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TRB Series Zener Tripping Units Schematic and Drilling Plans

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This document provides schematic diagrams and outline drilling plans for a series of Zener tripping units, including Types TRB, TRB-1, TRB-2, TRB-3, and TRB-4. It details internal schematics, optional configurations, and physical mounting dimensions for these protective relay tripping devices used in DC trip bus systems.

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