The Siemens 3RW5544-2HF14 soft starter carries ATEX and IECEx certification. Rated voltage is 200 to 480 V, trip class selectable per IEC 60947-4-2. The unit includes a service factor of 1.15, allowing a 15% continuous overload above the rated motor current — useful for pumps or fans that occasionally run above nameplate.
Fieldbus and monitoring
This soft starter supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP natively, so it drops into most common industrial networks without an external gateway. PROFINET is available via a communication module, and PROFIenergy is supported with the PROFINET High-Feature module for energy management during idle phases. The analog output can be configured as 4-20 mA or 0-10 V for forwarding motor current or other process values to a PLC or SCADA. Built-in monitoring includes an event list, error logbook, trace function, and motor heating model. The B10d value is 147,000 cycles.
Dimensions are 210 mm wide, 393 mm high, and 203 mm deep. Clearance requirements: 100 mm above, 75 mm below, 10 mm in front, 0 mm behind, 5 mm at the sides. The 0 mm rear clearance means it can sit flush against a backplate, saving enclosure depth. The unit uses spring-cage terminals (no screw terminals), which speeds wiring and resists vibration loosening.