3RW4073-6BB44

The SIRIUS 3RW4073-6BB44 is a simplified soft starter from Siemens that uses voltage ramp control to smoothly start three-phase motors, reducing the impact of starting surge current on the power supply system. It has built-in bypass contacts and overload protection and is suitable for general industrial motor loads such as pumps, fans, conveyors, and compressors.

Share To

Siemens 3RW4073-6BB44 Simplified Soft Starter Product Appearance Image

Product Positioning

The 3RW4073-6BB44 is a simplified soft starter in the Siemens SIRIUS 3RW40 series. It controls the starting and stopping of a three-phase motor using a voltage ramp method, helping to reduce the current surge during startup. This series belongs to the higher capacity class within its model family and is suitable for applications requiring high smoothness of startup.

Core Product Advantages and Features

Voltage ramp start control

The output voltage is adjusted by using thyristor phase angle control, which enables the motor to accelerate smoothly from a standstill to the rated speed and reduces the current surge at startup.

Built-in bypass contact

Once the motor reaches full speed, the built-in bypass contact takes over the power supply, which helps reduce the heat generated by the thyristor's continuous conduction.

Motor overload protection

Built-in electronic motor thermal overload protection function can help reduce the risk of burnout when the motor is operating abnormally.

Startup parameters can be adjusted

The start-up ramp time and current limiting settings can be adjusted according to the characteristics of the motor and load on site, improving start-up flexibility.

project	Specification
brand	Siemens
Product Series	SIRIUS 3RW40 series
model	3RW4073-6BB44
Product Type	Simplified (Basic) Soft Starter
Startup principle	Three-phase thyristor phase angle control, voltage ramp start and stop
Built-in protection	Equipped with motor thermal overload protection function
Built-in bypass	Built-in bypass contacts reduce heat generation and energy loss during full-speed operation.
Adjustable parameters	The ramp start time and flow limit can be adjusted on-site.
Applicable motors	Three-phase AC asynchronous (induction) motor
Applicable Applications	Pumps, fans, conveyors, compressors and other general industrial loads
Mounting terminals	Panel or rail mounting, screw terminal wiring (depending on model).
Manufacturer	Siemens AG (Made in Germany)
Supply Warranty	Kenxin Motors provides Siemens authorized parts and technical consulting support.

Recommend

3RW4073-6BB45

3RW4073-6BB45 is the smallest model in this batch with a rated current of 230A, corresponding to a voltage range of 400 to 600V AC, an insulation voltage of 600V, and complies with IEC 60947-4-2 pollution level 3 standard.

3RW4073-6BB35

The 3RW4073-6BB35 belongs to the SIRIUS series of soft starters. It uses thyristor phase control for voltage ramp-up and shutdown, which helps reduce the current surge during motor startup. It has built-in bypass contacts and thermal overload protection, and is suitable for common three-phase induction motor starting control applications in factories.

3RW4073-6BB34

The Siemens 3RW4073-6BB34 soft starter controls the starting of a three-phase motor using a voltage ramp method, reducing the impact of starting surges on the mechanical and power supply systems. It also has built-in bypass contacts to reduce heat generation during full-speed operation and is equipped with motor overload protection, making it suitable for a variety of industrial automation applications.