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