SIRIUS reversing starter for AS-Interface — form factor and fit
The 3RK4320-3DQ51-1BA3: It carries a rated current of 1.25 A at AC-3/400 V and operates on a 340-440 V supply at 50 or 60 Hz. The enclosure measures 205 mm deep by 245 mm wide by 215 mm high, with IP54 ingress protection — suitable for panel environments where dust and splash are present.
Motor protection and control — Class 10 bimetal overload
The short-circuit protection is designed for circuit-breakers, and the switching contacts are electromechanical. Control supply is 20.4-26.4 V DC, and the starter includes a motor brake output with 400 V AC brake control. Two digital inputs are available for local control signals, and the unit supports AS-Interface protocol for fieldbus communication. The unit is rated for both low demand rate (50%) and high demand rate (75%) per SN 31920, indicating suitability for safety-related applications with defined proof-test intervals.