Sizing a SIRIUS soft starter for motor starting duty
The 3RW5246-6AC15: Trip class is selectable between CLASS 10A (default), 10E, or 20E per IEC 60947-4-2 — this sets the maximum allowable starting time before the soft starter's internal overload trips, so match it to the motor's acceleration profile and load inertia.
Fieldbus and control integration
The soft starter supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard communication — pick the network your PLC speaks; the PROFINET variant also enables PROFIenergy for coordinated energy management during idle phases. An analog output is configurable as 4-20 mA (default) or 0-10 V (parameterizable with the High Feature HMI accessory) — useful for feeding motor current or load status to a remote display or SCADA input. Firmware updates are supported, and an error logbook is available but only in conjunction with special accessories — plan for this during commissioning if fault history tracking is required.
Mounting and panel layout constraints
Fastening is by screw fixing; the unit measures 393 mm high, 210 mm wide, and 203 mm deep — verify the backplate layout and enclosure depth before cutting the gland plate. Mounting position is flexible: vertical mounting surface with +/-90° rotation and +/-22.5° tilt front-to-back — but the specified clearances must be observed: 100 mm upwards, 75 mm downwards, 10 mm forwards, 5 mm sideways, and 0 mm backwards. Shock resistance is 15 g / 11 ms, dropping to 12 g / 11 ms if potential contact lifting is a concern — relevant for mobile equipment or panels near rotating machinery.
Compliance and approvals across jurisdictions
The 3RW5246-6AC15 carries CE marking, UL approval, and CSA approval — accepted in European, US, and Canadian installations without additional certification work.