3RW4076-6BB44 SIRIUS Soft Starter Siemens

SIRIUS 3RW4076-6BB44 Soft Starter – Technical Overview & Successor Model

Key Technical Specifications

• Brand & Model: Siemens SIRIUS 3RW4076-6BB44 – soft starter S12 size.
• Rated operational current: 432 A at 40 °C, 385 A at 50 °C, and 335 A at 60 °C.
• Mechanical power output: 250 kW at 400 V (standard circuit, 40 °C) and 132 kW at 230 V.
• Operating voltage range: 200 ... 460 V AC with -15% / +10% tolerance.
• Control supply voltage: 230 V AC at 50/60 Hz (-15% / +10% tolerance).
• Motor overload protection: Adjustable from 207 A up to 432 A, plus intrinsic device protection.
• Adjustable current limitation: Yes, allows precise starting current control.
• Integrated bypass system: Reduces power loss to only 165 W during operation.
• Auxiliary contacts: 2 NO + 1 CO (change-over), screw-type terminals for control circuit.
• Degree of pollution: 3 according to IEC 60947-4-2, insulation voltage rated 600 V.
• Ambient temperature range: -25 °C to +60 °C (operation), derating starts at 40 °C.
• Protection class: IP00, suitable for installation in control cabinets.
• Installation altitude: Up to 5000 m above sea level.
• Environmental category (operation): 3K6 (no ice/condensation), 3C3 (no salt mist), 3S2 (limited sand), 3M6.

Frequently Asked Questions (FAQ)

• Q: What is the direct successor for this soft starter?
  A: Siemens recommends the SIRIUS 3RW5076-6AB14 as the preferred successor type with similar electrical ratings.
• Q: What is the minimum motor current for overload protection?
  A: The adjustable motor current range starts from 207 A up to 432 A – suitable for large motors.
• Q: Does this device support inside-delta (six-wire) connection?
  A: No, the 3RW4076-6BB44 does not support inside-delta circuit. Use standard three-wire connection.
• Q: What is the typical power loss during continuous operation?
  A: At 432 A and 40 °C, the typical power loss equals 165 W due to the integrated bypass system.
• Q: Can I use this soft starter at high altitudes?
  A: Yes, rated up to 5000 m above sea level. Derating may apply above 1000 m – check Siemens guidelines.
• Q: What shipping methods do you provide?
  A: We ship via FedEx, UPS, or DHL. Delivery within 5 business days after order processing.
• Q: What is your return policy?
  A: We support 30 days return from the delivery date for unused items in original packaging.
• Q: Do you have the successor model 3RW5076-6AB14 in stock?
  A: Yes, we also keep the new SIRIUS 3RW5076-6AB14 and other 3RW5 series soft starters in our warehouse.

Contact Information Inquiries: sales@nex-auto.com , +86 153 9242 9628

Partner NexAuto Technology Limited: https://www.nex-auto.com/