Enables voltage-gated monoatomic ion channel activity. Involved in monoatomic ion transmembrane transport. Predicted to be located in somatodendritic compartment and synapse. Predicted to be part of voltage-gated potassium channel complex. Expressed in head muscle; hermaphrodite distal tip cell; neurons; non-striated muscle; and spermatheca. Human ortholog(s) of this gene implicated in Alzheimer's disease; electroclinical syndrome (multiple); and glioblastoma. Is an ortholog of human KCNC1 (potassium voltage-gated channel subfamily C member 1); KCNC2 (potassium voltage-gated channel subfamily C member 2); and KCNC4 (potassium voltage-gated channel subfamily C member 4).