US 12,068,118 B2
Vacuum circuit breaker with weldable copper switch contacts
Thomas Chyla, Berlin (DE)
Assigned to Siemens Energy Global GmbH & Co. KG, Munich (DE)
Appl. No. 17/786,696
Filed by Siemens Energy Global GmbH & Co. KG, Munich (DE)
PCT Filed Nov. 17, 2020, PCT No. PCT/EP2020/082400
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/121832, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10 2019 219 879.1 (DE), filed on Dec. 17, 2019.
Prior Publication US 2023/0017027 A1, Jan. 19, 2023
Int. Cl. H01H 1/02 (2006.01); H01H 11/04 (2006.01); H01H 33/664 (2006.01)
CPC H01H 11/04 (2013.01) [H01H 1/02 (2013.01); H01H 33/664 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of producing an electrical switching contact arrangement for a vacuum circuit breaker having two electrical contact pieces, the method which comprises the following steps:
a) providing two electrical contact pieces made of copper or a copper alloy, each of the contact pieces having a contact side;
b) coating, by way of a cold gas spraying process, at least one side of each of the electrical contact pieces with aluminum or an aluminum alloy, and thereby coating at least a side of each of the contact pieces located opposite the contact side of a respective contact piece;
c) welding sides of the contact pieces that are coated with aluminum or aluminum alloy in method step b) to a current transfer contact to form units each consisting of the contact piece and the current transfer contact; and
d) arranging the units consisting of the contact piece and the current transfer contact inside the vacuum circuit breaker.