The Siemens 3RW5215-1AC15 is a hybrid switching device in the SIRIUS soft starter family, designed for three-phase induction motor starting on 200-600 V supplies with a minimum operating current of 11.5 A. The Trip Class defaults to CLASS 10A per IEC 60947-4-2, with selectable 10E or 20E for heavier starting duty — meaning it protects the motor during start-up by limiting current and then dropping out of the circuit once the motor reaches speed, without the mechanical wear of a contactor across every start cycle. Rated for 200-600 V, this unit handles common global line voltages including 208, 240, 400, 480, and 575 V without a transformer tap change. The 11.5 A minimum matters when sizing for lightly loaded motors — if your motor full-load current sits below that threshold, the starter may not regulate properly, so verify the motor FLA against the minimum load of 15% relative to the smallest settable Ie.
Communications and control
This soft starter ships with onboard support for PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard — five fieldbus protocols covering most PLC ecosystems without an external gateway. The control supply voltage accepts 110-250 V at both 50 and 60 Hz, so it fits panels wired for either North American or IEC control voltages. An analog output provides 4-20 mA (default) or 0-10 V (parameterizable with the High Feature HMI) for feeding motor current or load status to a PLC analog input or panel meter. Remote reset is accomplished by cycling the control supply voltage off then on — no separate reset terminal needed. The unit supports soft torque for gentle starts on conveyors or pumps, and a dedicated pump ramp down feature for controlled deceleration that prevents water hammer in piping systems. There is no torque control function — this is a voltage-ramp soft starter, not a closed-loop torque controller.
Dimensions are 275 mm high, 170 mm wide, and 152 mm deep. Mounting is by screw fixing on a vertical surface; the unit can be rotated ±10° and tilted forward or backward. Required clearances: 100 mm upwards, 75 mm downwards, 10 mm forwards, 5 mm at the side, and 0 mm backwards — meaning the back can sit flush against the panel backplate. Power wiring accepts solid conductors: 2x (1.0-2.5 mm²) and 2x (2.5-10 mm²) per terminal.
For a BOM line requiring this exact order code, confirm fit by cross-referencing the 200-600 V rating and 11.5 A minimum against your motor nameplate.