Understand the difference.

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

TOFF NC

IEEE / ANSI

ANSI/IEEE off-delay normally-closed contact symbol

The off-delay NC contact form identifies instant opening on operation and a delayed return to the documented closed state. The circuit remains interrupted during the specified release interval, with supply-loss handling defined by the timer product.

Drawing use

Schematic

Application

Control circuits

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Time Delay Relays 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

Contact polarity and timing direction are independent aspects of the output definition.

Full referenceAdd to legend

TOFF NC

Symbols

Off-delay normally-closed contact

An off-delay NC contact returns to its documented normally-closed state after the delay following removal of the timing trigger. Its role is read from the complete timer and contact circuit.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

Contact polarity and timing direction are separate pieces of information.

Full referenceAdd to legend

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