The Siemens 3RW5516-1HA14 is a SIRIUS 3RW55 soft starter designed for three-phase induction motors in industrial applications. It carries ATEX and IECEx certification, meaning it is approved for use in potentially explosive atmospheres — a key requirement for chemical, oil and gas, or grain-handling lines where a standard soft starter would be a safety risk. Rated for 200-480 V and configurable for trip classes 10A, 10E (default), 20E, or 30E per IEC 60947-4-2. The trip class determines how long the starter can carry locked-rotor current during start; Class 10A is the tightest, protecting motors with short acceleration times, while Class 30E suits high-inertia loads like centrifuges or long conveyors.
Fieldbus and control integration
This unit includes onboard PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP — covering the three dominant industrial Ethernet protocols plus legacy PROFIBUS. That means it drops into a Rockwell, Siemens, or Schneider control architecture without a gateway. PROFIenergy support is available when paired with a PROFINET communication module, allowing the drive to shed standby power during production pauses. The event list and error logbook store the last several fault events locally, which speeds troubleshooting on a line-down call.
The 3RW5516-1HA14 measures 275 mm high, 170 mm wide, and 152 mm deep. Screw terminals accept solid conductors: two per phase for 1.0-2.5 mm² and two for 2.5-10 mm². Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm to the side, and zero backward. These are the minimum free-air spaces needed for heat dissipation; crowding the enclosure raises the ambient temperature and derates the unit.
The part carries current approvals (UL, CSA, CE) and supports firmware updates.