FAIRFIELD, Conn. (AP) – General Electric Co. and its two largest labor unions reached tentative agreements Sunday on contracts affecting more than 20,000 employees nationwide, company and union leaders said.

The new four-year agreements replace contracts that were set to expire at midnight Sunday.

If ratified by union members on June 28, terms of the new contracts with the two unions also would be extended to nine other unions that have local contracts with GE.

Negotiations between GE and its unions have been viewed as a possible bellwether for manufacturers nationwide, which are watching how the conglomerate handles perennial issues such as pensions and rising health care costs.

“We have achieved our goal of producing balanced contracts that benefit both employees and GE,” said Bill Conaty, the company’s senior vice president, in a statement issued jointly with union leaders Sunday.

“These agreements provide employees with good wages and excellent benefits while allowing GE businesses to continue competing in tough global markets,” he said.

Specifics were not given Sunday about wage increases, pension plan changes, benefit plan updates or other details in the proposed agreements that affects workers in Massachusetts and elsewhere.