Reversibly blocks voltage-gated potassium channels Kv1.2/KCNA2, Kv1.3/KCNA3 and, weakly, Shaker B. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Contains 4 disulfide bonds. Does not inhibit voltage-gated potassium channels Shab, Kv1.2/KCNA1 and Kv1.4/KCNA4. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 24 subfamily.