Specification: Product Name Ceramic Fuse Type Fast Blow Breaking Voltage 250V Breaking Current 250mA Dimension 5 x 20mm/ 0.2" x 0.8" (D*L) Material Ceramic , Metal Package 10Pcs x Ceramic Fuse Description: Designed with 5 x 20mm ceramic tube, 250mA breaking current. A type of low resistance resistor that acts as a sacrificial device to provide overcurrent protection, of either the load or source circuit.