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- 66 Block Primary or Secondary 75V Surge Protector- UL Primary and Secondary listed with 350mA fuse for voice/fax/modem line (75V) - Dual Indicator Lights: Protection OK and Ground Connection OK - Solid-State Protection - Single Pair Protection: Protect only the lines requiring protection - Ideal for Retrofit Applications: Just remove the bridging clips from the block and replace them with the Protector add the ground connection and the pair is connected - Grounding Requirements: Field-installed solid copper wire - Recommended Grounding Impedance: