Siemens 3RX9503-0BA00 AS-Interface Power Supply IP20 with Integrated Ground-Fault and Overload Detection. Siemens 3RX9503-0BA00 Power Supply - AS-i Power 8 A 120 V / 230-500 V AC AS-Interface power supply unit, IP20 IN: 120 V / 230-500 V AC OUT: AS-i, 8 A (30 V DC) with integrated ground fault detection, with integrated overload detection with AS-i data decoupling. Output voltage: 30 V DC, Rated current: 8 A.