Ken: Very short large current pulse handling in resistors.


> This is one of the places where you will need to
> carefully read the datasheets and look for peak current ratings.

Philps of yore used to produce reports and even data sheets on such things.
Much such may be on web.

For newer stuff a web search should help

Riedon want to be your friend (but want you to use wire wounds)
The paper is worth reading as they discuss why the various ratings
exist and provide graphs.
Common sense MAY almost allow extension to other technologies with due care=
..
(Caveat Incinerator)

     http://www.riedon.com/us/technical-information/application-notes/pulse=
-rating.html

As do TT

      http://www.welwyn-tt.co.uk/pdf/application_notes/Pulse-Overload_AN.pd=
f

Vitrohm have some interesting comments
Including

The current limit is defined by the current density,
and 100 A per mm2
are considered absolute
maximum in power electronics. With a 0,8 mm
diameter copper wire, the current limit is 50 A.
With respect to reliability, the welding junction
between copper and resistive alloy should not carry
more than 20 A continuously.
The 50 A limit may not be exceeded even under
pulse condition

And

This limits also the pulse handling capacity.
50A can be carried by the internal contacts, but energy
must not exceed 625 mWs

            http://www.vitrohm.com/files_stat/design_notes.pdf
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