The Siemens 3RA8422-4EE00 is a pre-assembled intelligent load feeder — a direct starter combining a contactor, a motor-protective circuit breaker, and a communication interface in one DIN-rail-mountable unit for the ET 200SP system. Rated for motor currents from 3.5 A to 32 A at voltages up to 690 V AC, it provides type of coordination 2, meaning the starter can withstand a short-circuit fault without damage to the contactor or overload relay — the breaker clears the fault and the starter is still usable afterward. The unit integrates directly into a Siemens ET 200SP distributed I/O station, so it communicates over PROFINET or PROFIBUS via the backplane bus — no separate wiring for start/stop signals or feedback.
What is inside the assembly
The 3RA8422-4EE00 ships as a factory-assembled stack of three components: a 3RC7140-4EE01 communication module, a 3RV2321-4EC20 motor-protective circuit breaker, and a 3RT2027-2BB40 contactor.