LYD2-B SPD Grade B specification: 60-100KA, 40-80KA, 30-60KA Feature :1. Technology of Inner overcurrent and over heat protection , temperature control break circuit .2. Module design, convenienct installing, replace online.3. small leak current, quick response time, low residual voltage.4. visible window show operating status, green: normal, red: abnormal. LYD2-B Surge Protection Device