3RW4055-6BB45

The Siemens SIRIUS 3RW4055 soft starter uses thyristor phase control to achieve voltage ramp start and stop, and is suitable for small and medium-sized three-phase induction motors. It has built-in bypass contacts to reduce operating heat and has motor thermal overload protection. It is commonly used in general industrial applications such as pumps and fans.

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Siemens SIRIUS 3RW4055-6BB45 Soft Starter

Product Positioning

The 3RW4055-6BB45 is a relatively small capacity soft starter model in the Siemens SIRIUS 3RW40 series, suitable for the starting control needs of small and medium-sized three-phase induction motors.

Core Product Advantages and Features

Voltage ramp start control

The use of thyristor phase control enables smooth starting of small and medium-sized three-phase motors and reduces surge current.

Built-in bypass contact

When operating at full speed, power is supplied by the bypass contact, which helps reduce the heat generated by the thyristor during continuous conduction.

Motor thermal overload protection

Built-in motor overload protection function can provide protection to reduce risks when abnormal operation occurs.

Startup parameters can be adjusted

The start-up ramp time and current limit value can be flexibly adjusted according to the characteristics of the motor on site.

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project	Specification
brand	Siemens
Product Series	SIRIUS 3RW40 series
model	3RW4055-6BB45
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).
Manufacturer

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