NickParker
Electrical
What are the situations you put a two contactors in series? This circuit is for a heater feeder.
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Feeder - Two contactors in Series 3
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It is for personal or machine security.
If C1 fails C2 will stopp the heater and vice versa.
Since the spoles for the contactors isn't shown in the drawing I will make a guess that if C1 or C2 burns together it won't be possible to start the heater again until the contactor is "unstucked" read changed.
BR A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
If C1 fails C2 will stopp the heater and vice versa.
Since the spoles for the contactors isn't shown in the drawing I will make a guess that if C1 or C2 burns together it won't be possible to start the heater again until the contactor is "unstucked" read changed.
BR A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
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In a heater circuit, there is typically one contactor that is used generally for on-off control, so subject to wear and welding. The 2nd contactor would be connected to a High Limit temperature safety relay and separate sensor that only drops out that contactor if there is a thermal runaway situation and because that contactor is not subjected to constant wear and tear, it is more reliable in an emergency.
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" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
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As stated by Jeff and additionally that over-temp safety relay is usually a latched relay that requires a human to push a button to engage it.
Keith Cress
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Keith Cress
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