That push button switch works well except for the occasional broom wielding 
Pennsylvanian. :-)

You can find that switch at most auto parts stores.

ST
  

On Tuesday, July 29, 2014 7:42:29 AM UTC-4, Joe Sommer wrote:
>
> On Monday, July 28, 2014 9:06:07 PM UTC-4, RocketMan wrote:
>>
>> I’ve been thinking of using the external switch to supply power to relay 
>> windings and using the relay to supply the main tank power. What do you 
>> think ?
>>
>
> Doug and Frank, 
>
> Using relays to control main power negates the concept of a 
> true external master kill switch.  Rough battlefield conditions
> could cause relay contacts to weld closed.
>
> I require all of our student-built vehicles to have an external
> master power switch.
>
> Personally, I recommend the 75A push-pull switch from
> Robot Marketplace.  It is relatively compact and has never
> failed for us.  The only downside is that you might get accidental
> shutdown by backing into an object.  Conversely if you get a 
> runaway vehicle during testing, you simply swat it in the ass
> with a broom. 
> http://www.robotmarketplace.com/products/0-SW75.html
>
> That said, I have no problem for tanks in our hobby to use
> relay kill switches.  However I recommend to include a true
> master power switch somewhere albeit internal.
>
> Joe
>
>
>
>

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