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Contractors and O/Ls Generally Speaking

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A few questions please.

1. Being a cheap skate and having a 3 HP contractor and thermal overload, I want to use it for a 1 HP irrigation pump.  My thinking is that if the pump fails, the current will head towards S/C and trip the pump. I can set the thermal overload to 11 A.

Wrong thinking? 

2. Why don't 300 W pumps seem to be set up with a contactor and thermal overload? Maybe they have a relay or contactor but no a thermal overload. 

Wrong observation?

3. For an 85 W submersible pump, how would you protect It?

 

20210206_171114.jpg

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It always works when I put a question on a forum. If I think about it long enough I come up with the answers. ????

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