HarborOne Credit Union in Brockton has scheduled a special meeting March 11 for members to vote on its proposed conversion to a mutual cooperative bank charter.

The $1.9 billion credit union announced in March that its board of directors had given the green light to pursue a charter change.

James Rice, HarborOne’s vice president of marketing, confirmed the date of the special meeting, which will be held at 5 p.m. at the Shaw’s Center in Brockton.

HarborOne has about 150,000 members, but only those who were members for three months as of Feb. 15, 2012 will be eligible to vote, Rice said.

The credit union has said it wants to convert to a bank charter so it can have greater flexibility to expand its customer base and access to additional capital.

The proposal has come under fire, however, from credit union industry leaders. Steve Bisker, a former attorney for the National Credit Union Administration – a federal agency that supervises credit unions – told the Credit Union Times, a trade publication, in March that HarborOne was at only 20 percent of its business lending cap.

"The stated ‘consequences of conversion’ are inaccurate or misleading at best," Bisker said.

Rice declined comment, citing "regulatory constraints around the charter change."