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===<!--6.4.2 -->Contact Physics – Formulas===
*'''Constriction resistance'''
{| class="twocolortablescalable" style="text-align: left; font-size: 12px; width:45%;"
|-
!Material combination
|-
|Brass - Brass
|0,.67 x 10<sup>-3</sup>
|-
|Steel – Silver
|0.06 x 10<sup>-3</sup>
|-
|ASTM B 36/B36M-95 Steel – Copper|| Spec3. for Brass Plate, Sheet, Strip, and Rolled Bar1 x 10<sup>-3</sup>
|-
|ASTM B 122Steel – Brass|3.0 x 10<sup>-3</B122M-08 sup>|} {| Spec. for CuNiSnclass="twocolortable scalable" style="text-align: left; font-, CuNiZnsize: 12px; width:45%; "|-, and CuNi!Contact shapes !m|-Alloy|Flat – Flat |1
|-
|ASTM B 465-09 Pyramid – Flat|| Spec0. for Copper-Iron-Alloy Plate, Sheet, and Strip5
|-
|ASTM B 194-08 Sphere – Flat || Standard Spec0. for CuBe-Alloy Plate, Sheet, Strip and Rolled Bar6
|-
|ASTM B 534-07 Sphere – Sphere|| Sec0. for CuCoBe-Alloy and CuNiBe-Alloy Plate, Sheet, Strip, and Rolled Bar5
|-
|Multi-strand brush - Flat
|1
|-
|Current bar (Busbar) contact
|0.5 - 0.7
|}
<div class="clear"></div>
==References==
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
[[de:Formeln_aus_der_Kontaktphysik]]
