Motor starting capacity and trip class
The 3RW5245-6AC14: Rated 135 A minimum with a voltage range of 200 to 480 V, this SIRIUS soft starter covers the common low-voltage motor sizes in industrial plants — 75 kW at 400 V is a typical fit, though the exact motor FLA determines the frame. Trip class is configurable: default Class 10A, with selectable 10E and 20E per IEC 60947-4-2. The minimum load is 15% relative to the smallest settable Ie — important if you're soft-starting a lightly loaded pump or fan that draws well below the starter's full range.
Fieldbus and control integration
Native PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard communication are all on board — no external gateway needed for most modern PLC networks. PROFIenergy support is available when paired with the PROFINET communication module. Analog output is 4-20 mA default, parameterizable to 0-10 V with the High Feature HMI accessory. Remote reset is achieved by cycling the control supply voltage — useful for unattended restart after a fault clears. Firmware updates are supported, and an error logbook is available with special accessories — helpful for commissioning diagnostics and post-fault analysis.
Panel mounting and clearances
Screw-fixing mount, 203 mm deep, 210 mm wide, 393 mm tall. Mounting position allows vertical surface rotation ±90° and tilt ±22.5° front-to-back — not a strict upright-only requirement, which helps in tight enclosures. Required clearances: 100 mm above, 10 mm in front, 0 mm behind, 75 mm below, 5 mm to the side. The zero rear clearance means the unit can sit flush against the back panel — useful when gland plates or busbars limit depth. Shock resistance is 15 g / 11 ms, dropping to 12 g / 11 ms with potential contact lifting — spec this for mobile or vibrating equipment.
Approvals and compliance documentation
CE marking, UL approval, and CSA approval are all confirmed on this variant. The product category is hybrid switching devices under the SIRIUS brand. Service factor is 1 — no built-in overload margin beyond the set current; the trip class handles the protection. Torque control is not supported; this is a standard voltage-ramp soft starter, not a closed-loop torque controller.