5sHX26L4503 RC-IGCT Gate Unit RC-GCT Supply(20V ntemal Supply (without galvanic isolation to power circuit) Anode Circuit Command Signal ( Light) Cathode Fig 10 Block diagram ABB Switzerland Ltd, Semiconductors reserves the right to change specifications without notice. DOc. No. 5SYA1230-01 Feb 02 page 8 of 95SHX 26L4503 ABB Switzerland Ltd, Semiconductors reserves the right to change specifications without notice. Doc. No. 5SYA1230-01 Feb. 02 page 8 of 9 RC-IGCT Logic Monitoring Turn￾Off Circuit Turn￾On Circuit Gate Cathode Internal Supply (without galvanic isolation to power circuit) Supply (20VDC X ) 1 CS Rx Command Signal (Light) Anode Gate Unit RC-GCT Fig. 10 Block diagram