The Siemens 3RW5517-1HA04 is a SIRIUS 3RW55 soft starter rated for 200... 480 V supply, making it suitable for standard three-phase motor loads across European and North American line voltages. Its Trip Class is configurable as CLASS 10A / 10E (default) / 20E / 30E per IEC 60947-4-2 — this governs how long the starter can carry the locked-rotor current during start. CLASS 10A is the tightest, protecting motors with short acceleration times; CLASS 30E allows longer ramp-ups for high-inertia loads like centrifuges or crushers. The default CLASS 10E is the standard for most pump and fan applications. The ATEX and IECEx certifications (both Yes) allow installation in potentially explosive atmospheres for soft-starting motors. For fieldbus integration, the 3RW5517-1HA04 supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP natively. This means it can drop into a Siemens S7 environment over PROFIBUS or PROFINET, or into a Rockwell/Allen-Bradley line over EtherNet/IP, without an external gateway. The Modbus TCP interface also suits legacy SCADA or third-party PLC retrofits.
The unit measures 170 mm wide by 275 mm high by 152 mm deep. Mounting clearances: 100 mm above, 10 mm in front, 75 mm below, 5 mm at the sides, and 0 mm behind. That zero-clearance rear requirement means it can sit flush against a panel backplate — useful for tight enclosures. The screw terminals accept solid conductors: 2x (1.0... 2.5 mm²) and 2x (2.5... 10 mm²), covering both control wiring and power connections up to 10 mm². The analog output is configurable as 4... 20 mA (default) or 0... 10 V, providing a real-time motor current signal to a PLC analog input or a local panel meter. Accuracy Class 5 per IEC 61557-12 means the measurement deviation stays within ±5 % of the reading — adequate for monitoring and trend analysis, not for precision metering.
The 3RW5517-1HA04 carries UL and CSA approvals, CE marking, and the ATEX/IECEx certifications listed above, so it meets North American and European regulatory requirements without additional agency review. The service factor of 1.15 allows a 15 % continuous overload above the motor FLA without tripping — useful for intermittent overloads in mixing or conveying applications.