Siemens 3RK1901-1DG22-1AA0 Twin data decoupling module. Siemens 3RK1901-1DG22-1AA0 Power Supply - AS-i data decoupler 2 x 4 A Spring-type terminals, AS-i dual Data decoupling module IP20, SlimLine S22.5 spring-type terminals Overall width module 22.5 mm IN: 24 V / 30 V DC OUT: 2 x AS-i, 4 A Integrated overload protection Integrated ground fault detection Signaling contact Remote reset. Output voltage: 30 V DC, Rated current: 4 A.