Features full use of switching voltage limiting type surge protector benefits from a combination of the two devices, with the action time is short, strong protection, no freewheeling, no zero-frequency current can arc, no leakage current without degradation, low voltage protection level, and long life. Outlet end of the transformer for the substation, feeder container into the line side, so that your electrical equipment from direct lightning hit the building, transmission and distribution lines or outdoor action caused by lightning surge current, over-voltage damage, allows you to power distribution systems and equipment with high reliability. Technical parameters Model 
 TDX-DF33 
 Standard 
 GB18802.1, IEC61643.1 
 Maximum continuous operating voltage Uc 
 275V AC (LN) 
 Normal operating voltage UN 
 220V AC (LN) 
 Response Time 
 <100ns 
 Voltage protection level Up (20KA, 8/20us) 
 <1200V 
 Max Surge Current 
 25KA (10/350μS) 
 Nominal discharge current 120KA (8/20μS) lightning counter 
 Optional 
 Size 
 120 × 36 × 60mm 
 Maximum allowed back-up protection 
 250A fuse 
 Protection class 
 IP20 
 Operating temperature range 
 -40 ~ 70 ℃ 
 Relative humidity 
 ≤ 95% 
 Installation 
 35mm rail 
 Product warranty 
 Five