2 Pack, 40A, 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: 2.375"L x 1.375"W x 0.25"H, Carded.