The Siemens 3RW5075-2AB15 is a SIRIUS soft starter rated for a minimum load current of 160 A, with Trip Class 10A / 10E (preset) / 20E per IEC 60947-4-2. This means it protects the motor during start-up by limiting current and managing thermal stress — the trip class selection determines how long the soft starter can sustain the starting current before bypassing. For high-inertia loads like centrifuges or large fans, the 20E setting gives a longer ramp window; for standard pump or conveyor starts, the 10A preset keeps thermal buildup tight. ATEX and IECEx certification qualifies it for explosive atmospheres. The unit mounts via screw fixing with a 282 mm depth, 160 mm width, and 230 mm height.
Fieldbus & Control Integration
Onboard fieldbus support covers PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP. That means the 3RW5075-2AB15 drops into a PROFINET plant or a Modbus TCP backbone without an external gateway. The analog output is configurable as 4-20 mA (default) or 0-10 V for feeding motor current or load status back to the PLC — useful for condition monitoring on a pump or conveyor line. Remote reset is handled by cycling the control supply voltage. PROFIenergy support requires the PROFINET communication module — that lets the soft starter participate in coordinated energy-saving shutdowns during production pauses.
Environmental & Mounting
In a non-air-conditioned panel near a furnace or in a Middle East plant, plan for the derating curve. Clearance requirements: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, and 5 mm at the sides. The zero backwards clearance means it can sit flush against the back panel — good for shallow enclosures.