Inhibits voltage-gated potassium channel rKv1.1/KCNA1 (IC(50)=780-2110 nM), rKv1.2/KCNA2 (IC(50)=0.19 nM), hKv1.3/KCNA3 (IC(50)=67 nM), and rKv1.6/KCNA6 (IC(50)=8.9 uM) (PubMed:25792741, PubMed:30248306). Its activity (tested on Kv1.2) is not voltage-dependent (PubMed:30248306). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Does not inhibit Kv1.4/KCNA4, Kv1.5/KCNA5, Kv2.1/KCNB1, Kv3.1/KCNC1, Kv4.2/KCND2, Kv11.1/KCNH2, Nav1.1/SCN1A, Nav1.2/SCN2A, Nav1.4/SCN4A, Nav1.5/SCN5A, B.germanica Nav1, and Cav3.3/CACNA1I (when 1 uM is tested). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 01 subfamily.