SIRIUS motor starter for AS-Interface networks
The 3RK4320-3EQ51-0BA2: Motor protection is handled by a bimetal overload relay with a Class 10 trip characteristic, so it clears overloads quickly enough to protect the motor winding before thermal damage sets in — typical for conveyor and pump starts where the acceleration time stays under 10 seconds.
AS-Interface integration and control supply
This unit communicates natively on AS-Interface (the protocol is supported), which means it connects directly to an AS-i master without a separate fieldbus coupler — the control supply voltage is 20.4 to 26.4 V DC, matching the standard AS-i bus power range, so it draws its logic power from the same yellow flat cable that carries the data. It carries 2 digital inputs onboard, allowing local sensors (e.g., limit switches or proximity detectors) to be wired directly to the starter rather than back to a remote I/O block — this reduces cabinet wiring and speeds commissioning on modular machines.
Mounting flexibility and environmental rating
The enclosure measures 205 mm deep by 245 mm wide by 215 mm high, with IP54 protection — this means it is dust-protected and splash-proof, suitable for installation in control cabinets on the factory floor where occasional hose-down or dust is present, but not for direct washdown zones. Mounting position is flexible: the unit can be rotated ±180° on a vertical surface and tilted forward/backward by ±22.5° on a vertical mounting surface — this helps when fitting into tight enclosures or angled sub-panels where straight vertical mounting is not possible.
No official successor or cross-reference part is recorded — this is the current designator for this AS-Interface motor starter variant. Short-circuit protection is provided by circuit breakers (not fuses), which aligns with modern panel design practices where resettable protection is preferred over fuse replacement.