Siemens 3RW4056-6BB44 SIRIUS Soft Starter

Description

The 3RW4056-6BB44 is a SIRIUS electronic soft starter designed to facilitate the smooth starting and stopping of three-phase induction motors. By providing a controlled voltage ramp, this unit reduces mechanical stress on the drive train and limits high inrush currents during startup, thereby extending the lifespan of motors, belts, and gearboxes. Rated for 162 A and 90 kW at 400 V, this device is intended for industrial applications where motor protection and controlled acceleration are critical. Please note that this product has been phased out, and the recommended functional successor is the SIRIUS 3RW5056-6AB14.

Features

• Motor Control: Provides soft start and soft stop to minimize mechanical shock.
• Capacity: Rated operational current of 162 A; 90 kW at 400 V.
• Operational Voltage: 200–460 V AC.
• Control Voltage: 230 V AC.
• Connections: Rugged screw terminals for secure electrical termination.
• Successor: Compatible with the SIRIUS 3RW5 series (Type: 3RW5056-6AB14).

Applications

• Conveyor systems and transport equipment.
• Pumps and compressor control.
• Industrial fans and blowers.
• Centrifuges and agitators.
• HVAC system motors.

Technical Specifications

Installation Guidelines

• Mounting: Mount the soft starter vertically in a control cabinet with adequate space above and below for cooling airflow.
• Ventilation: Ensure the ambient temperature does not exceed 40 degC; provide forced ventilation if the enclosure heat dissipation is insufficient.
• Wiring: Use appropriately sized power cables for 162 A operation. Tighten all screw terminals to the torque specifications provided in the original manual to prevent overheating.
• Protection: The device is rated IP00; ensure it is installed within a properly rated electrical enclosure to provide protection against touch and environmental ingress.
• Grounding: Connect the device chassis to a common protective earth (PE) busbar to ensure electromagnetic compatibility and operator safety.