3RW4443-6BC34

The Siemens 3RW4443-6BC34 soft starter has a rated voltage of 200-460V AC, a standard wiring rating of 180A, and an internal delta wiring rating of 312A. It features a bypass contactor and overload protection design, making it suitable for reduced-voltage starting applications such as conveyor belts and compressors.

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Siemens 3RW4443-6BC34 soft starter physical appearance image

Product Positioning

The SIRIUS 3RW4443-6BC34 is a soft starter in the Siemens 3RW44 series with a voltage rating of 200-460V. It replaces direct starting with electronic voltage ramping, effectively extending the service life of motors and transmission mechanisms.

Core Product Advantages and Features

Voltage ramp start

Adjustable ramp voltage replaces instantaneous full-voltage start-up, reducing mechanical shock and current surge during startup.

Bypass contactor design

Once the operation is stable, it automatically switches to bypass contact conduction to reduce continuous heating and energy loss of the thyristor.

Internal delta wiring option

The wiring method can be switched between standard or internal delta connection, allowing for greater motor power within a limited volume.

Graphical operation panel

It features a backlit multi-line text display and a four-button operation interface, making it convenient for on-site personnel to quickly set parameters.

project	Specification
model	3RW4443-6BC34
Rated operating voltage	200 ... 460 V AC
Standard wiring rated current (50°C)	180 A
Standard wiring rated current (40°C)	203 A
Rated current (50°C) for internal delta connection	312 A
Control power supply voltage	115 V AC, 50/60 Hz
Motor power (460V, 50°C standard wiring)	125 hp
Motor power (460V, 50°C internal delta connection)	250 hp
Motor power (400V, 40°C standard wiring)	110 kW
Main circuit wiring method	busbar connection
Control circuit terminals	Screw terminals
Enclosure protection rating	IP00, IP20 after covering
External dimensions (width x height x depth)	210 x 230 x 298 mm

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