Siemens 3RW4436-6BC44 Soft Starter 162A 90kW

Siemens 3RW4436-6BC44 SIRIUS Soft Starter for High-Feature Applications

Product Introduction

The 3RW4436-6BC44 belongs to Siemens’ SIRIUS series. It is a soft starter built for demanding motor control tasks. You can use it for standard switching or inside-delta circuits. This model provides 162A at 40°C in standard mode. When wired in inside-delta, it delivers 281A at the same temperature. Such flexibility makes it suitable for pumps, fans, and compressors.

Key Technical Specifications

The 3RW4436-6BC44 offers a rated operating current of 162A at 40°C for standard circuits. For inside-delta circuits, the current reaches 281A at the same temperature. It delivers 90kW at 400V in standard mode. In inside-delta mode, it provides 160kW at 400V. The operating voltage range is 200 to 460V AC. Its control supply voltage is 230V AC at 50 or 60 Hz. You can adjust the motor current from 32A up to 162A. The minimum load is 8% of I_M. Furthermore, the continuous operating current reaches 115% of I_e at 40°C. Typical active power loss during operation is only 95W.

This soft starter includes an integrated bridging contact system and thyristors. It also features motor overload protection and an external reset option. Additionally, the adjustable current limitation gives you better control. The device is ready for inside-delta circuits and includes an output for an engine brake. Another key advantage is its ability to evaluate thermal resistor motor protection. This feature greatly improves motor safety.

Temperature Derating Data

At 50°C, the standard current for the 3RW4436-6BC44 drops to 145A. At 60°C, it becomes 125A. For inside-delta at 50°C, the current is 251A. At 60°C, it is 217A. Therefore, you must consider ambient temperature when you plan the installation. Proper ventilation around the unit helps maintain performance.

Control and Display Features

The control electronics use an AC supply at 230V. Frequency tolerance is ±10%. A built-in display shows fault signals. This helps you identify issues quickly. Moreover, the device supports an external reset. This feature reduces downtime during fault conditions. The control supply voltage tolerances are -15% and +10% at 60 Hz.

Mechanical and Environmental Data

The 3RW4436-6BC44 has a width of 170 mm, a height of 200 mm, and a depth of 270 mm. Mounting is done with screw fixing. You can rotate it ±90° on a vertical plane. You can also tilt it ±22.5° forward and backward. Maintain clearance distances of 100 mm upward, 5 mm sideways, and 75 mm downward. The installation altitude can reach up to 5000 meters above sea level. Maximum cable length is 500 meters. Protection class is IP00. Ambient operating temperature goes up to 60°C. Storage temperature ranges from -25°C to +80°C.

Electrical Connections

For the main current circuit, the 3RW4436-6BC44 uses busbar connections. For auxiliary and control circuits, it uses screw-type terminals. It provides three NO contacts and one changeover contact for auxiliary contacts. There are no NC contacts. Conductor cross-sections for main contacts range from 16 to 70 mm² for stranded or finely stranded wires. For AWG conductors, the range is 6 to 2/0. You can also use DIN cable lugs from 16 to 95 mm² for finely stranded wires. For auxiliary contacts, solid wires from 0.5 to 2.5 mm² are acceptable.

Frequently Asked Questions (FAQ)

1. Can the 3RW4436-6BC44 be used for both standard and inside-delta wiring?
Yes. The 3RW4436-6BC44 supports both standard circuits and inside-delta circuits. In inside-delta mode, it delivers a much higher current of 281A at 40°C.

2. What is the maximum motor power this soft starter can handle?
For a standard circuit at 400V and 40°C, it handles 90kW. For an inside-delta circuit at the same voltage and temperature, it handles 160kW.

3. Does this device include motor overload protection?
Yes. The 3RW4436-6BC44 provides built-in motor overload protection. It also evaluates thermal resistor motor protection for enhanced safety.

4. What clearance spaces are required around the unit?
You must leave 100 mm above, 5 mm on the sides, and 75 mm below the 3RW4436-6BC44. These spaces ensure proper cooling and safe operation.

5. Which shipping carriers do you use for this product?
We ship the 3RW4436-6BC44 via FedEx, UPS, or DHL. The actual carrier depends on your destination and order weight.