SF6 CIRCUIT-BREAKER INCORPORATING BOTH A VARISTOR AND A CAPACITOR

摘要

A high tension circuit-breaker has an insulating case filled with a dielectric gas such as SF6. A high capacitance capacitor and at least a varistor are electrically interconnected in parallel and are connected to a first terminal. The capacitor and varistor are associated with an insertion mechanism which momentarily inserts the capacitor and varistor in parallel with the arcing contacts during circuit-breaker disengagement or engagement. The insulating case is extended by at least one conductive case housing both the capacitor and at least part of the varistor.