A circuit breaker includes a line terminal, a load terminal, separable contacts electrically connected in series between the terminals, a neutral conductor, and an operating mechanism structured to open and close the contacts and trip open the contacts in response to a trip signal. In particular embodiments, cells of the cellular slime mold Dictyostelium discoideum are contacted with candidate agents and the expression of genes in the Nucleotide Excision Repair and Base Excision Repair pathways are examined. Each switch node, in its basic form, includes a first relay, a second relay, and a third relay. According to a disclosed embodiment, the time for a next scheduled COMM1 wakeup process to be performed by a COMM1 module is established.