On 8/11/2019 8:56 PM, Neil Unger 12348ung@gmail.com wrote: Gents, Nothing to do with flying, but you may be able to assist. I have numerous trash pumps that need a thermocouple linked to a 3 Phase cutout. Yes I can buy a stock unit for over $3000 each which to me is as hot as the pump can get. All I need is a switch that will cut out the pump (power) when it overheats due to dry running. If it doesn;t the pump then self destructs and $6000 later I am ready to go again. I can however get replacement pumps from china for $500 but without the cutout. So simple heat sensor switch that will go open at preset temp high setting, say 90 - 100 degrees C . Possibly single phase to disconect 3 phase contactor. Suggestions??> Neil. How about a 'snap switch'? https://www.google.com/search?q=snap+switch+thermostat&rlz=1C1CHBF_enUS843US843&oq=snap+switch&aqs=chrome.4.69i57j0l5.7136j0j7&sourceid=chrome&ie=UTF-8 They're used in everything from furnaces to coffee makers here in the USA. Charlie
Gents, Nothing to do with flying, but you may be able to assist. I have numerous trash pumps that need a thermocouple linked to a 3 Phase cutout. Yes I can buy a stock unit for over $3000 each which to me is as hot as the pump can get. All I need is a switch that will cut out the pump (power) when it overheats due to dry running. If it doesn;t the pump then self destructs and $6000 later I am ready to go again. I can however get replacement pumps from china for $500 but without the cutout. So simple heat sensor switch that will go open at preset temp high setting, say 90 - 100 degrees C . Possibly single phase to disconect 3 phase contactor. Suggestions??> Neil.