3RW4075-6BB44

The 3RW4075-6BB44 has a rated current of 356A, corresponding to a voltage range of 200 to 460V AC and a control power supply of 230V AC. It has a built-in thyristor bypass system and motor overload protection, making it more energy-efficient and safer to operate.

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Siemens 3RW4075-6BB44 SIRIUS 3RW40 soft starter appearance diagram

Product Positioning

The 3RW4075-6BB44 is a 356A model in the Siemens SIRIUS 3RW40 series, suitable for 200 to 460V AC three-phase motors. It reduces the impact on the power grid during startup by using a voltage ramping method.

Core Product Advantages and Features

356A rated current

It corresponds to a 200kW motor power under 400V voltage, suitable for medium and large pump and fan loads.

Built-in overload protection

It integrates motor overload protection, which can immediately protect the motor and circuit safety in case of abnormal current.

Bypass contact saves power

Upon startup, the system automatically switches to bypass operation, reducing heat loss caused by long-term thyristor conduction.

Screw terminals are secure

The auxiliary and control circuits use screw terminals, which maintain stable contact even under long-term vibration.

project	Specification
Rated current (40°C)	356 A
Rated current (50°C)	315 A
Rated current (60°C)	280 A
Main circuit voltage range	200–460V AC
Control power supply voltage	230V AC (50/60Hz)
Rated power (230V)	110 kW
Rated power (400V)	200 kW
Enclosure protection rating	IP00 (IP20 after capping)
Chassis dimensions (width × height × depth)	160×230×278mm
net weight	Approximately 9.0 kg
Terminal type	Screw terminals (auxiliary/control circuit)
Installation method	Screw fixing
Casing Specifications	S12

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3RW4076-2BB44

The 3RW4076-2BB44 and 6BB44 have the same electrical specifications. The difference is that the auxiliary and control circuits use spring terminals instead of screws for fastening. The wires are quickly clamped and not easy to loosen, making them suitable for production line distribution panels that require frequent maintenance.

3RW4075-6BB35

The 3RW4075-6BB35 is designed for 400 to 600V AC high-voltage main circuits, paired with a 115V AC control power supply. It is commonly used in US standard panel wiring and has a rated current of 356A, which can support the smooth start of medium and large three-phase motors.

3RW4074-6BB44

The 3RW4074-6BB44 has a rated current of 280A and is compatible with 200 to 460V AC and 230V AC control power supplies. It features an S12 chassis with screw terminal wiring, smooth start-up, and bypass power saving and overload protection mechanisms.