... RoHS Certificates. 1. CTV type three-phase SCR trigger plate is using digital circuit trigger thyristor realizevolatage-regulation controller ,;2. Voltage regulating ... , can choose current limiting, over-current protection etc.3. The trigger plate with 0-5V, 4-20mA intelligent PID adjustor or ... me directly,any quertion will be appreciated. Three-phase SCR Trigger Controller