75 kW Soft Starter 3RW4435-6BC44 | Siemens SIRIUS Series

Product Description

Product Overview

The Siemens 3RW4435-6BC44 is a SIRIUS soft starter designed for standard three-phase motor starting applications.
It enables smooth acceleration and deceleration, therefore reducing mechanical stress and electrical peak currents.
Moreover, this model supports both inline and inside-delta connections for flexible system design.
Although now phased out, it remains widely installed across industrial plants worldwide.

Technical Specifications

• Manufacturer: Siemens AG

• Series: SIRIUS Soft Starter

• Model: 3RW4435-6BC44

• Product Type: Soft starter for standard applications

• Product Lifecycle: Discontinued product

• Preferred Successor: SIRIUS 3RW5 series, model 3RW5535-6HA14

• Rated Operating Voltage: 200–460 V AC, three-phase

• Control Supply Voltage: 230 V AC

• Rated Frequency: 50 / 60 Hz

Performance Values at 400 V, 40 °C (Standard Circuit):

• Rated Current: 134 A

• Rated Motor Power: 75 kW

Inside-Delta Operation:

• Rated Current: 232 A

• Rated Motor Power: 132 kW

• Connection Type: Screw terminals

• Utilization Category: AC-53b (IEC 60947-4-2)

• Mounting Method: Panel mounting

• Protection Class: IP20 (open type, enclosure required)

• Operating Temperature Range: –25 °C to +40 °C (derating above rated conditions)

• Compliance: IEC standards, RoHS compliant

• Dimensions (L × W × H): 390 × 318 × 338 mm

• Net Weight: 7.9 kg

• Country of Origin: Germany

FAQ

Q1: Is the Siemens 3RW4435-6BC44 still manufactured?
No, this model is discontinued and replaced by the SIRIUS 3RW5 series.

Q2: What is the recommended replacement model?
The preferred successor is Siemens 3RW5535-6HA14 from the SIRIUS 3RW5 family.

Q3: What motor power does this soft starter support?
It supports 75 kW in standard connection and up to 132 kW in inside-delta configuration.

Q4: Does this unit support inside-delta wiring?
Yes, it supports inside-delta operation for higher power motors with reduced current.

Q5: Is enclosure protection required?
Yes, the IP20 design requires installation inside a suitable control cabinet.