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JJ10 reduce pressure and start switch board what JJ No. 1 reduce pressure and start switch board retrofit product suitable for exchanging 50 HZs by this series of products since coupling since coupling( or 60 HZs), The voltage is 380 Vs, the power is from 18. KW three-phase mice envelope 5 - type act as and reduce pressure and start, Having had year, lack many kinds of protection of holding up to electronic machines etc, this series of products are done while forming a complete set for the submersible pump of our factory specially, Increase electrical machinery exceed warm to protect by stator and water pump oil room leak and protect and make corresponding to show to troubles.