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Well Google throws up this lot for float switches but for electronics, there are many more Hg switch manufacturers: 1) http://www.russell-scientific.co.uk/mercury_switches/automatic_float_switches.html 2) http://www.assemtech.co.uk/productpages/float_switches_uk.asp 3)...

Thank you very much for your most helpful observations. So, the bottom thing in the contactor box is an overload switch... Well, well, well (!)...so the contactor staying off randomly is not the fault itself but merely the symptom. How many times have I gone to fix the symptom, not...

A submersible well pump begins pumping when the mercury float switch in the water tank switches on a contactor. It stops when the water level in the tank raises the float and switches off the contactor/pump. For 15 years there was no contactor used and it worked well, indeed with no problems...