3.2 A AC-3 at 400 V, Class 10 — what it means on the line
The Siemens 3RK4353-3HR58-0BA0 is a SIRIUS motor starter rated 3.2 A in AC-3 duty at 400 V, which means it switches a standard three-phase induction motor up to that full-load current — think a 1.5 kW pump or small conveyor drive. That's the bimetal overload relay doing its job. It's a direct-on-line (DOL) design with electromechanical switching contacts and integrated short-circuit protection via circuit-breakers. The supply voltage range is 340…440 V AC, and the control coil takes 184…253 V at 50 Hz or 196…253 V at 60 Hz. One digital input is onboard — enough for a simple start/stop from a local pushbutton or PLC dry contact.
IP55 and mounting — panel placement reality
Dimensions are 182 mm wide, 220 mm high, 145 mm deep.