3RW4056-6BB45

The 3RW4056-6BB45 is a Siemens SIRIUS simplified soft starter. It reduces the instantaneous starting current of the motor through voltage ramp control, has built-in bypass contacts to reduce heat generation and energy consumption during full-speed operation, and has motor thermal overload protection. It is suitable for starting control of medium-sized three-phase induction motors.

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Siemens 3RW4056-6BB45 Simplified Soft Starter

Product Positioning

The 3RW4056-6BB45 belongs to the Siemens SIRIUS 3RW40 series soft starter. In this series, its capacity is between that of the 3RW4055 and 3RW4073, and it is suitable for the starting control needs of medium-sized three-phase motors.

Core Product Advantages and Features

Voltage ramp start/stop

The use of thyristor phase control makes the motor start-up and stop process smoother and reduces surge current.

Built-in bypass contact

When the motor is running at full speed, the bypass contact takes over the power supply, which helps to reduce the heat generated during long-term conduction.

Motor thermal overload protection

Built-in overload protection function can provide protection when the motor is running abnormally, reducing the risk of burnout.

Flexible adjustment of startup parameters

The start-up ramp time and current limit value can be adjusted according to site requirements to adapt to different load characteristics.

project	Specification
brand	Siemens
Product Series	SIRIUS 3RW40 series
model	3RW4056-6BB45
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).

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3RW4056-6BB44

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