3RW4055-6BB44

The 3RW4055-6BB44 is a Siemens SIRIUS simplified soft starter that uses voltage ramp control to reduce motor starting surge current, thereby reducing the impact on the power supply system and mechanical structure. It has built-in bypass contacts and overload protection functions and is suitable for the starting needs of general small and medium-sized industrial motors.

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Siemens 3RW4055-6BB44 Simplified Soft Starter

Product Positioning

The 3RW4055-6BB44 belongs to the Siemens SIRIUS 3RW40 series soft starter. It reduces the starting surge current of the motor by using a voltage ramp method and is suitable for starting control of small and medium-sized industrial motors.

Core Product Advantages and Features

Thyristor phase control start

By adjusting the power supply voltage through phase angle, the motor can accelerate smoothly from a standstill, reducing starting shock.

Bypass contact design

After full-speed operation, the built-in bypass contact takes over the power supply, reducing the losses caused by thyristor conduction.

Overload protection function

It has a built-in motor thermal overload protection mechanism to help monitor the motor's operating status.

Startup settings flexibility

The start-up ramp time and current limit value can be adjusted and set according to the motor and load conditions.

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project	Specification
brand	Siemens
Product Series	SIRIUS 3RW40 series
model	3RW4055-6BB44
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

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