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Tool Talk Discussion Forum

Re: Sparkie Question

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old

01-04-2013 17:42:44
209.86.226.32



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Sounds wrong to me since a breaker or a fuse does the same thing. Only difference in the 2 is one burns out and you throw it away the other you just flip it back on but either way either one burns out or flips due to an over loaded circuit




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John T

01-04-2013 19:18:58
216.249.82.117



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 Re: Sparkie Question in reply to old, 01-04-2013 17:42:44  
May "sound wrong" but actually its right, EITHER a fuze or circuit breaker is there to protect the branch circuit feeder wires,,,,,,While a thermal overload device (called heaters or thermals in a magnetic motor starter) is there to protect the MOTOR and its a device thats sorta like a fuze in that a link melts open to open the circuit so the motor cant over current or overheat.

There are TWO seperate protective functions involved with powering a motor, 1) A fuze or circuit breaker to protect the branch circuit feed wires, 2) A thermal overload device (thermals or heaters if in a magnetic starter act sorta like a fuze) to protect the motor and you need BOTH for best protection....

Hope this helps

John T

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