BOJACK 20 Pcs High Quality Fast-blow Glass FuseFuse Dimension:5x20mmFuse Current: 0.25AFuse Voltage: 250VThe role of the fuse:When a circuit malfunctions or is abnormal, the current is constantly rising, and the increased current may damage some important components or valuable components in the circuit, or it may burn the circuit or even cause a fuse will cut off the current when the current abnormally rises to a certain height and a certain time, thereby protecting the safe operation of the circuit.