Enables voltage-gated potassium channel activity. Involved in potassium ion transport. Located in axolemma; dendrite membrane; and neuronal cell body membrane. Expressed in PLML; PLMR; head neurons; intestine; and tail neurons. 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).