition.","Label supply, output and connector pins from the actual device diagram.","Reference output circuit type, operating range and controller input."],"distinction":"This entry adds the normally closed 3 wire detail to the broader inductive proximity sensor family. Target material, sensing distance and output circuit are product properties; an inductive mark does not identify PNP, NPN or a universal terminal assignment.","facts":[{"label":"Drawing form","value":"Normally Closed 3 Wire"},{"label":"Public vendor block names","value":"HPX12IN3 / VPX12IN3. Autodesk identifiers, not standards database IDs."},{"label":"Drawing purpose","value":"inductive proximity sensor"},{"label":"Graphic scope","value":"Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint."}],"references":[{"sourceId":"pub-symbol-inductive-sensors","relevance":"Public Inductive Switches table explicitly lists HPX12IN3 / VPX12IN3 with this operating or connection form. Vendor graphics are linked, not copied."}],"related":["inductive-proximity-switch","plc-digital-input","terminal"],"artwork":"s28-iec-inductive-proximity-sensor-normally-closed-3-wire","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Normally Closed 3 Wire","reference":"Autodesk IEC-60617 Symbol Preview: Inductive Switches, HPX12IN3 / VPX12IN3. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted."},"plainEnglish":{"title":"What does IEC inductive proximity sensor: normally closed 3 wire mean?","introduction":"An inductive proximity sensor detects a metallic target through the effect it has on an electromagnetic sensing field. This entry identifies the normally closed 3 wire form in the publisher's IEC-context family.","example":"A metal flag on a carriage can produce a controller input without touching a mechanical switch. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The three-wire form distinguishes supply, return and switching output. Confirm sourcing or sinking operation from the actual sensor circuit before connecting it to an input.","drawings":"Target material, sensing distance and output circuit are product properties; an inductive mark does not identify PNP, NPN or a universal terminal assignment.","terms":[{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"AutoCAD Electrical: Inductive proximity switches","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-596652AB-6555-4F9A-B575-555D40C2ECD4.htm"}],"detail":"Inductive proximity sensor form: Normally Closed 3 Wire. This entry adds the normally closed 3 wire detail to the broader inductive proximity sensor family. Target material, sensing distance and output circuit are product properties; an inductive mark does not identify PNP, NPN or a universal terminal assignment.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-inductive-proximity-sensor-normally-closed-3-wire","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-inductive-proximity-sensor-normally-closed-3-wire.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-inductive-sensors","title":"AutoCAD Electrical: Inductive proximity switches","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-596652AB-6555-4F9A-B575-555D40C2ECD4.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public Inductive Switches table explicitly lists HPX12IN3 / VPX12IN3 with this operating or connection form. Vendor graphics are linked, not copied."}]}