... SCR shift phrase trigger 1. signal phrase 220V, three phase 380V 2.Input signal: 0-5V,4-20mA ... 220V and three phase 380V. The module can receive the standard control signal of meter without connecting external synchronous booster or ... : Single phrase trigger moduleB3: Three phrase trigger module, three –phase three-wire diagramB4; Three phrase trigger module, three –phase four-wire diagram SCR shift ...