Switch to turn off water pump when water supply interrupted


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Hi. In our Mexican hideaway, we have a small cistern that gets filled with city water. This feeds a pump which keeps a 10 gal pressure tank filled when city pressure declines. Recently we discovered our cistern had run dry, and the pump was churning away (dry) trying to fill the pressure tank. The cistern has a simple float that allows it to be filled. I am told I can get/install a switch from that float that would prevent the pump from running if the cistern runs down too far.
I don't know the terminology for this switch, but would like to research it, buy it and hopefully install myself. Qualified pros around here are booked out for weeks. Advice on sites, youtubes or similar appreciated.
Tnx
 
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You need a float switch. They have them at Home Depot.

Model #EBFSWPB

You need a float switch that will OPEN it's contacts when it hanging by way of gravity only....no water floatation. This way, the float will permit the operation of the upstream pump motor (with it's existing controls, if any) provided the device is floating in water....hence, no water = no floating = pump motor cannot start.

BTW: Your pump motor might be fine, but the pump itself could be dead now. Pumps should not be operated dry.
 

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