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Differentiate between two and three wire control.

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Two wire control: 
Three wire control
It provides low voltage release
It provides low voltage protection
IT will automatically start when power resumes
IT will automatically start when power resumes
It does not have sealing contact
It has sealing contact
It is not safe for operator
It is safe for operator
It is used for submersible pump motors which are located at remote locations 
Its is used for industrial control panels where safety is important 

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