The BK1/S500-1-R is a fast-acting, low breaking capacity fuse from the S500 series, designed for overcurrent protection. It is rated for 1A and 250V AC and has an AC interrupting rating of 35A at its rated voltage. Key electrical characteristics include a typical DC cold resistance of 0.13 ohms, a typical melting I²t of 0.60 A²Sec, and a maximum voltage drop of 200 mV. This RoHS-compliant fuse is constructed with a 5mm x 20mm glass tube and nickel-plated brass endcaps, making it suitable for a wide range of electronic circuit protection applications.