Enables calmodulin binding activity; sodium ion binding activity; and voltage-gated sodium channel activity. Involved in several processes, including cellular response to antibiotic; neuronal action potential; and response to pyrethroid. Located in axon and neuronal cell body. Part of voltage-gated sodium channel complex. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy 62 and focal epilepsy. Orthologous to human SCN3A (sodium voltage-gated channel alpha subunit 3). [provided by Alliance of Genome Resources, Apr 2022]