121146 Cooper Bussmann BP/FRN-R-20ID 2 Pack, 20A, 250V, Indicating Fuse, Fusetron Dual Element, Time Delay, Current Limiting Class RK5 Fuse, Label Darkens If Fuse Has Opened, Applications, AC Power Distribution System Mains, Feeders Branch Circuits, Motors Motor Branch Circuits, Transformers Other Inductive Loads, Lighting, Heating Other Non-Inductive Loads, UL Listed, Dimensions: 2.375L x 1.375W x 0.25H, Carded.