{"schemaVersion":1,"slug":"iec-selector-switch-contact-3-position-normally-closed-neutral-2","name":"IEC selector-switch contact: 3 position normally closed neutral 2","kind":"symbol","abbreviation":"SS","aliases":["HSS12S33","VSS12S33","selector-switch contact 3 Position Normally Closed Neutral 2"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"Selector-switch contact form: 3 Position Normally Closed Neutral 2.","description":["A rotary selector has discrete handle positions and one or more contact blocks driven by its mechanism. A contact shown as normally open or normally closed describes the stated reference position; it does not give the whole switching table across the remaining positions. This entry identifies the 3 position normally closed neutral 2 form in the publisher's IEC-context family.","For a local/off/remote selector, prepare a contact-versus-position chart alongside the schematic. The chart tells the installer which input is active at each handle setting, while spring-return, maintained and key-operated marks explain how the operator reaches or leaves that setting. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. Keep the publisher's neutral 2 designation beside its contact table; do not infer the complete position sequence from that number.","A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference."],"readingNotes":["The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.","Keep the publisher's neutral 2 designation beside its contact table; do not infer the complete position sequence from that number.","A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference."],"drawingChecklist":["Label every handle position and preserve its reference orientation.","Cross-reference a contact-versus-position chart.","State maintained positions, return directions and any key-removal conditions."],"distinction":"This entry adds the 3 position normally closed neutral 2 detail to the broader selector-switch contact family. A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference.","facts":[{"label":"Drawing form","value":"3 Position Normally Closed Neutral 2"},{"label":"Public vendor block names","value":"HSS12S33 / VSS12S33. Autodesk identifiers, not standards database IDs."},{"label":"Drawing purpose","value":"selector-switch contact"},{"label":"Graphic scope","value":"Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint."}],"references":[{"sourceId":"pub-symbol-selector-three","relevance":"Public 3 Position Selector Switches table explicitly lists HSS12S33 / VSS12S33 with this operating or connection form. Vendor graphics are linked, not copied."}],"related":["selector-switch","three-position-maintained-selector","three-position-centre-return-selector"],"artwork":"s28-iec-selector-switch-contact-3-position-normally-closed-neutral-2","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"3 Position Normally Closed Neutral 2","reference":"Autodesk IEC-60617 Symbol Preview: 3 Position Selector Switches, HSS12S33 / VSS12S33. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted."},"plainEnglish":{"title":"What does IEC selector-switch contact: 3 position normally closed neutral 2 mean?","introduction":"A rotary selector has discrete handle positions and one or more contact blocks driven by its mechanism. A contact shown as normally open or normally closed describes the stated reference position; it does not give the whole switching table across the remaining positions. This entry identifies the 3 position normally closed neutral 2 form in the publisher's IEC-context family.","example":"For a local/off/remote selector, prepare a contact-versus-position chart alongside the schematic. The chart tells the installer which input is active at each handle setting, while spring-return, maintained and key-operated marks explain how the operator reaches or leaves that setting. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. Keep the publisher's neutral 2 designation beside its contact table; do not infer the complete position sequence from that number.","drawings":"A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference.","terms":[{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"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: Three-position selectors","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-D8675B9D-9CBF-4B7F-8F09-2444779614D0.htm"}],"detail":"Selector-switch contact form: 3 Position Normally Closed Neutral 2. This entry adds the 3 position normally closed neutral 2 detail to the broader selector-switch contact family. A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-selector-switch-contact-3-position-normally-closed-neutral-2","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-selector-switch-contact-3-position-normally-closed-neutral-2.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-selector-three","title":"AutoCAD Electrical: Three-position selectors","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-D8675B9D-9CBF-4B7F-8F09-2444779614D0.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 3 Position Selector Switches table explicitly lists HSS12S33 / VSS12S33 with this operating or connection form. Vendor graphics are linked, not copied."}]}