3RW4434-6BC44 113A Soft Starter 200-460V AC

Key Features and Technical Specifications

The 3RW4434-6BC44 stands out with its robust feature set:

• Rated operating current: 113 A at 40 °C (100 A at 50 °C, 88 A at 60 °C)
• Emitted mechanical power: 55 kW at 400 V standard circuit, 110 kW at 400 V inside-delta circuit
• Operating voltage: 200-460 V AC (standard and inside-delta circuits)
• Control supply voltage: 230 V AC (50/60 Hz)
• Adjustable rated current for motor overload protection: 22 A minimum
• Integrated device protection and motor overload protection
• Evaluation of thermal resistor motor protection
• External reset capability
• Adjustable current limitation
• Inside-delta circuit support
• Integrated bridging contact system and thyristors
• Product component for motor brake
• Active power loss: 64 W typical at 40 °C
• Operating frequency: 50-60 Hz (±10%)
• Minimum load: 8% of I_M
• Continuous operating current: 115% of I_e at 40 °C
• Protection class: IP00
• Mounting: screw fixing, rotatable ±90° on vertical mounting plane
• Dimensions: 170 mm width, 200 mm height, 270 mm depth
• Weight: not specified

The 3RW4434-6BC44 offers a unique advantage: its inside-delta circuit capability allows higher power ratings (110 kW) while maintaining compact dimensions. This feature is ideal for applications requiring high starting torque with limited space.

Applications and Use Cases

In industrial settings, the 3RW4434-6BC44 excels in controlling three-phase squirrel-cage motors. It is well-suited for pumps, fans, compressors, and conveyor systems where controlled acceleration reduces mechanical stress. The adjustable current limitation helps prevent voltage dips and protects the motor from excessive starting currents.

Furthermore, the inside-delta circuit configuration enables the soft starter to handle larger motors (up to 110 kW) without increasing the physical footprint. This makes it a preferred choice for retrofitting existing motor control panels where space is at a premium.

Installation and Setup

Mounting the 3RW4434-6BC44 is straightforward with screw fixing. The device can be rotated ±90° on a vertical mounting plane, and tilted ±22.5° forward and backward, offering flexibility in panel layout. Maintain the following clearances to adjacent components: 100 mm upwards, 5 mm sidewards, and 75 mm downwards.

Electrical connections use busbar connections for the main circuit and screw-type terminals for auxiliary and control circuits. The main circuit accepts conductor cross-sections from 16 to 70 mm² (stranded or finely stranded), and AWG sizes from 6 to 2/0. For auxiliary contacts, solid conductors up to 2x 2.5 mm² are supported. Ensure proper torque settings per the manufacturer's instructions.

Maintenance and Reliability

Regular inspection of the 3RW4434-6BC44 ensures long-term reliability. Check the device for dust accumulation and verify all terminal connections are tight. The integrated overload protection reduces the risk of motor burnout, minimizing downtime. The device is designed for an ambient operating temperature up to 60 °C, with derating above 40 °C.

Because the soft starter includes thyristors and a bridging contact system, periodic verification of these components is recommended. Follow the manufacturer's maintenance guidelines to maintain optimal performance.

Compatibility and Integration

The 3RW4434-6BC44 is part of the Siemens SIRIUS family, ensuring compatibility with a wide range of industrial control systems. It supports external reset and provides three NO contacts and one changeover contact for auxiliary signaling. The device integrates seamlessly with motor control centers and PLC-based systems.

Troubleshooting and Common Issues

If the soft starter fails to start, check the control supply voltage (230 V AC) and the operating voltage (200-460 V AC). Verify that the motor overload protection setting is correctly adjusted above the minimum of 22 A. If the device trips frequently, inspect the motor for mechanical jams or excessive load.

For fault indication, the device provides a display. Refer to the manual for specific fault codes. Ensure the ambient temperature does not exceed the rated limits to avoid nuisance trips.

Product Support and Availability

The Siemens 3RW4434-6BC44 is available from AutoDCSTech. Contact our team for current stock and delivery options. We provide genuine industrial automation components with reliable support.