Vacuum circuit breaker with weldable copper switch contacts

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 the respective contact piece;
• c) welding the 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 a contact piece and a current transfer contact;
• and
• d) arranging the units consisting of the contact piece and the current transfer contact inside the vacuum circuit breaker.