Soft starter for motor starting — 200-690 V, trip class 10A/10E/20E/30E
The Siemens 3RW5526-3HA06 is a soft starter designed for three-phase induction motor starting, covering a wide voltage range of 200 to 690 V. Its trip class is configurable between CLASS 10A, 10E (default), 20E, and 30E per IEC 60947-4-2, letting you match the thermal overload protection to the motor's start profile — 10E for normal starts, 30E for high-inertia loads. It carries ATEX and IECEx approvals for explosive atmospheres, plus CE, UL, and CSA marks, so it fits into hazardous-area motor control centres and export panels without additional certification work.
Fieldbus and control features
The unit supports Modbus RTU, Modbus TCP, and EtherNet/IP natively — no separate communication module needed for those protocols. PROFIBUS and PROFINET with PROFIenergy are available via optional communication modules. Control features include voltage ramp, torque control, breakaway pulse for high-friction loads, pump ramp down to avoid water hammer, DC braking, and combined braking. The analog output can be set to 4-20 mA or 0-10 V for feedback to a PLC or drive. A built-in event list, error logbook, and trace function help with commissioning and fault diagnosis — the trace captures motor current and voltage profiles during start-up for later analysis.
Sourcing and lifecycle — active production
Dimensions are 185 mm width, 306 mm height, and 203 mm depth. Clearance requirements: 100 mm above, 10 mm in front, 0 mm behind, 75 mm below, and 5 mm at the sides. The unit uses screw-type terminals (: no screw terminal — likely spring/clamp type; verify termination style before wiring). Service factor is 1.15, and the accuracy class is 5 per IEC 61557-12 — suitable for applications requiring moderate measurement precision.