Soft starter for motor control panels — 90 A minimum, Class 10A trip
The Siemens SIRIUS 3RW5243-6TC15 is a hybrid switching device — a soft starter — sized for motor loads drawing a minimum of 90 A, with a rated voltage range of 200 to 600 V. It sits in the SIRIUS product family, Siemens' modular motor-control platform for industrial panels. The trip class is configurable: default Class 10A, with selectable Class 10E or Class 20E per IEC 60947-4-2. It supports soft torque and pump ramp down — the pump ramp down feature gradually reduces voltage on stop to prevent water hammer in pumping applications. No torque control or analog output is available on this variant.
Fieldbus connectivity — PROFIBUS, Modbus, EtherNet/IP, PROFINET
The 3RW5243-6TC15 includes onboard PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard communication. PROFIenergy is supported in conjunction with the PROFINET standard communication module — useful for energy management during production pauses. Firmware updates are possible via the fieldbus interface. An error logbook is available only with special accessories — if diagnostics logging is required for commissioning or fault analysis, budget for the accessory module. Remote reset is accomplished by cycling the control supply voltage. Auto-reset is also supported — configure per application safety requirements.
Mounting, clearances, and thermal derating
The unit is screw-fixed to a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front-to-back. Minimum clearances around the enclosure: 100 mm above, 10 mm in front, 0 mm behind, 75 mm below, and 5 mm at the sides. Shock resistance is 15 g for 11 ms, dropping to 12 g / 11 ms if contact lifting is a concern. Dimensions: 203 mm depth, 210 mm width, 393 mm height. The minimum load is 15 % relative to the smallest settable Ie — ensure the connected motor does not fall below this threshold for proper overload protection.
Approvals and compliance documentation
The 3RW5243-6TC15 carries UL approval, CSA approval, and CE marking — covering North American and European regulatory jurisdictions. These are the standard compliance documents a Capex project buyer expects for panel certification. Service factor is 1 — no continuous overload margin beyond nameplate rating. The product category is hybrid switching devices, combining semiconductor and electromechanical switching elements.