Dual-function toxin that completely inhibits trypsin activity at a molar ratio of 1:1 (dissociation constant of 420 nM) and that inhibits mKv1.3/KCNA3 potassium channel currents with an IC(50) of 371.3 nM. Expressed by the venom gland. Has no effect on chymotrypsin and elastase. Belongs to the venom Kunitz-type family. Scorpion delta-Ktx subfamily. Delta-Ktx 3 sub-subfamily.