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Re: [T3] Electric/Mechanical Brake Switch


On Wed, 2005-10-05 at 21:00, Jim Adney wrote:
> On 6 Oct 2005 at 0:56, Dave Hall wrote:
> 
> > Each brake light is nominally 20W isn't it?  That makes the total current over 3
> > Amps DC, with momentary currents higher.  I have a bag of 30 normally-closed
> > microswitches here labelled 16(4)A at 250V AC.  I assume the 4A is continuous
> > and the 16A momentary.
> 
> That seems like an odd rating; I've never seen anything quite like it. For most 
> switches, the lion's share of the punishment comes when it's time to open the 
> circuit, as that's when the arc may strike. It hardly takes any copper to 
> conduct 4 A, but 16 A is quite a different story.
Most industrial switches will be rated like for make 16A, but break 4A,
since industrial load are usually inductive, they have a high inrush,
and an inductive kick on release.
Our Starter solenoids are this way. A diode in the right place would
probably make our 40 year old ignition switches last a lot longer.

-- 
Russ Wolfe
'71 FB AT
'66 FB MT
'64 T34 (not running)
'65 T1 (not running)
'05 KIA Sorento SUV
russw@classicvw.org
http://www.classicvw.org

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