What this coupling module does in a star-delta starter
The 3RA2711-0DB00 is a coupling module that sits between an IO-Link or AS-i fieldbus and a communication-capable Siemens contactor (3RT20…-…..-0CC0) to enable a star-delta (wye-delta) motor start — without the usual separate terminal block for the transition wiring. The front face is finger-safe per IEC 60529, rated IP20 — meaning the live parts behind the module are touch-protected when the panel door is open, which simplifies commissioning access without needing an extra cover.
