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DS251 and DS271 RCBO Installation and Operation Manual

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This document provides installation, operation, and testing instructions for ABB SACE RCBOs (Types DS251 and DS271), including mounting on DIN rails, connection of phase, neutral, and functional earth leads, and monthly functional testing. It also covers fault diagnosis, insulation testing precautions, cleaning guidelines, and maximum permissible earthing resistance values for residual current protection.

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