Understand the difference.

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

VDR

IEEE / ANSI

ANSI/IEEE varistor symbol

The varistor form adds a voltage-dependent characteristic to a resistive component. The connection point and selected voltage and surge data establish the protective use; its drawing modifier does not replace the equipment rating.

Drawing use

SLD / Schematic

Application

Electronic components

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Resistive Components functional form. Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

A nonlinear varistor and a fixed current-limiting resistor do not provide the same response.

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VDR

Symbols

Varistor

A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting. Its rating and protected connection are needed beyond the generic outline.

Drawing use

SLD / Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

A varistor is nonlinear; a fixed resistor does not provide the same voltage-dependent function.

Full referenceAdd to legend

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