Signal SPD can protect two-wire system. 1:low impedance 2: Suit for input hot resistance and thermocouple. Feature: 1 : Dimension: Widtch/thickkness/Height:79.6/54.6/6.2 mm 1), low residual,low leakage current. 2),Response time ≤ 25nS 30, Thermal release /Fuse function, quickly,response. 4), Show normal/unnormal: turn green: normal: turn red:unnormal. 5),Can ad to telecomm and equipment. 6),Can ...