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HD4 Gas-Insulated MV Circuit-Breaker Technical Update

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This document announces the technical update of ABB's HD4 series gas-insulated MV indoor circuit-breakers for primary distribution, covering ratings up to 12/17.5 kV, 1250 A, and 25 kA. It details product changes, new commercial codes, interchangeability with previous types, type test certifications, and applicability guidelines for OEMs.

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