... UL, CUL and RoHS Certificates. 1. CTV type three-phase SCR trigger plate is using digital circuit trigger ... phase-lacking protection, on electricity slow starting, the slow turn off, radiator overtemperaturedetection, can choose current limiting, over-current protection etc.3 ... . Load type is three -phase resistance load, three-phase inductive load and three-phase transformer load, Three-phase load can ...