3RW4426-1BC44 Siemens Soft Starter 77A 37kW Motor Control

SIRIUS 3RW4426-1BC44 Soft Starter – High-Feature Motor Control

• Rated operational current (standard circuit, 40 °C): 77 A – suitable for 37 kW motors at 400 V.
• Inside-delta circuit performance (40 °C): 133 A, enabling 75 kW output at 400 V.
• Operating voltage range: 200 … 460 V AC with ±15% negative and +10% positive tolerance.
• Control supply voltage: 230 V AC at 50/60 Hz, tolerance –15% / +10%.
• Adjustable motor protection current: 15 A minimum, with continuous duty rating of 115% of I_e at 40 °C.
• Power loss at rated current: only 45 W typical, ensuring energy-efficient operation.

Mechanical Design and Installation

• Dimensions (W x H x D): 170 mm x 192 mm x 270 mm – compact for panel mounting.
• Mounting position: vertical ±90° rotation, tilt ±22.5° forward/backward for flexible installation.
• Required clearances: 100 mm upward, 75 mm downward, 5 mm sideward to adjacent devices.
• Maximum cable length: 500 m – suitable for distributed motor installations.
• Altitude rating: up to 5,000 m above sea level without derating.
• Protection class: IP00 (open type) for use in control cabinets.

Electrical Connections and Terminals

• Main circuit terminals: box-type screw terminals, accepting solid (2.5–16 mm²) or stranded (up to 70 mm²) conductors.
• Auxiliary contacts: 3 NO + 1 changeover, screw-type terminals for 2x (0.5–2.5 mm²) solid or 2x (0.5–1.5 mm²) fine-stranded wires.
• AWG compatibility: main terminals accept 10 … 2/0 AWG, auxiliary terminals accept 20 … 14 AWG.
• Integrated features: thyristor control, bridging contactor, and motor brake output for complete application coverage.

Environmental and Operational Conditions

• Ambient operating temperature: up to 60 °C – derate current above 40 °C as per datasheet.
• Storage temperature: –25 °C to +80 °C for rugged durability.
• Frequency tolerance: 50/60 Hz nominal with ±10% variation allowed.
• Minimum load: 8% of motor rated current for stable operation.

UL/CSA Ratings and Application Support

• Standard circuit horsepower (230 V / 50 °C): 20 hp; at 460 V: 50 hp.
• Inside-delta circuit horsepower (230 V): 40 hp; at 460 V: 75 hp – ideal for high-torque starts.
• Auxiliary contact rating (UL): B300 / R300 for reliable control signaling.
• Product includes: 3RW4426-1BC44 soft starter, screw terminals, and integrated protection functions.

Frequently Asked Questions (FAQ)

• Is the 3RW4426-1BC44 brand new? Yes, we supply only brand-new, original Siemens SIRIUS units with full factory specs.
• Do you have this model in stock? Yes, we maintain stock for the 3RW4426-1BC44 – ready for fast shipment.
• What is the delivery lead time? We dispatch within 5 working days after order confirmation.
• Which shipping carriers do you use? We ship via DHL, FedEx, or UPS – reliable global logistics.
• Can I return the product if it doesn't fit my application? We support 30-day returns for unused items in original packaging.
• Does this starter support external reset? Yes, the 3RW4426-1BC44 provides external reset function for remote troubleshooting.
• What is the maximum conductor size for main terminals? It accepts up to 70 mm² stranded or 2/0 AWG for high-current connections.

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

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