# ANSI/IEEE Self-operating thermal switch form Canonical URL: https://eloragrid.ai/symbols/ansi-self-operating-thermal-switch Publisher: Elora Grid Updated: 2026-10-28 Lookup label: TS SELF Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Thermal Switch Normally Closed, Self-operating 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. Related representation: [Self-operating thermal switch](https://eloragrid.ai/symbols/self-operating-thermal-switch) 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. ## In plain English ### What does ANSI/IEEE Self-operating thermal switch form mean? 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. ### A simple 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. ### What the drawings help you do 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. ### This particular reference 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. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Coil: A wound conductor that can produce a magnetic field when energised. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview — Pressure and Temperature Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-FB8B55DB-CBA8-4A86-B8D1-AA59012F1A8E.htm) ## What it represents 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. ## How to read it - 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. ## Information to show or reference - State thermal threshold - Identify reset characteristic - Reference mounted location ## Important distinction A self-operating thermal switch is not the same as a powered temperature monitoring relay. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Pressure and Temperature Switches; published form: Thermal Switch Normally Closed, Self-operating. - Public vendor block: HTS12S59C. Vendor library token, not an IEEE symbol number. - Drawing role: Actuated indication - Identifier status: 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. - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview — Pressure and Temperature Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-FB8B55DB-CBA8-4A86-B8D1-AA59012F1A8E.htm) — Autodesk. 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. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.