Active SIRIUS motor starter for AS-Interface — 1.25 A at AC-3
This 3RK4320-3DR51-0BA0 is a SIRIUS motor starter MCU designed for AS-Interface bus communication, configured as a direct starter with electromechanical switching contacts and bimetal motor protection.
IP55 enclosure, flexible mounting, AS-Interface integration
IP55 protection means the housing withstands dust ingress and water jets — suitable for washdown areas in food processing or outdoor cabinets where splash exposure is routine. Communication runs on AS-Interface protocol (supported per the spec), with a control supply voltage of 20.4–26.4 V DC — the same 24 V DC bus that powers AS-i slaves, so no separate control transformer is needed. Dimensions are 145 mm deep by 182 mm wide by 220 mm high — factor this footprint into the panel layout, especially the depth which is the tightest axis in shallow enclosures.
Motor protection and operating envelope
The bimetal overload relay provides motor protection with CLASS 10 trip characteristics — matched to standard AC motor start times, not extended ramp profiles. Short-circuit protection is provided by circuit-breakers (designed for that coordination), and the unit has no brake control output — it is a straight motor start/stop device.