Protect your Class J fuse blocks with the BUSSMANN CVR-J-60400-M cover. Designed for 600V and 400A applications, this cover provides essential protection for your high current circuits.The BUSSMANN CVR-J-60400-M is a cover for 400A Class J modular fuse blocks. It is designed for use with 600V systems and has a weight of 0.6 lbs. This cover does not feature a blown fuse indicator.