{"schemaVersion":1,"slug":"ansi-self-operating-thermal-switch","name":"ANSI/IEEE Self-operating thermal switch form","kind":"symbol","abbreviation":"TS SELF","aliases":["HTS12S59C","VTS12S59C","IEEE Thermal Switch Normally Closed, Self-operating","ANSI Self-operating thermal switch"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of self-operating thermal switch: a self-operating thermal switch responds directly to its thermal condition rather than through a separate powered relay input.","description":["This reference locates self-operating thermal switch in Autodesk's IEEE-oriented pressure and temperature switches family. A self-operating thermal switch responds directly to its thermal condition rather than through a separate powered relay input. Its contact and reset behaviour are device-specific. The public library uses HTS12S59C 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.","Trace the thermal device separately from any PLC or auxiliary supply. A self-operating thermal switch is not the same as a powered temperature monitoring relay. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Trace the thermal device separately from any PLC or auxiliary supply.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State thermal threshold","Identify reset characteristic","Reference mounted location"],"distinction":"A self-operating thermal switch is not the same as a powered temperature monitoring relay.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Pressure and Temperature Switches; published form: Thermal Switch Normally Closed, Self-operating."},{"label":"Public vendor block","value":"HTS12S59C. Vendor library token, not an IEEE symbol number."},{"label":"Drawing role","value":"Actuated indication"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-fb8b55db-cba8-4a86-b8d1-aa59012f1a8e","relevance":"Public IEEE-oriented Pressure and Temperature Switches table explicitly lists HTS12S59C as Thermal Switch Normally Closed, Self-operating. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["self-operating-thermal-switch","plc-io","normally-open-contact"],"artwork":"s28-ansi-self-operating-thermal-switch","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Thermal Switch Normally Closed, Self-operating","reference":"Autodesk IEEE Symbol Preview: Pressure and Temperature Switches, block HTS12S59C. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"self-operating-thermal-switch"},"plainEnglish":{"title":"What does ANSI/IEEE Self-operating thermal switch form mean?","introduction":"This reference locates self-operating thermal switch in Autodesk's IEEE-oriented pressure and temperature switches family. A self-operating thermal switch responds directly to its thermal condition rather than through a separate powered relay input. Its contact and reset behaviour are device-specific. The public library uses HTS12S59C 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":"Trace the thermal device separately from any PLC or auxiliary supply. A self-operating thermal switch is not the same as a powered temperature monitoring relay. 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":"Coil","meaning":"A wound conductor that can produce a magnetic field when energised."},{"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":"Autodesk IEEE Symbol Preview — Pressure and Temperature Switches","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-FB8B55DB-CBA8-4A86-B8D1-AA59012F1A8E.htm"}],"detail":"IEEE-library form of self-operating thermal switch: a self-operating thermal switch responds directly to its thermal condition rather than through a separate powered relay input. A self-operating thermal switch is not the same as a powered temperature monitoring relay.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-self-operating-thermal-switch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-self-operating-thermal-switch.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-fb8b55db-cba8-4a86-b8d1-aa59012f1a8e","title":"Autodesk IEEE Symbol Preview — Pressure and Temperature Switches","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-FB8B55DB-CBA8-4A86-B8D1-AA59012F1A8E.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Pressure and Temperature Switches table explicitly lists HTS12S59C as Thermal Switch Normally Closed, Self-operating. This supports the vendor convention context, not reproduction of the publisher graphic."}]}