Nowadays, three-phase motors represent the most favored type of drive concept. Direct starting or star-delta starting is, in many cases, not the best solution. Such methods often result in unpleasant side-effects such as mechanical impacts inside the machine or voltage dips in the power supply system.

Our new SIRIUS family of soft starters is a comprehensive range of products covering all the standard and high-feature motor-starting applications. The advantages of soft start-up and smooth ramp-down with these devices can therefore be exploited in the most varied of applications for simple and economically efficient machinery and equipment layouts.

3RW40 SIRIUS Soft Starter, for Standard Applications

SIRIUS 3RW40 is the star among our standard soft starters. Thanks to its innovative control method, it is not just the only 2-phase-controlled soft starter in the world for use in the power range up to 250 kW (at 400V) – respectively 400 hp (at 575V) – because of its especially compact design, it ensures a space-saving, clear layout in the control cabinet. It is therefore more than a mere functionally expanded addition to our 2-phase-controlled series of SIRIUS 3RW30/31 soft starters.

The new 3RW40 soft starters in the lower HP range from 10 - 75 HP (at 575 V) in sizes S0 to S3 expand the performance spectrum of the 3RW40 soft starters. They represent the compact and price-attractive alternative to start-delta starters.

Potentiometers on the front of the unit provide settings for current limit, starting voltage, and starting and stopping times of the voltage ramp.

Features :

Frame sizes S0, S2 & S3 can handle up to 100 Amps (75 HP @ 575 VAC)
Frame sizes S6 & S12 can handle up to 385 Amps (400 HP @ 575 VAC)
Selectable Current Limiting
Built in Overload Protection
Compact ......only half the size of a comparable star-delta starter
From the SIRIUS 3R modular system, combinable with SIRIUS contactors, circuit-breakers and overload relays
Soft startup and run down with voltage ramp
Setting through potentiometer
Manufacturing program includes single-phase motors
Communication-capable over AS-Interface bus in size S00
Simple installation and startup
Integrated bypass contact for minimizing power loss
Two integrated auxiliary contacts in sizes S0, S2 and S3 ensure convenient control
Two control voltage versions UC 24V and UC 110V to 230V
Operating voltage from 200V to 575V at 50/60 Hz
Operating temperature range from -25°C to +60°C

3rw40_s023_400

S0 S2 S3

S6 S12

3RW44 SIRIUS Soft Starter, with High Features

SIRIUS 3RW44 soft starters make soft starting and stopping Soft Starters attractive for difficult starting applications and combine a high degree of functionality, simplified operational settings, and extensive diagnostics. SIRIUS 3RW44 soft starters are available for operating current up to 748 amps at 40º C, and can be equipped with a Profibus DP communication option.
Features are the same as 3RW40 including:
Rated Operating Currents up to 748 Amps (750 HP @ 575 VAC)
Closed Loop Torque Control
Starting / Stopping Torque adjustable from 20...100%
Torque Limiting adjustable from 20...100%
Ramp Time, 1...360 seconds
Inside-Delta Circuit Configuration
Breakaway Pulse
Crawl In Both Directions
Pump Stopping
Combined DC-Braking Function
Motor Heating
Built-In Operator Display
Measured Operating Values
Fault Logbook
Event List
Externally Mounted Operator Display (Optional)
Programmable Inputs & Outputs
Communication with PROFIBUS-DP (Optional)