The working principle of the electrical contacts

Električni kontakti are difficult for a single pure metal to meet all the requirements of the contact. With the development of vacuum switchgear to large capacity, contact materials have experienced the development process from single metal to binary and then to multicomponent composites. In different application occasions, the requirements for contact materials also have different degrees of emphasis. There are many contradictions between the physical properties of contact materials;

1.(električni kontakti)Nizka mejna vrednost zahteva, da ima material nizko prevodnost, toplotno prevodnost in nizko tališče. Visoka prekinitvena zmogljivost, odpornost na talilno varjenje in odpornost proti električni obrabi zahtevajo nasprotne lastnosti. To je tudi ena največjih težav pri razvoju kontaktnih materialov.

2.(električni kontakti)Materials with fusion welding resistance are generally brittle and have poor strength, which is in contradiction with the requirements for higher mechanical strength, deformation resistance and electrical wear resistance of the contact. In order to solve or reduce the above contradiction, most material workers believe that alloying is the only choice. In the selection of alloy elements, the following trends exist according to different requirements