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The PB3 GPD303 Drive is an Obsolete product in the Americas. Product was sold in the Americas under various brand labels, including EMS, Omron, Saftronics, and MagneTek GPD303 until 1995. From 3/4 to 5HP.
Technical Manual for GPD 303 Drive
Arc Flash and PPE Manual Supplement
Varispeed-606 PB3 Instructions