3RW4424-1BC45

This soft starter uses screw-type terminals, with a standard 47A connection and a delta connection of 81A, and can handle a wide voltage range of 400 to 600V. It features a built-in bypass contact to reduce operating heat, making it suitable for smooth start-stop control of small and medium-sized three-phase motors.

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Siemens 3RW4424-1BC45 SIRIUS soft starter product image

Product Positioning

The 3RW4424-1BC45 is a Siemens SIRIUS 3RW44 miniature frame soft starter that provides stepless voltage ramp start and stop for three-phase asynchronous motors using thyristor phase control. It is suitable for applications with voltage levels from 400 to 600V.

Core Product Advantages and Features

Wide voltage compatibility design

It can operate within a voltage range of 400 to 600V AC, covering a variety of field power supply specifications, reducing the complexity of selection.

Built-in bypass connection

After startup, it automatically switches to bypass contact conduction, reducing continuous heating of the thyristor and extending its service life.

Adjustable current limiting startup

Adjust the starting current limit value according to the motor load characteristics to avoid the instantaneous current impact on the power distribution system during startup.

Delta connection increases capacity

It supports inside-delta wiring, allowing for the driving of higher-power motors with a smaller frame.

project	Specification
model	3RW4424-1BC45
Product Category	SIRIUS 3RW44 Miniature Three-Phase Soft Starter
Rated current (standard wiring, 40°C)	47 A
Rated current (delta connection, 40°C)	81 A
Rated power (400V, standard wiring)	22 kW
Rated power (500V, standard wiring)	30 kW
Rated voltage range	400~600 V AC (-15%/+10%)
Control voltage	AC 230 V (50/60 Hz)
Enclosure protection rating	IP00, front touch protection up to IP20
Main circuit terminals	Crimp terminal (box terminal)
Control circuit wiring terminals	Screw terminals
External dimensions (width x height x depth)	170 x 192 x 270 mm
Applicable frequency	50/60 Hz
Motor overload protection	Class 10 standard startup features

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3RW4424-1BC35

Standard wiring 42A, delta wiring 73A, using 115V AC control voltage, compatible with a wide voltage range of 400 to 600V and US standard 575V motor power rating, suitable for the smooth starting requirements of three-phase motors in production lines that meet both North American and European standards.

3RW4424-1BC34

This model has a rated current of 42A with standard wiring and 73A with delta wiring. It can drive a 25hp motor at 460V. It features screw-type terminals and IP20 front panel protection and belongs to the Siemens SIRIUS 3RW44 series of standard 200 to 460V models.