Sylvania 5SWW W KPM-1A TB1391 Relay

Sylvania W / KPM-1A Relay, MFR 5SWW, is a PMS 5S series relay identified by TB1391 and part of the Sylvania KPM-1A family. This unit carries the factory designation 5SWW and is cataloged as a PMS 5S TB1391 relay, aligning with related KPM-1A control-relay variants. Retail listings identify the model as discontinued, reflecting its status in current inventories while still offering a reference point for maintaining or sourcing legacy equipment. The TB1391 code anchors the relay’s position within Sylvania’s legacy PM relay lineup, with the PMS 5S designation indicating its role in switched-control functions within electrical control panels and automation schemes that historically employed Sylvania relays of this family. Buyers matching this part to existing panels should verify compatibility with the PMS 5S TB1391 specification, particularly where legacy diagrams reference the W/KPM-1A configuration. The PMS5S TB139-1 variant notes in secondary listings further corroborate the same relay family and part lineage, enabling cross-reference across vintage catalogs and secondary marketplaces. Overall, the 5SWW W / KPM-1A relay represents a legacy control-relay solution from Sylvania, primarily encountered in older equipment where the TB1391 code was specified in the schematic documentation.