snubber caps good for tc's?

["John Morawa" <morawaj-at-interaccess-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hello,

What is a "snubber cap"?  Mouser
http://www.mouser-dot-com/products/detail.cfm?MPart=5989-1.6KV.0047&CustRef=&sou
rce=search
has has these metalized, polypropylene, self healing, snubber caps
.047ufd, 1600vdc, 500vac for $0.79 ea in quantities over 100.  They have
the same in a 2kvdc, 500vac cap for $0.90 in 100+ quantities.  The  link
to the PDF catalog page has the specs at the bottom of the page.
How would these compare to say the seacor KP25 of the same value?
http://www.seacorinc-dot-com/Tables/high_pulse.htm

Thanks,
John M.