Selection of the contact material for low-voltage contactors

Abstract

For low-voltage contactors properties like small voltage drop at nominal current, small chopping current, small contact losses, high switching capacity etc. are demanded. Different contact materials become to order with a four -or more-parameter diagram, which facilitates the suitable contact material. After that special characteristics of the CuFe-material are discussed and compared with the CuCr-material with regard to the application in low-voltage contactors. Experiences of the practical lifetime at application round off the contribution.