Two sources who were familiar with the dealing said Siemens AG had been engaging private equity investor Triton for the sale of its business unit. The sources also said Sun Capital was no longer interested with Siemens' postal automation and baggage-handling division unit.

Triton reportedly also was talking to German state bank KfW to discuss debt guarantees on the machines of Siemens' unit. Reuters said large machinery suppliers usually provide debt guarantees and warrants to cover pre-installation performance and machine operation costs. The sources did not disclose any other financial details about the reported sale.

The German company was reportedly divesting its less profitable divisions. Siemens was said to be selling its water technologies unit and wiring accessories unit.

Siemens refused to comment about the reported sale of its postal automation and baggage-handling division unit, nor provide word about its rumored exits in its other business units.