The Siemens 3RK4353-3PR58-1BA0 is a SIRIUS MCU-controlled reversing motor starter designed for on-site assembly. It is a reversing starter, meaning it integrates two contactors with mechanical interlocking to reverse a three-phase motor without external wiring — a common requirement for conveyors, hoists, and actuator drives where direction change is needed.
The 12 A AC-3 rating at 400 V is the motor-switching current; for resistive loads (AC-1) the unit can carry higher current, but the AC-3 figure is the one that governs motor duty. Operating frequency is rated at 80 operations per hour minimum — adequate for intermittent reversing cycles but not for high-speed jogging. Supply voltage range is 340…440 V AC, with a control voltage of 184…253 V at 50 Hz or 196…253 V at 60 Hz. This covers standard 400 V three-phase networks with a wide tolerance band. The unit has 2 digital inputs for control signals, and motor protection is via a bimetal overload relay. Short-circuit protection is designed for circuit-breakers, and the main current circuit has 3 poles. There is no integrated brake control (no 24 V DC, 180 V DC, 400 V AC, or 500 V DC brake output), so if the application requires a motor brake, an external brake control unit must be added.
If a cross-reference is needed, the closest functional sibling in the SIRIUS family is the non-reversing base starter; the reversing function and the IP55 enclosure are the distinguishing features here.
Panel and machine integration notes
Dimensions are 145 mm deep, 182 mm wide, and 220 mm high. This is a self-contained unit — no DIN-rail mounting; it bolts directly to a mounting surface. The IP55 rating means it can be mounted outside a control cabinet, but the ambient temperature range of -25 to +35 °C must be respected; above 35 °C, derating applies. No fieldbus communication is built in — no PROFINET, PROFIBUS DP, or AS-Interface. Control is via hardwired digital inputs. For networked systems, an external gateway or a different SIRIUS variant with integrated bus would be required.