Potent inhibitor of voltage-gated potassium channels such as Kv1.1/KCNA1 (IC(50)=0.144 nM), Kv1.2/KCNA2 (IC(50)=0.675 nM), Kv1.3/KCNA3 (IC(50)=0.23 nM) and Shaker (Kd=160 nM). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 02 subfamily.