Patent ID: 7466528

Claim:
A protection device for protecting an electrical installation against overvoltages, overloads or short-circuits, comprising: at least two main electrodes between which an electric arc is able to form, and an electric arc breaker device extending, considering the direction of propagation of the electric arc, between an upstream end and a downstream end and having, at the upstream end an entry area for the arc, at which the electric arc penetrates inside the breaker device, wherein the breaker device including, positioned at the upstream end, insulating means against the return of the electric arc, structurally designed and laid out to allow the electric arc to enter the breaker device while forming an obstacle against the exiting of the electric arc, to prevent the electric arc, once located inside the breaker device from escaping from the breaker device, the insulating means are formed by several flexible strips in an insulating material, laid out in order to form a partial insulating barrier between the electrodes and the upstream end, wherein the strips are laid out to cover in totality the upstream end of the breaker device located around the entry area for the arc.