Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEEE / ANSI

ANSI/IEEE Symmetric gas discharge tube form

This reference locates symmetric gas discharge tube in Autodesk's IEEE-oriented miscellaneous family. The publisher's IEC-oriented library lists a symmetric protective gas discharge tube separately from the standard form. The symmetric drawing presents both electrodes identically, emphasising that the device behaves the same for either polarity of surge, as is typical for AC and signal line protection. The public library uses HFU1_S00375 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.

Drawing use: Schematic
Application: Connections & wiring
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Protective Gas Discharge Tube, Symmetric. Autodesk IEEE Symbol Preview: Miscellaneous, block HFU1_S00375. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.

A distinction that matters

The symmetric form draws identical electrodes; the standard gas discharge tube form may show the electrodes differently.

Full reference

IEC

Symmetric gas discharge tube

The publisher's IEC-oriented library lists a symmetric protective gas discharge tube separately from the standard form. The symmetric drawing presents both electrodes identically, emphasising that the device behaves the same for either polarity of surge, as is typical for AC and signal line protection.

Drawing use: Schematic
Application: Connections & wiring
Reference family: IEC / Manufacturer
Form evidence: Protective Gas Discharge Tube, Symmetric. Autodesk IEC-60617 Symbol Preview: Miscellaneous; vendor family reference, not certified IEC geometry.

A distinction that matters

The symmetric form draws identical electrodes; the standard gas discharge tube form may show the electrodes differently.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.