The 3RW4454-6BC44 belongs to the Siemens SIRIUS series. It controls large three-phase motors smoothly. This device limits inrush current and reduces torque spikes. Therefore, your mechanical equipment lasts longer. Many users apply it for pumps, fans, compressors, and conveyors. The built-in thyristors and bridging contactor save panel space. Consequently, you get a compact and efficient starting solution.
The 3RW4454-6BC44 operates at a rated voltage of 200–460V AC. The control supply voltage is 230V AC at 50 or 60 Hz.
For standard circuits at 40°C, the rated current is 615A. This supports a 355kW motor at 400V. At 50°C, the current is 551A. At 60°C, it becomes 489A.
For inside-delta circuits at 40°C, the rated current reaches 1065A. This allows a 630kW motor at 400V. At 50°C, the inside-delta current is 954A. At 60°C, it is 847A.
Furthermore, the adjustable current range starts from 123A. The unit allows 115% continuous overload at 40°C. Typical power loss is only 186W during operation.
This soft starter offers comprehensive motor protection. It includes intrinsic device protection and motor overload protection. Additionally, it supports thermal resistor motor protection. You can reset the device externally. The current limitation is adjustable. Moreover, the inside-delta circuit function is standard.
The 3RW4454-6BC44 also has an outlet for an engine brake. For signaling, it provides three NO contacts and one changeover contact. A display shows fault signals clearly.
The device measures 510 mm wide, 640 mm high, and 290 mm deep. It weighs 28.6 kg. The protection class is IP00, suitable for enclosed panels. Mounting uses screw fixing.
You can rotate the unit ±90° on a vertical mounting plane. Additionally, you can tilt it ±22.5° forward or backward. Maintain these clearances: 100 mm upward, 5 mm sideways, and 75 mm downward. The maximum cable length is 500 meters. Installation altitude can reach 5000 meters above sea level.
Main current circuit connections use busbars. The 3RW4454-6BC44 accepts copper cables from 50 to 240 mm² (finely stranded) or 70 to 240 mm² (stranded). AWG cables from 2/0 to 500 kcmil are also suitable.
Auxiliary and control circuits use screw-type terminals. They accept solid wires of 2x (0.5 to 2.5 mm²). For finely stranded wires with end processing, the range is 2x (0.5 to 1.5 mm²). AWG sizes from 20 to 14 are supported.
The operating temperature range goes up to 60°C. However, derating begins at 40°C. Storage temperature is from -25°C to +80°C. Meanwhile, the operating frequency range is 50 to 60 Hz, with ±10% tolerance.
For installation, ensure proper ventilation. Do not block the cooling paths. Use appropriate cable lugs for main terminals. Tighten all screws to the specified torque. Verify the control voltage matches 230V AC before powering up.
1. What is the difference between standard and inside-delta connection for the 3RW4454-6BC44?
Standard connection uses the full motor current of 615A. Inside-delta connection places the soft starter inside the motor windings, allowing 1065A and 630kW. This reduces line current and enables starting larger motors.
2. Does the 3RW4454-6BC44 need an external bypass contactor?
No. This Siemens model has an integrated bridging contactor. It automatically bypasses the thyristors after starting. Therefore, heat loss is minimal, and you save panel space.
3. What is the minimum motor current this unit can protect?
The adjustable motor overload protection starts at 123A. Below this value, the device may not accurately detect overload conditions. Use a smaller soft starter for very low current motors.
4. Can I use the 3RW4454-6BC44 at high altitudes?
Yes. The unit works up to 5000 meters above sea level. However, above 1000 meters, you may need to derate the current. Check the Siemens manual for exact derating factors.
5. Which shipping carriers do you use for this soft starter?
We use FedEx, UPS, and DHL for all shipments. Each order includes full tracking insurance and expedited handling. Delivery typically takes 3 to 7 business days worldwide.
| Brand Name | Siemens |
| Model No. | 3RW4454-6BC44 |
| Product Type | Soft Starter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
