The Siemens 3RW5526-1HA16 is a soft starter from the SIRIUS family, rated for 200-690 VAC supply. The trip class is configurable between CLASS 10A / 10E (default) / 20E / 30E per IEC 60947-4-2 — that means the overload protection curve can be matched to the motor's thermal capacity. CLASS 10A is the standard for standard-start pumps and fans; CLASS 20E or 30E buys you longer start time for high-inertia loads like centrifuges or crushers without nuisance tripping. The ATEX and IECEx certifications (both Yes) allow installation in explosive atmospheres.
Fieldbus and control integration
This soft starter supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP — all listed as Yes. The analog output is configurable as 4-20 mA (default) or 0-10 V. Four parameterizable digital inputs let you wire external start/stop, remote reset, or a speed reference without adding an I/O block. The DC braking (Yes) and pump ramp-down (Yes) features are useful for stopping a pump without water hammer — the ramp-down extends the deceleration time so the fluid column doesn't slam back.
Mounting and enclosure fit
The unit measures 306 mm high, 185 mm wide, and 203 mm deep. Clearance requirements: 100 mm above, 75 mm below, 10 mm in front, 5 mm at the sides, 0 mm behind. That is a standard SIRIUS frame size — it fits a 600 mm wide enclosure with room for a main breaker and contactor on the same backplate. Screw terminals (Yes) for power and control wiring.