IEEE / ANSI · TS SELF

ANSI/IEEE Self-operating thermal switch form

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.

Identify the device and formRead the connections and stateCheck 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.

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.

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.

Read the source: Autodesk IEEE Symbol Preview — Pressure and Temperature Switches

IEEE / ANSI · 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.

Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.

Schematic · TS SELFANSI/IEEE Self-operating thermal switch form: original educational illustration
Original educational illustrationNot to scale · See source and graphic notes

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

A distinction that matters

A self-operating thermal switch is not the same as a powered temperature monitoring relay.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

Autodesk IEEE Symbol Preview — Pressure and Temperature Switches

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.

Autodesk · Public reference checked 14 October 2026 · Link only

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.

Entry JSON · Entry Markdown · Last editorial update: 28 October 2026

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