The fuse block is designed to provide fuse protection for low current (<3 Amp) 600VAC devices. Time Mark fuse blocks will accept 20mm or 32mm ceramic fuses for maximum flexibility. The fuse block includes three 20mm 1A fuses installed plus two spare fuses (SKU: 520078). Time Mark fuse blocks are available with screw terminals (-01) or FASTON 0.187 terminals (-02).