US 11,735,377 B2
Protection device for an electrical circuit, electrical circuit equipped with such a device and method for protecting such an electrical circuit
Patrice Fleureau, Le Taillan Medoc (FR); Pierric Gueguen, Lyons (FR); and Jean-François Oeuvrard, Lyons (FR)
Assigned to MERSEN FRANCE SB SAS, Saint-Bonnet-de-Mure (FR)
Appl. No. 17/297,820
Filed by MERSEN France SB SAS, Saint-Bonnet-de-Mure (FR)
PCT Filed Nov. 27, 2019, PCT No. PCT/EP2019/082686
§ 371(c)(1), (2) Date May 27, 2021,
PCT Pub. No. WO2020/109364, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 1872011 (FR), filed on Nov. 28, 2018.
Prior Publication US 2022/0013308 A1, Jan. 13, 2022
Int. Cl. H01H 85/02 (2006.01); H01H 9/10 (2006.01); H01H 85/143 (2006.01)
CPC H01H 9/106 (2013.01) [H01H 85/0241 (2013.01); H01H 85/143 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A protection device for an electrical circuit configured to transmit an electric current, the protection device comprising:
a first conductor,
a second conductor,
at least one circuit breaker for interrupting an electric current, the circuit breaker comprising a control zone, capable of receiving a tripping signal, and a power zone for passing the electric current,
a control circuit configured to produce and transmit the tripping signal (S) to the control area of the circuit breaker, and
a diagnostic system comprising:
a first sensor for measuring a current flowing in the control zone,
a second sensor for measuring a current flowing in the power zone; and
an electronic processing unit programmed to compare the current values measured by the first sensor and the second sensor and to detect a failure of the protection device according to the measured current values,
wherein the device further comprises a fuse connected in series between the first conductor and the circuit breaker in such a way that a current flowing through the fuse passes entirely through the power zone of the circuit breaker when the power zone is in a state allowing the passage of the current, the fuse being capable of supplying a supply voltage to the control circuit,
and wherein the control circuit is connected between the fuse and the control zone of the circuit breaker.