How does a time delay fuse work? A time delay fuse, also known as a short blow or slow melt fuse, is a special time of fuse that is designed to allow a surge in electricity for a short time before the fuse actually blows. Regular fuses do not allow for any spike over the current rating of the fuse. Three steps to select the right fuse for control circuit 1. Select the fuse type. Select from time-delay fuses for inductive loads or fast-acting fuses for resistive loads. 2. Select the voltage rating required. 3. Verify that the interrupting rating of the selected fuse is sufficient for the circuit application. How can you tell if a ceramic fuse is blown? 1. You can determine if a glass fuse in blown by performing a visual inspection and looking for a break in the thin wire and a brown discoloration in the center of the fuse. 2. Item packing Quantity: 2PCS (please let us know if you want different rating after you place the order we can send one each)