AST-1 Electronic Soft Starter for 1-phase electric motors 

This video shows the soft starting and stopping of a household water pressure booster pump with AST-1 Electronic Soft Starter.
With the apply of soft starter, the water hammer problem could be eliminated and the loud noise when starting the water pump DOL could also be minimized.
So you won't be waken up by the pump at the middle of the night anymore if someone flush the toilet!!!
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