These Blue Sea Systems rib insulators are a great way to organize AC and DC wires. Commonly used to extend or create junctions in wiring harnesses and cables, these compact terminal blocks are 7/8" wide and provide space to join 2 individual circuits. Ideal for creating a break in existing wiring when disassembling a boat for transport. Separate busbars with terminal screws ensure that each circuit is isolated from adjacent circuits. The nylon or phenolic block isolates power from the mounting surface. In applications that require several circuits to be joined, jumpers to match current ratings of the terminal block are available to create common circuits. Sized to match the current loads, make sure that the block you choose is rated to carry the current required and has enough terminals, plus some room for expansion.