3RW4038-1BB04

The SIRIUS 3RW40 series S2 frame-mounted simplified soft starter has a rated current of 72A and is compatible with 37kW/400V three-phase asynchronous motors. It features screw terminal wiring, a 24V AC/DC control power supply, and a built-in bypass contactor to reduce operating losses. It is suitable for the smooth starting of loads such as pumps and fans.

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Siemens 3RW4038-1BB04 soft starter physical appearance image

Product Positioning

The 3RW4038-1BB04 is a 72A rated current S2 frame soft starter in the SIRIUS 3RW40 series. It is designed for 37kW/400V three-phase motors and can effectively reduce starting current surges and extend mechanical life.

Core Product Advantages and Features

Built-in bypass connection

After reaching the rated speed, it automatically switches to bypass mode to reduce body heat and improve system efficiency.

Adjustable current limit

Adjust the upper limit of the starting current according to the motor load characteristics to avoid instantaneous overload of the power supply system.

Two-phase control architecture

By controlling only the conduction angle of two phases and allowing the third phase to conduct directly, the circuit design is simplified and the cost is lower.

Fault can be reset remotely

After disconnecting, it can be reconnected via an external signal, reducing the time required for personnel to operate on-site.

project	Specification
Product Series	SIRIUS 3RW40 Simplified Soft Starter
Base size	S2
Rated operating current Ie	72 A
Corresponding motor power (400V)	37 kW
Rated operating voltage Ue	200...480 V AC
Control power supply voltage	24 V AC/DC
Terminal block type	Screw terminals
Motor protection methods	Standard type (excluding thermal resistor input)
Control method	Two-phase control, third-phase direct connection
Break away from level	Class 10
Built-in functions	Bypass contactor, adjustable current limit, remote fault reset
Applicable ambient temperature	-25°C to +60°C (reduction in usage is required above 40°C)
Applicable occasions	Soft starter for three-phase asynchronous motors such as pumps, fans, and conveyor belts

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The 3RW4038-1BB14 is a Siemens SIRIUS 3RW40 series S2 housing soft starter with a rated operating voltage of 200 to 480V, a rated current of 62A at 50°C, and a capacity of 40HP at 460V. The control power supply voltage covers 110 to 230V AC/DC, eliminating the need for a separate control transformer.

3RW4037-2TB04

SIRIUS 3RW40 series S2 frame soft starter, rated current 63A, corresponding to 30kW/400V (18.5kW/230V) three-phase motor, spring terminal wiring with built-in thermal resistor input, 24V AC/DC control power supply, IP20 protection rating.

3RW4037-1TB04

The SIRIUS 3RW40 series S2 frame soft starter has a rated current of 63A, is compatible with 30kW/400V three-phase motors, features screw terminal wiring and supports thermal resistor (PTC) input, a 24V AC/DC control power supply, and can monitor motor temperature rise.