Blocks human voltage-gated potassium channels Kv1.2/KCNA2 (IC(50)=0.7 nM), Kv1.3/KCNA3 (IC(50)=26.2 nM) and blocks intermediate conductance calcium-activated potassium channel KCa3.1/KCNN4 (IC(50)=56 nM). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Does not block voltage-gated potassium channel Kv1.1/KCNA1 or the Shaker IR (with inactivation domain removed). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 02 subfamily.