Continuing the investigation of the post-arc k.a) current within low voltage sttliiching process in vacuum, the high tiiodiilation frequency of h e p a . current was ako takcn into account The conslants $ned jbr the adopted mathematicut sinipl$ed p.a. model were deduced .from the experimental dam, considering an equivalent scheme of-the quenching chamber in vacuum forniedfrom a cipciionco ~n d the electric discharge in U non-linem emironmetit.