3RW4075-6BB34

The SIRIUS 3RW4075-6BB34 is a heavy-duty S12-frame soft starter built for controlled starting and stopping of three-phase AC motors in demanding industrial environments. Rated at 315 A and capable of driving motors up to 250 HP at 460 V (or 125 HP at 230 V), this unit delivers smooth voltage ramp-up that significantly reduces inrush current and mechanical shock to connected drivetrain components. With a main circuit operating range of 200–460 V AC and a 115 V AC control voltage, it integrates cleanly into a wide variety of existing control panel configurations using its screw terminal connections.3RW4075-6BB34

This3RW4075-6BB34 unit has been professionally restored to full operating specification, offering a cost-effective alternative to new stock without sacrificing performance or reliability. The integrated bypass contact system and built-in thyristors work together to ensure efficient power transfer once the motor reaches full speed, reducing thermal stress on the semiconductors during normal run conditions. On-board motor overload protection and adjustable current limitation provide a layered safety net for both the motor and the starter itself, supporting CLASS 10 trip characteristics suited for standard industrial loads such as pumps, fans, compressors, and conveyors.

Designed to operate across an ambient temperature range of -25 °C to 60 °C and dimensioned at approximately 230 mm H × 160 mm W × 278 mm D, part number 3RW4075-6BB34 fits comfortably in standard industrial enclosures and control cabinets. The three-pole, three-phase design carries an insulation voltage rating of 600 V and meets IEC 60947-4-2 pollution degree 3 requirements, confirming its suitability for real-world factory floor conditions where airborne contaminants are present. Whether you are replacing a failed unit or stocking a spare, this remanufactured soft starter represents proven industrial-grade quality at a significant cost savings over a new equivalent.

High Current Rating: Rated at 315 A, this soft starter supports motors up to 250 HP at 460 V, covering a broad range of industrial motor applications.
Bypass Contact System: An integrated bypass contact engages after motor run-up, keeping semiconductors cool and extending the unit’s service life.
Screw Terminal Connection: Robust screw terminals provide a secure, vibration-resistant wiring interface that simplifies installation and long-term maintenance.
Built-In Motor Protection: On-board motor overload protection and adjustable current limitation help prevent costly motor damage from overcurrent events.
Wide Voltage Range: Compatibility with 200–460 V AC main circuits makes this starter suitable for both North American and international industrial voltage standards.