3RW4055-6BB34

The 3RW4055-6BB34 is a simplified soft starter in the Siemens SIRIUS 3RW40 series S6 housing. It has a rated operating voltage of 200 to 460V, a rated current of 117A at 50°C, a bus terminal for the main circuit, and a 115V AC control power supply. It features built-in adjustable current-limiting start and overload protection and is suitable for high-current three-phase motor applications.

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Product Positioning

The 3RW4055-6BB34 is a high-current model in the Siemens SIRIUS 3RW40 simplified soft starter series, belonging to the S6 housing class. It has a rated current of 117A (50°C) and the main circuit adopts a bus terminal design, making it suitable for smooth starting and stopping of high-power three-phase motors.

Core Product Advantages and Features

High current carrying capacity

With a rated current of up to 117A at 50°C and up to 134A at 40°C, it is suitable for high-power motor loads.

Busbar main circuit terminals

The main circuit adopts a bolt bus connection method, which facilitates high current wiring and improves the stability of the connection.

Adjustable current limiting startup

The starting current limit can be adjusted according to the characteristics of the motor on site, reducing the impact on the power grid and machinery at the moment of startup.

Built-in motor overload protection

With integrated overload monitoring, motor operation safety can be protected without the need for additional protective components.

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project	Specification
Case size	S6
Rated current (50°C)	117 A
Rated current (40°C)	134 A
Rated current (60°C)	100 A
Rated operating voltage	200...460 V AC
Control power supply voltage	115 V AC, 50/60 Hz
Motor power (230V)	Approximately 37 kW
Motor power (400V)	Approximately 75 kW
UL motor power (460-480V)	75 HP
External dimensions (width x height x depth)	120 x 198 x 250 mm
Installation method	Secured by screws, rotatable ±10° from vertical (fan not included)
Protection level	IP00 (IP20 can be achieved with a protective cover)

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