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February 2005

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Subject:
Re: Calculate current capacity for electrical contacts
From:
Ofer Cohen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ofer Cohen <[log in to unmask]>
Date:
Fri, 11 Feb 2005 13:25:32 +0200
Content-Type:
text/plain
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text/plain (44 lines) 
Well, it depends: this is a matter of high power circuitry, and the concerns of low signal are less relevant.

Check you loads: capacitive or inductive loads require high stress factor, and may need protection networks. Resistive loads do not need it. Check the count of the make and break cycles, and verify the limits according to the load characteristics. 

Regards
Ofer Cohen
Manager
Quality Assurance, Reliability and Production Technologies
Seabridge Ltd. - A Siemens Company


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of - Bogert
Sent: Friday, February 11, 2005 01:39
To: [log in to unmask]
Subject: [TN] 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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