Around 35 jobs are to go at the Northern Ireland operation of Caterpillar, the company has said.
Cuts are expected to affect staff and agency positions by the end of this month.
The US engineering firm employs about 2,000 across plants in Larne, Belfast and Monkstown.
A company statement said: "Caterpillar has notified its employees that its electric power division will take measures to better align its organisational structure, resulting in a more efficient and competitive business model to better serve our customers.
"Resources will be provided to assist impacted individuals during this transition. We know this is difficult for our employees and their families, but we must take steps to position the company for long-term success."
Davy Thompson for the union Unite said: "It's a blow to manufacturing. The losses will be concentrated on the engineering and staff levels."