US 12,170,181 B2
Pyrotechnic circuit breaker
Francois Gaudinat, Amblainville (FR); Gildas Clech, Plougastel-Daoulas (FR); Jean Champendal, Quimper (FR); Isaure Masquelier, Paris (FR); and Ludovic Lageat, Plougastel-Daoulas (FR)
Assigned to Autoliv Development AB, Vargarda (SE)
Appl. No. 18/003,636
Filed by AUTOLIV DEVELOPMENT AB, Vargarda (SE)
PCT Filed Jul. 1, 2021, PCT No. PCT/EP2021/068114
§ 371(c)(1), (2) Date Dec. 28, 2022,
PCT Pub. No. WO2022/003080, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2007024 (FR), filed on Jul. 2, 2020.
Prior Publication US 2023/0260726 A1, Aug. 17, 2023
Int. Cl. H01H 39/00 (2006.01)
CPC H01H 39/006 (2013.01) 17 Claims
OG exemplary drawing
 
1. A pyrotechnic circuit breaker comprising:
a casing;
at least two connection terminals;
an inner electrical circuit connecting the two connection terminals and formed, for example, by an electrical conductor;
an opening member, movable and arranged to open a part to be opened of the inner electrical circuit during a movement between an initial position and a final position, so as to form at least two discrete portions of the electrical conductor after opening;
a pyrotechnic actuator arranged to move the opening member from the initial position to the final position;
an inner chamber defined by an inner wall formed in the housing, and receiving the part to be opened; and
an insulating grease arranged in the inner chamber,
wherein the insulating grease is arranged on or covers at least two predetermined parts of the inner wall and is spaced from the electrical conductor before firing of the pyrotechnic circuit breaker such that the electrical conductor is free of insulating grease, and
where the insulating grease functions to increase an insulative resistance of the pyrotechnic circuit breaker after firing.