nuckolls.bob(at)cox.net
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 Posted: Thu Mar 13, 2008 8:10 am Post subject: B&C S895-1 as start button for 20A/14VDC ciruit? |
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At 01:11 AM 3/9/2008 -0800, you wrote:
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Hi Bob,
Hope all is well with you 
I have a B&C S895-1 push button originally intended as a start buton;
however, the Eggenfellner recommendation for the starter circuit is for a
switch or push button capable of 20A/14VDC (switch will be connected to
the internal contactor on the Subaru H6 starter solenoid).
I have been reviewing both your Switch_Rating.pdf and the chapter in the
Connection, and I'm coming to the conclusion that this switch is probably
too light for this application. Would it work? Sure. For how long? Who
knows... But what would be the risk that I could fuse this switch closed
or just plain heat it up too much? Also, the connection leads on this
switch seem a bit small/light for 12AWG wire...
Please advise when you have a moment.
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The S895-1 switch would probably give a good service
life in this application. See:
http://www.aeroelectric.com/articles/Switch_Ratings.pdf
the REAL stress on this device will be the arcing
that takes place during release -AND- the openings
that occur during contact bounce at closure. Make
sure there's a diode from contactor (+) to ground.
I think B&C is supplying that switch with an MOV
already mounted. I recommended that about 10 years
ago during my brief love affair with MOVs . . .
turns out the diode is a MUCH more effective
solution to inductive energy management.
I'm wondering if the starter solenoid supplied
is the two-stage configuration described in
http://www.aeroelectric.com/articles/strtctr.pdf
If so, the 20A rating request by Eggenfellner
is probably an acknowledgement of the short term
energizing inrush unique to this design. The
wires supplied on that switch were tailored
to the starter contactor supplied in tht B&C
starter installation kit. Your application
would be better served with 16AWG wire and
a 15A fuse.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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