The input and output channels of the Bus Terminal have a common ground potential. The run LEDs give an indication of the data exchange with the Bus Coupler.
ABB 5SHY35L4520 Asymmetric Integrated GateCommutated Thyristor ,Mounting force 40kN High snubberless turn-off rating,Optimized for medium frequency,High electromagnetic immunity,Simple control interface with status feedback AC or DC supply voltage