CP3L2.5 is three level feed through Terminal Block. This is a practical solution for creating high density wiring circuits. CP3L2.5(I.S) is a three level internally shorted version and is an ideal choice for distribution circuits. CP3LG2.5 has 2 levels of feed through function with a grounding feet on the third level. In CP3LG2.5(I.S) all three levels are internally shorted to the ground contact. CP4LG2.5 is 3 level feed through Terminal Block with a grounding feet on the fourth level. This is suitable for three phase wire connection applications.