Mersen Ferraz Shawmut Fuse Block, Open Style, 250 VAC, 400 A, 3 Pole, 3, Class: R, Box Lug/Side Clip, 250 to 1000 kcmil Wire, Threaded Mount, For Use With: A2D-R, A2K-R and TR-R Series Fuse, Phenolic, 9.25 in L x 11.81 in W x 3.75 in H