The 3RK4353-3LR58-0BA0 is a Siemens SIRIUS motor starter — an MCU-controlled direct starter with electromechanical switching contacts and bimetal motor protection. Supply voltage is 340…440 V AC, with the control voltage accepting 184…253 V at 50 Hz or 196…253 V at 60 Hz. The operating frequency range is 50/60 Hz, and the unit is rated for a minimum of 80 operations per hour. Ambient temperature during operation is -25 to +35 °C, so it is suited for unheated indoor enclosures but not for direct outdoor exposure without additional climate control. The IP55 enclosure means the unit is dust-protected and protected against water jets from any direction — suitable for installation in washdown areas or dusty industrial environments, though not for submersion or high-pressure spray.
Communication and integration
This starter has no onboard fieldbus communication — no PROFIBUS DP, no PROFINET, no AS-Interface protocol support. It carries one digital input for local control. If your line requires network integration, you will need to add an external gateway or use a different SIRIUS variant with the communication module. The unit is a standalone direct starter with short-circuit protection provided by upstream circuit-breakers. Dimensions are 182 mm wide, 220 mm high, and 145 mm deep — a compact footprint for a 6.3 A motor starter with integrated overload protection. The 3-pole main current circuit is designed for three-phase motor loads. No brake control output is included, so applications requiring DC or AC braking will need a separate brake controller.