A couple of notes… The concept of automatic reclosing applies only to overhead distribution and transmission lines, with mostly short-lived faults from lightning and tree-branch exposure. Temporary faults are just about unheard of in underground systems, as is obviously the case for premises {inside} wiring.
Depending on age, sectionalizers may use mineral oil, sulfur hexafluoride gas or vacuum for insulation around the 11kV contacts.
