The Siemens 3RK1903-0AB10 is a terminal module for the ET 200S DS distributed DOL starter system, designed for applications where the supply line connection is handled separately.
This module mates directly with the ET 200S DS DOL starter without its own supply line connection — the power feed comes through a separate infeed module in the same distributed I/O station. The terminal block accepts the motor and control wiring from the field, while the backplane bus communicates start/stop and feedback signals to the ET 200S interface module. Panel builders should verify that the supply line connection is handled by a compatible infeed module (e.g., 3RK1903-0AB00 or similar) before committing the BOM.