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Very useful for 3phase motor to prevent running during Single phase failure.
3 mode of operation
1. manual
2. SPP- Single phase prevention only
3. Auto (SPP with Delay ON Auto start)
widely used in agriculture pump motor.
Used with three phase starter panel where single phase loss prevention is very important.
it automatically stop the starter when ever one or more phase goes down or loss. it has auto start facility also with adjustable time delay