What this terminal block does in an ET 200S station
The 3RK1903-2AA10 is the TB PEN terminal block for the Siemens ET 200S distributed I/O system — it mounts in the center of the station and provides the PEN (protective earth neutral) connection for a starter with a load connection. This is a Remote I/O & Fieldbus Modules line item, meaning it lives inside the ET 200S IP20 enclosure, not on the machine side.
Lifecycle and compliance — active, RoHS-dated
Substance prohibitance date is 05/01/2012, which aligns with the EU RoHS compliance cutoff for the ET 200S family.
Panel fit — center slot, starter PEN bus
Designed for the center mounting position in the ET 200S rail assembly — the PEN terminal bridges the protective earth to the starter module's load side.