Siemens 3RW4026-1TB04: SIRIUS 3RW40 High-Performance Soft Starter
The Siemens 3RW4026-1TB04 is a high-efficiency soft starter from the SIRIUS 3RW40 series, specifically designed for the smooth starting and stopping of three-phase asynchronous motors. By reducing the starting current and preventing torque peaks, this device protects mechanical components from excessive stress and minimizes voltage dips in the supply network. Its compact Size S0 design makes it an ideal choice for space-constrained control cabinets in demanding industrial applications.
This unit features integrated functions such as electronic motor overload protection and intrinsic device protection, making it a robust alternative to conventional star-delta starters. The 3RW4026-1TB04 is engineered for 2-phase control, ensuring reliable operation for motors in conveyors, compressors, and pump systems.
Technical Specifications and Performance Data
According to the official Siemens manufacturer data sheets, the 3RW4026-1TB04 includes the following technical characteristics:
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Rated Operating Current (at 400V): 25 Amps (25A).
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Power Rating (at 400V): 11 kW for standard three-phase induction motors.
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Control Supply Voltage: 24V AC/DC, providing versatile integration with industrial control circuits.
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Integrated Bypass: Features a built-in bypass contact system to reduce heat dissipation and energy consumption during continuous operation.
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Protection Features: Integrated electronic motor overload protection and thermistor motor protection.
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Size: S0 (45mm width), optimized for high-density DIN rail or screw mounting.
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Connection Type: Robust screw-type terminals for secure electrical contact.
Industrial Advantages and System Reliability
The 3RW4026-1TB04 offers strategic benefits for the reliability of high-tier automation hardware:
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Mechanical Protection: Provides adjustable soft start and soft stop times (0 to 20 seconds), significantly reducing wear on belts, gears, and bearings.
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Energy Efficiency: The integrated bypass system allows for a compact design and minimizes the thermal load in the control cabinet after the motor has reached full speed.
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Advanced Monitoring: Equipped with LED indicators for «Device OK,» «State/Fault,» and «Overload,» allowing for rapid visual diagnostics of the motor starter’s status.
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Global Compliance: Fully certified to international standards (CE, UL, CSA), facilitating the use of this component in machinery destined for global export.
