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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports 3RW3950-6DC48 quotations, manuals, configuration checks, and exact-control-section matching.

        3RW3950-6DC48

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Siemens 3RW3950-6DC48 is a 230 V AC SIKOSTART 3RW34 control section that manages the starter sequence and status functions of a compatible soft starter.
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        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
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        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 3RW3950-6DC48

        • Manufacturer:
          Siemens
        • Part Number:
          3RW3950-6DC48
        • Product Family:
          Siemens Drives & Motion Control
        • Product Type:
          SIKOSTART 3RW34 Control Section
        • Stock:
          1
        • Control Voltage:
          230 V AC
        • Compatible Starter Series:
          SIKOSTART 3RW34..-0DC4.
        • RUN Input Current:
          10 mA
        • Minimum ON Voltage:
          170 V AC
        • Minimum ON Current:
          6 mA
        • Maximum OFF Voltage:
          80 V AC
        • Maximum OFF Current:
          3 mA
        • Input Impedance:
          27 kΩ
        • Input Isolation:
          1500 V AC
        • User Output Continuous Current:
          1 A
        • User Output Make Current:
          10 A
        • User Output Break Current:
          1 A
        • User Output Minimum ON Current:
          25 mA
        • User Output Leakage Current:
          2 mA
        • Start Ramp Setting:
          0.5 to 60 s
        • Stop Ramp Setting:
          0.5 to 60 s
        • Initial Voltage Setting:
          30 to 80%
        • Weight:
          0.7385 lbs (0.335 kg)
        • Estimated shipping dimensions:
          23.1x5.5x16.5cm
        • Tariff Code:
          85389091
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals RUN Input Ramp Controls Status Outputs Setup Checks

        Features:

        • The 230 V RUN circuit starts the programmed soft-start sequence.
        • Ramp and initial-voltage controls define how the 3RW34 power section changes motor voltage.
        • Status LEDs and an isolated user output separate local indication from external reporting.
        A valid RUN input is evaluated before the selected start ramp is applied.

        Stop behavior depends on the selected ramp and wiring arrangement rather than the command alone.

        Fault and delay switches coordinate controller response with the connected starter circuit.

        The Siemens 3RW3950-6DC48 SIKOSTART 3RW34 Control Section may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 3RW3950-6DC48 SIKOSTART 3RW34 Control Section Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Separating a valid start command from the inactive state

        • Command source: The external control circuit applies the 230 V AC RUN signal.
        • ON threshold: Voltage and current must exceed the documented minimum values.
        • OFF threshold: Residual voltage and current must stay below the documented limits.
        • Isolation: The control input remains electrically separated from the user output circuit.

        Coordinating voltage buildup and motor acceleration

        • Initial voltage: The starting point is set before the ramp begins.
        • Start time: The selected interval controls how long the voltage rise takes.
        • Stop time: The stopping ramp governs the commanded voltage reduction.
        • Motor response: Load torque and motor current are checked against the chosen settings.

        Relating local indicators to external controller status

        • LED 1: Ready, phase-loss and EEPROM conditions share the first indication path.
        • LED 2: Full-voltage, start-stop and shorted-SCR states use the second path.
        • User output: The isolated output transfers its assigned condition to external monitoring.
        • Circuit limit: Make, break and continuous current ratings apply to the connected load.

        Restoring the complete starter configuration after service

        • Control voltage: The replacement section must match the 230 V AC control circuit.
        • Wiring mode: Switch selection must agree with the actual 3RW34 connection.
        • Fault behavior: The stored fault choice is compared with plant interlock requirements.
        • Functional test: RUN, ramp, full-voltage and stop states are observed in sequence.
        Description
        Siemens 3RW3950-6DC48 is the 230 V AC control section for the SIKOSTART 3RW34 soft-starter system. It receives the RUN command, shapes the start and stop sequence, and supervises the controller states used to bring a connected motor onto or away from the supply.

        A RUN signal enters 3RW3950-6DC48 through the documented 230 V input circuit, where its voltage and current thresholds separate a valid command from the OFF state. The control section then applies the selected starting ramp and initial-voltage settings to the power section rather than switching the motor abruptly.

        Front adjustments on 3RW3950-6DC48 coordinate start time, stop time, initial voltage, wiring mode, delay and fault behavior. These settings work together, so changing one parameter without checking the connected motor and the 3RW34 power circuit can alter both acceleration and stopping response.

        Two status indicators on 3RW3950-6DC48 distinguish readiness and supply-related faults from full-voltage, start-stop and shorted-SCR conditions. The isolated user output transfers its assigned status to an external circuit while remaining separate from the RUN input path.
        Alternative Names
        3RW39506DC48 3RW3 950-6DC48 3RW3950 6DC48 Siemens 3RW3950-6DC48 3RW3950-6DC48 Control Section SIKOSTART 3RW3950-6DC48 3RW 3950 6DC48 3RW3950/6DC48
        Technical notes
        Control voltage, ramp settings, initial voltage, fault selection, and the 3RW34 wiring arrangement must match Siemens 3RW3950-6DC48 before startup.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why does Siemens 3RW3950-6DC48 remain inactive when the RUN contact closes?
        Measure the Siemens 3RW3950-6DC48 RUN input against its ON thresholds, then check control voltage, wiring mode, fault indication, and the connected 3RW34 power section.
        Which settings should be recorded before replacing 3RW3950-6DC48?
        Record the 3RW3950-6DC48 start time, stop time, initial voltage, delay, wiring mode, fault selection, terminal wiring, and observed LED states.
        What does a flashing status indication mean on Siemens 3RW3950-6DC48?
        Use the Siemens 3RW3950-6DC48 LED pattern together with the 3RW34 fault table to distinguish supply, phase, EEPROM, start-stop, full-voltage, or SCR conditions.
        Can 3RW3950-6DC48 switch a large external load directly?
        No. The 3RW3950-6DC48 user output must remain within its documented make, break and continuous-current limits; an interposing device is required when the load exceeds them.
        Why can changing the initial voltage affect the start ramp on Siemens 3RW3950-6DC48?
        The Siemens 3RW3950-6DC48 initial-voltage setting defines where the controlled voltage rise begins, so it changes the motor torque available during the programmed ramp.

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