Understand the difference.

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

NO UNLATCH

IEEE / ANSI

ANSI/IEEE Manually unlatched NO contact form

This reference locates manually unlatched no contact in Autodesk's IEEE-oriented relays and contacts family. A manually unlatched NO contact includes a mechanical retaining action released by a documented manual operation. Its schematic modifier explains why removal of an initiating signal may not restore the initial state. The public library uses HCR2121F for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.

Drawing use

Schematic

Application

Control circuits

Reference family

IEEE / ANSI / Manufacturer

Form evidence

With Mechanical Block and Manual Unlatching. Autodesk IEEE Symbol Preview: Relays and Contacts, block HCR2121F. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.

A distinction that matters

Manual unlatching concerns the mechanism, not the contact's load interrupting rating.

Full referenceAdd to legend

NO UNLATCH

Symbols

Manually unlatched NO contact

A manually unlatched NO contact includes a mechanical retaining action released by a documented manual operation. Its schematic modifier explains why removal of an initiating signal may not restore the initial state.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

Manual unlatching concerns the mechanism, not the contact's load interrupting rating.

Full referenceAdd to legend

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