... UL, CUL and RoHS Certificates. 1. CTV type three-phase SCR trigger plate is using digital circuit trigger thyristor realizevolatage-regulation ... isolation,Insulation voltage: ≥2000vac 1min, ≥2500vac 1minOperating temperature : -40°C---80°CStorage:Good ventilation, no radiator, no corrosive, moisture capability, 90 ... me directly,any quertion will be appreciated. Three-phase SCR Trigger Controller