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jpcw
PostPosted: Apr 22nd, '09, 15:47 
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Lungy wrote:
Try one of these when the coil is powered by 240v ac one circuit is held open (no need to connect to this side)when power fails the other circuit is activated use 12 v from battery as the input source and the power fail leg to your pump,aerator etc
http://www.jaycar.com.au/productView.as ... rm=KEYWORD

Yep that would be a cheaper and simpler solution. Although if the slave switch works on a 12DC load then it would have the added advantage of tripping if the main pump went open circuit (ie burnt out) but the main power remained. Probably not all that likely though.
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