3RW4443-6BC35

The Siemens 3RW4443-6BC35 soft starter has a rated voltage of 400-600V AC, a standard wiring rating of 180A, and an internal delta wiring rating of 312A. It features a bypass contactor and motor overload protection, and is suitable for smooth start-stop of loads such as pumps and fans.

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Siemens 3RW4443-6BC35 soft starter physical appearance image

Product Positioning

The SIRIUS 3RW4443-6BC35 is a soft starter in the Siemens 3RW44 series suitable for voltage levels of 400-600V. It reduces the inrush current at the moment of motor start-up through voltage ramp control, thereby reducing the impact on the power grid and mechanical transmission system.

Core Product Advantages and Features

Bypass contactor built-in

After startup, the bypass contact automatically replaces the thyristor conduction, reducing power loss and heat generation during operation.

Internal delta wiring to expand capacity

It supports inside-delta wiring, significantly increasing the controllable motor power within the same form factor.

Adjustable start-stop curves

It offers multiple starting modes, including start-up surge, torque control, and voltage ramp, and can be set to ramp deceleration or pump mode stop.

Integrated motor protection

Built-in thermistor overload protection and thermistor evaluation function eliminates the need for additional overload relays.

project	Specification
model	3RW4443-6BC35
Rated operating voltage	400 ... 600 V AC
Standard wiring rated current (50°C)	180 A
Rated current (50°C) for internal delta connection	312 A
Control power supply voltage	115 V AC, 50/60 Hz
Motor power (575V, standard wiring)	150 hp
Motor power (575V, internal delta connection)	300 hp
Motor power (460V, standard wiring)	125 hp
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
Applicable Standards	IEC 60947-4-2

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