{"schemaVersion":1,"slug":"ansi-mechanical-stop-latch-in-neutral-state","name":"ANSI/IEEE Mechanical stop latch in neutral state form","kind":"symbol","abbreviation":"Q021209","aliases":["Q021209","IEEE Stop Latch in Neutral Position","ANSI Mechanical stop latch in neutral state"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of mechanical stop latch in neutral state: this form identifies the neutral state of the represented stop-latch mechanism.","description":["This reference locates mechanical stop latch in neutral state in Autodesk's IEEE-oriented mechanical controls family. This form identifies the neutral state of the represented stop-latch mechanism. Neutral describes the represented retaining mechanism, not every electrical contact belonging to the assembly. A state table provides the relationship between latch condition and contact states. The public library uses Q021209 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","Identify the associated mechanism and define the neutral condition in its operating sequence. Use separate contact and position references when those interfaces appear elsewhere in the schematic. Keep neutral and engaged states explicit in state or sequence documentation. Neutral is a mechanism state, not an assertion that every contact is open. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Keep neutral and engaged states explicit in state or sequence documentation.","Neutral is a mechanism state, not an assertion that every contact is open."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Keep neutral and engaged states explicit in state or sequence documentation.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"Neutral is a mechanism state, not an assertion that every contact is open.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Mechanical Controls; published form: Stop Latch in Neutral Position."},{"label":"Public vendor block","value":"Q021209. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Keep neutral and engaged states explicit in state or sequence documentation."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"s28-ieee-mechanical-controls","relevance":"Public IEEE-oriented Mechanical Controls table explicitly lists Q021209 as Stop Latch in Neutral Position. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-mechanical-stop-latch-in-neutral-state","relay-coil","normally-open-contact"],"artwork":"s28-ansi-mechanical-stop-latch-in-neutral-state","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Stop Latch in Neutral Position","reference":"Autodesk IEEE Symbol Preview: Mechanical Controls, block Q021209. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-mechanical-stop-latch-in-neutral-state"},"plainEnglish":{"title":"What does ANSI/IEEE Mechanical stop latch in neutral state form mean?","introduction":"This reference locates mechanical stop latch in neutral state in Autodesk's IEEE-oriented mechanical controls family. This form identifies the neutral state of the represented stop-latch mechanism. Neutral describes the represented retaining mechanism, not every electrical contact belonging to the assembly. A state table provides the relationship between latch condition and contact states. The public library uses Q021209 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","drawings":"Identify the associated mechanism and define the neutral condition in its operating sequence. Use separate contact and position references when those interfaces appear elsewhere in the schematic. Keep neutral and engaged states explicit in state or sequence documentation. Neutral is a mechanism state, not an assertion that every contact is open. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","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":"Autodesk IEEE Symbol Preview: Mechanical Controls","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-450F6FD7-7A10-4F81-92A1-0D9BECFB23FC.htm"}],"detail":"IEEE-library form of mechanical stop latch in neutral state: this form identifies the neutral state of the represented stop-latch mechanism. Neutral is a mechanism state, not an assertion that every contact is open.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-mechanical-stop-latch-in-neutral-state","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-mechanical-stop-latch-in-neutral-state.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-ieee-mechanical-controls","title":"Autodesk IEEE Symbol Preview: Mechanical Controls","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-450F6FD7-7A10-4F81-92A1-0D9BECFB23FC.htm","type":"cad-reference","scope":"Public mechanical controls family names and vendor block tokens. Horizontal, vertical and rotated placements are not separate engineering functions. Exact standard geometry is not reproduced.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Public IEEE-oriented Mechanical Controls table explicitly lists Q021209 as Stop Latch in Neutral Position. This supports the vendor convention context, not reproduction of the publisher graphic."}]}