Contacts are engaged initially and never broken unless the connectors fail.
----- Original Message -----
From: Blair K. Hogg<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Friday, February 11, 2005 9:05 AM
Subject: Re: [TN] Calculate current capacity for electrical contacts
Are the contacts switched (made or broken) dry (no current flowing)? That may have some effect.
Blair
>>> [log in to unmask]<mailto:[log in to unmask]> 02/11/05 06:25AM >>>
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]<mailto:[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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