The Siemens 3RK1304-5KS40-4AA0 is a current-production SIMATIC direct motor starter with a 24 V DC control supply, IP65 enclosure, trip class 10 overload protection, and dual PROFINET and PROFIBUS DP connectivity. It provides 2 bytes of input and output data over the network, with no digital I/O on the unit itself—signal interfaces are via M12 sockets for the motor connection. The 150 x 110 x 230 mm footprint and screw fixing let it land on a backplate or in a cabinet, and the IP65 rating keeps the electronics clean on the machine frame.
Ratings that drive fit
This motor starter has Trip Class 10 overload protection. Supply voltage range is 20.4 to 28.8 V DC, so a 24 V DC bus with 5% regulation covers it; note the rated value is 24 V DC exactly. Short-circuit breaking capacity at 400 V AC is 100 kA (rated conditional), giving overhead for high-fault panels. Vibration resistance is 2 g, shock resistance 15 g / 11 ms—tough enough for machine-mount near the motor.
Sourcing and lifecycle
Lifecycle status is current—no end-of-life or last-time-buy window. The 3RK1304-5KS40-4AA0 can be specified into new designs and added to existing BOM lines without obsolescence planning.