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 These efficient overvoltage barriers contain both coarse and fine protection stages and provide longitudinal and a transverse surge protection.
The initial protection stage comprises a three-pole gas discharge tube and is designed to divert the primary surge energy. The subsequent fine protection stage is carried out using bi-directional silicon avalanche diodes. Care is taken in the design of this fine protection stage to avoid capacitive line loading and thereby ensuring a low insertion loss and wide operating frequency range. Series line impedances ensure energy co-ordination between the coarse and a fine protection stages at all levels of the incident surge. To protect against the hazards of electric shock and fire which often results when power frequency contact occurs between power and communication lines (often called mains incursion), a thermo-clip is included on the primary protection stage to divert the power frequency current to ground. The plug-in module/base design facilitates replacement of a failed module without the need to remove system wiring.  Datasheet |
