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        MCO4110: This Modular Protector Protects Up to 8- Wires (4-pairs) Using 110 Punchdown Block on the Input and 110 Punchdown Block or Four RJ-11 or Two RJ-45 on the Output.  UL 497A Secondary Protector Approval.
         
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        MCO8110: This Modular Protector Protects Up to 16-Wires (8-pairs) Using 110 Punchdown Block on the Input and 110 Punchdown Block on the Output.  UL 497A Secondary Protector Approval.
         
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        MCO25: This Modular Protector Protects 25-Pairs Using RJ-21X (Amphenol) Connectors (Pins 1-50, Male In / Female Out).  UL 497A Secondary Protector Approval.
         
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        MCO4: This Modular Protector Protects up to 4-Wire (2-Pairs) per Jack.  Using RJ-11/45 Connectors (2 In or 2 Out, Pins 3 & 6 and 4 & 5 Protected).  UL 497A Secondary Protector Approval.
         
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        MCO4X4: This Modular Protector Protects up to 2-Wire (1-Pair) per Jack.  Using RJ-11/45 Connectors (Pins 4, 5).  UL 497A Secondary Protector Approval.