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Welcome to our Wiki of electrical contacts

The basis of this Wiki is the 2012 issue of the "DODUCO Data Book of Electrical Contacts" which is also available in printed form.
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Featured Article

Contact Physics – Formulas

Contact Physics – Formulas

  • Constriction resistance
R_e = \rho/2a

(Single spot contact according to Holm; circular touching spot between clean

contact surfaces)

R_e = \rho/2Na

(Multi-spot contact according to Holm without influence between the N

individual spots)

R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j

(Multi-spot contact according to Greenwood considering the influence between

the spots)

  • Contact resistanc...

Featured Files

Softening of ARGODUR 27 after annealing.jpg
Softening of ARGODUR 27 after annealing for 1 hr after 80% cold working
Pages: Silver Based Materials,
Werkstoffe auf Silber-Basis

by Doduco Redaktion


One side fixed contact bending spring.jpg
One side fixed contact bending spring
Pages: Berechnung von Kontaktfedern
by Doduco Redaktion


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