N.J. Stat. § 19:6-5
Any member of a district board in an election district may be summarily removed from office, with or without cause, and vacancies filled, at any time by the members of the county board of the county in which such election district is located in the manner hereinafter provided. In the case of a member of the district board who was appointed as a member of a political party, removal shall be made by the members of the county board of that political party, and in the case of a member of the district board unaffiliated with a political party at the time of appointment, removal shall be made by the county board. Upon a removal the members of the county board so acting shall make a certificate of removal and file same with the county board.
The members of the county board removing such election officer shall forthwith proceed to fill the vacancy caused by the removal, and shall issue to the person selected to fill the vacancy a certificate which shall entitle that person to perform all the duties of a member of the district board for such election district.
N.J.S. § 19:6-5