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 H SeriesAdvanced Ultra-High-Speed Technology; 66-Block The H-Series modules are ultra-high-speed fused solid-state secondary protectors for KEY/PABX systems. The units are available in three application-specific models. The H-Series is constructed with solid-state silicon foldback technology, polyswitch resettable fuses—PTCs—and failure fuses. The protective elements switch from the normal high impedance state to low impedance state upon a detection of a surge, then switch back to high impedance after the surge has subsided. This advanced protection circuitry provides the industry's fastest trip time for surge voltages as well as sneak currents (an electrical characteristic that is often overlooked in surge suppression). Each module is equipped with a test point for easy maintenance. The H-Series single-pair modules fit onto a standard M1-50 split block and replace the bridging clips. In addition, these modules require the EDCO MGB Ground Rail for each M1-50 block used.
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