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February 2005

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Subject:
From:
Thomas Beneken <[log in to unmask]>
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Date:
Fri, 11 Feb 2005 09:01:42 +0100
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The issue is delicate - much more things to consider.

The ultimate source on contact physics is
Holm, R.: Electric Contacts - Theory and Application, 1967

an alternative (and easier available) is
Slade, P.: Electrical Contacts -Principles and Applications, Decker Inc.,
1999

Thomas

> -----Original Message-----
> From: - Bogert [mailto:[log in to unmask]]
> Sent: Friday, February 11, 2005 12:39 AM
> Subject: Calculate current capacity for electrical contacts
>
>
> February 10, 2005
>
> How does one determine what current can be carried by
> electrical connector contacts to determine capability to
> carry about 80 AMPs (RMS), low freq AC, or DC.
>
> We have an application that uses a carbon steel base metal
> pin contact.  The contact is given a nickel flash, followed
> by a copper plating (to fill in small voids), followed by
> another nickel flash, followed by silver plating.  Does one
> calculate current capacity from just the carbon steel base
> metal, or does one need to take the plating into account?
> What formula or chart is used to support the calculation?  If
> the nickel flash thickness is increased, will it impact
> current capacity?  If plating is changed to gold, does that
> impact current
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> -----------------------------------------------------
> capacity?
>

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