AUGUSTA — Jacob A. McInnis went on trial today in Kennebec County Superior Court on charges of robbery, conspiracy to commit robbery, kidnapping, burglary and theft in connection with a home invasion last year in Windsor.

Two of McInnis’s brothers and a third man pleaded guilty to identical charges and are now imprisoned.

Jacob McInnis, 23, maintained his innocence, and his attorney, Robert Andrews, told jurors that only three men committed the crimes July 8, 2007, when the home of a mother and son, Shirley and Eugene Varney, was entered and ransacked.

The kidnapping involved the restraining of Eugene Varney, 64. Varney, who is mentally impaired and uses a wheelchair, had his hands tied and was bound to a refrigerator during the two-hour search for money and other valuables, said the prosecutor, Deputy District Attorney Alan Kelley.

Andrews said witnesses misidentified Jacob McInnis as a culprit.

Two of the perpetrators are expected to testify against Jacob McInnis.