The Siemens 3RK1903-0AE00 is a 15 mm power bus jumper designated L123 for the ET 200S distributed I/O system. It distributes the supply voltage across adjacent ET 200S modules, eliminating the need for individual wiring to each module's power terminals.
The substance prohibitance date is 05/01/2012, confirming compliance with RoHS and REACH substance restrictions as of that date. This part carries a declaration of conformity from Siemens covering the ET 200S system-level certifications, including CE and UL for the bus jumper as an integral component.