... , UL, CUL and RoHS Certificates. 1. CTV type three-phase SCR trigger plate is using digital circuit trigger thyristor realizevolatage ... furnace heating control. Load type is three -phase resistance load, three-phase inductive load and three-phase transformer load, Three-phase load can be center ungrounded load, ... contact me directly,any quertion will be appreciated. Three-phase SCR Trigger Controller