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Bill, I have always used the CU200 ("Sorry, sir, that's what it costs to give you what you want...") when a float switch is called for (which is nine times out of ten) so I haven't done this, but: The only alternative to their proprietary product would be a means to break the incoming AC or DC feed to the pump. That means placing the float switch in line with the power supply ahead of the pump. A conventional float switch is likely to arc and soon fail, possibly closed. A mercury-switch float switch, intended for non-potable applications, would function at high DC voltages. I'm extrapolating this from memories of MDI (Mercury Displacement Industries) being used to control PV input DC on the APT/Ananda Powercenters of yore. The catch is that by including mercury, they can't meet standards for potable water. So if this is for a regulated facility like a public well it won't fly, but for a private homeowner you might offer it as a practical solution. (I used them a number of times in other pump applications before I learned of the potable/non-potable distinction, and never had one fail.) Allan Allan Sindelar On 4/20/2016 8:36 PM, Bill Hennessy
wrote:
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