The Siemens 3RW5526-1HF04 is a SIRIUS soft starter with a rated voltage range of 200 to 480 V, covering the common three-phase motor voltages across 208 V, 230 V, 400 V, and 480 V systems without needing a separate tap changer. The trip class is field-selectable among CLASS 10A, 10E (default), 20E, and 30E per IEC 60947-4-2 — this means you match the overload protection curve to the motor's starting characteristic: CLASS 10A for standard-start pumps and fans, 20E or 30E for high-inertia loads like centrifuges or crushers that need a longer acceleration ramp. The ATEX and IECEx approvals (both Yes) certify the device for use in explosive atmospheres (Zone 1/21 or Zone 2/22) when paired with appropriately rated motor and cabling, so it directly replaces a standard soft starter in a hazardous-area motor control center without adding an external isolation barrier.
Fieldbus and control integration
Communication is handled natively: Modbus RTU (RS-485), Modbus TCP, PROFIBUS, and EtherNet/IP are all supported on this order code. That means the starter connects directly to a PLC rack or plant DCS without an external gateway — the Modbus TCP port plugs into a standard switch, and the PROFIBUS DP interface uses the same connector as the rest of the SIRIUS family. The analog output is configurable for 4-20 mA or 0-10 V, giving the control system a live motor current signal for trending or alarming. For commissioning, the firmware is field-updatable, and the integrated event list and error logbook store the last several trips with time stamps — useful for diagnosing intermittent overloads on a remote line.
Panel layout dimensions
The enclosure dimensions are 306 mm height, 185 mm width, and 203 mm depth — a standard SIRIUS frame size that fits a 400 mm wide MCC bucket or a 600 mm deep enclosure with the door closed. Clearance requirements: 100 mm above, 75 mm below, 10 mm in front, 5 mm at the sides, and 0 mm behind. These are the minimum free-air gaps for natural convection cooling; if the starter is mounted in a sealed cabinet or next to other heat-generating devices, expect to derate the continuous current or add forced ventilation.
No lifecycle status is on record for this order code — the part is not flagged as obsolete, NRND, or end-of-life in the available data. That means it remains a current catalog item in the SIRIUS soft starter family.