Siemens HF321N has 1 recorded cross-reference match across 1 manufacturer. Compare the listed alternatives and check their source notes before selecting a replacement.
PDF page 2, row 1.25. Printed section: Fusible, Three-Pole, Four-Wire, 240 Vac, NEMA 1; 30 A. Always verify poles and wires: catalog codes can occur in multiple tables. Original printed codes retained; source is an Eaton publication hosted by PG&E. Historical manufacturer-listed selection candidate, not a drop-in guarantee. Verify current ordering codes, ratings, circuit function, poles/wires, enclosure, mounting, approvals and application suitability. Bidirectional discovery does not imply symmetric technical interchangeability. No transitive cross is inferred.
Counts describe recorded relationships, not stock, sales, testing or independent qualification. Manufacturer-and-part identities remain separate. Indexing dates do not establish current specifications or availability.
Check current manufacturer documents and electrical, mechanical, environmental and application requirements before selecting a replacement.