Half Mag / Half Zine

ABB Ltd. is preparing to kick off a fresh attempt to sell its power-conversion unit as Chief Executive Officer Bjoern Rosengren continues to offload peripheral businesses, according to people familiar with the matter.

The Swiss engineering company plans to start soliciting interest in the business in September, the people said, asking not to be identified because the information is private. ABB is working with Citigroup Inc. on the proposed divestment, according to the people.