The PA State Constitution, Article 7, § 11
Election Officers
District election boards shall consist of a judge and two inspectors, who shall be chosen at municipal elections for such terms as may be provided by law. Each elector shall have the right to vote for the judge and one inspector, and each inspector shall appoint one clerk. The first election board for any new district shall be selected, and vacancies in election boards filled, as shall be provided by law. Election officers shall be privileged from arrest upon days of election, and while engaged in making up and transmitting returns, except upon warrant of a court of record or judge thereof, for an election fraud, for felony, or for wanton breach of the peace. In cities they may claim exemption from jury duty during their terms of service.