Distinctive features of Sirius 3RW40 soft starters
- The built-in bypass contactor minimizes heat losses and ensures a low level of thyristor failure;
- Inrush current /torque limitation function, electronic and thermistor overload protection of the electric motor, hardware protection of the device optimizes the circuit of the switchgear, increases reliability, reduces resources for its creation and maintenance.
- Monitoring the current state of the device and errors displayed on the LEDs of the device allows you to minimize the time of commissioning and troubleshooting of the system.
- Two-phase thyristor control ensures that the minimum operating current is maintained in all three phases, eliminating the negative component of direct current.
- Compliance with the ATEX directive 94/9/EG makes Sirius 3RW40 devices in sizes S0 – S12 suitable for controlling explosion-proof asynchronous electric motors with the degree of protection EEx e (explosion protection type Ex II (2) GD).
Technical characteristics of Siemens Sirius 3RW40 series soft starters
Rated power: 5.5 – 250 kW;
Rated current: 12.5 – 432 A;
Rated operating voltage: 200 - 600V AC;
Voltage supply of electronics: 24 V AC/DC, 110...230 V AC/DC, 115 V AC, 230 V AC;
Acceleration/stop voltage level: 40...100%;
Acceleration and run-out time: 0...20s;
Power thyristor control: 2-phase;
Temperature range: -25...+60°C;
Degree of protection: IP00.
Built-in controls, visualizations, terminals and options
Bypass/shunt contactor built into the device housing;
Input terminals of the control voltage Uc;
Built-in control potentiometers 6 pcs. (U – "Initial voltage level", t – "Acceleration time", Ie – "Motor current", xIe – "Current limitation value", t – "Stop time", CLASS – "Actuation class – maximum time of disconnection of the protective device");
2 reset control buttons (RESET MODE – "reset execution mode": Auto=yellow, Remote=green, Manual=off; RESET /TEST – "Manual reset" /"Motor protection shutdown test");
Status LEDs 5 pcs. (DEVICE – "Control voltage is applied, the soft starter is in good working condition", STATE/BYPASSED – "Overclocking of the electric motor is over" /"Bypass is on", FAILURE – "Error", OVERLOAD – "overload", AUTO /RESET MODE – "Reset mode");
Digital control input IN – "Starting the acceleration of the electric motor";
Programmable digital output of the ON/RUN device – "The device is ready for operation" /"Acceleration/stop mode is started, bypass is on and held" (programming method is given in the manual on page 114);
The digital output of the BYPASSED device is "Overclocking is completed /Bypass contact is enabled";
FAILURE /OVERLOAD status relay – "Error" /"Overload", 1NO+1NZ contact (Contact status diagram for the corresponding emergency and operating conditions is given in the manual on page 54);
Analog input for connecting a PTC temperature sensor from an electric motor (thermal protection);
Screw or spring terminals for connection of power and signal circuits;
For more information about the controls and displays, see the manual on page 80.
Built-in control, control and protection functions of the electric drive
Soft start and stop function of the electric motor;
The function of limiting the starting current of the electric motor;
The function of limiting the starting torque of the electric motor;
The "Remote reset" function;
Status and error monitoring function;
The "Heavy start" function;
The function of protection against network voltage asymmetry;
Thermal protection of the device thyristors;
The electronic protection function of the electric motor (based on measuring the current flowing through the electric motor during operation);
Thermistor protection of the electric motor (measuring the temperature of the electric motor windings using PTC sensors);
The "Standby recovery time" function (the time interval required to restore the normal temperature of the device/electric motor after the thermal protection is triggered);
Overload protection of the electric motor according to the ATEX directive 94/9/EC.
Start-up circuits for explosion-proof electric motors according to ATEX directive 94/9/EC
Fig.1 Protection circuit with contactor; fig.2 Protection circuit with circuit breaker.
Operating modes of Sirius 3RW40 devices and applications
Normal start-up conditions (Class 10): maximum start-up time is 10 seconds, starting current is 300%, 5 starts/hour;
Application: hydraulic pumps, presses, belt conveyors, roller conveyors, screw conveyors, escalators, reciprocating compressors, screw compressors, low-capacity fans, centrifugal fans, drives of auxiliary mechanisms.
Severe start-up conditions (Class 20): maximum start-up time is 10 seconds, starting current is 300%, 5 starts/hour;
Application: agitators, extruders, lathes.
Recommended parameters of Siemens soft starters for various applications
type of equipment | U start /Un, | T start, with | I limit /In | T stop, with | mode/class |
Pumps | 40 | 10 | 3 – 4 | 10 | 10 |
Hydraulic pumps | 40 | 10 | 3 – 4 | 0 | 10 |
The press | 40 | 10 | 5 | 0 | 10 |
Belt conveyors | 70 | 10 | 5 | 5 | 10 |
Roller shutters | 60 | 10 | 5 | 5 | 10 |
Screw conveyors | 50 | 10 | 5 | 5 | 10 |
Escalators | 60 | 10 | 4 | 0 | 10 |
Reciprocating compressors | 40 | 10 | 4 | 0 | 10 |
Screw compressors | 50 | 10 | 4 | 10 | 10 |
Standard fans | 40 | 10 | 4 | 10 | 10 |
Centrifugal blowers | 40 | 10 | 4 | 10 | 10 |
Auxiliary drives | 40 | 10 | 4 | 10 | 10 |
Stirrers, mixers | 40 | 30 | 3 – 4 | 10 | 20 |
Extruders, TPA | 70 | 10 | 5 | 10 | 20 |
Lathes | 40 | 30 | 3 – 4 | 10 | 20 |
Shredders | 40 | 30 | 3 – 4 | 10 | 20 |
Typical schemes for including a softstarter in the power supply and control circuit of an electric motor
Fig.3 Diagram of starting an electric motor with a network contactor; Fig.4 Diagram of starting an electric motor with the implementation of reverse motion.
For the full list of possible options for including soft-start devices in the power supply and control circuit of an asynchronous electric motor, see the manual on page 187.
Designation of the registered number for Siemens Sirius 3RW40 softstarters
3RW | 44 | 24 | - | 1 | B | B | 1 | 4 |
I | II | III |
| IV | V | IV | VII | VIII |
II – model of the Siemens soft starter;
III – Rated operating power and rated operating current
parameter III | Pn, kW | In, And | parameter III | Pn, kW | In, And |
24 | 5,5 | 12,5 | 47 | 55 | 106 |
26 | 11 | 25 | 55 | 75 | 134 |
27 | 15 | 32 | 56 | 90 | 162 |
28 | 18,5 | 38 | 73 | 132 | 230 |
36 | 22 | 45 | 74 | 160 | 280 |
37 | 30 | 63 | 75 | 200 | 356 |
38 | 37 | 72 | 76 | 250 | 432 |
46 | 45 | 80 | - | - | - |
IV – connection type: 1 – screw connection, 2 – for devices of standard size S0 – S5 screw connection of the power circuit /spring connection of the auxiliary circuit, 2 – for devices of standard size S6, S12 bus connection of the power circuit /spring connection of the auxiliary circuit, 6 – bus connection of the power circuit /screw connection of the auxiliary circuit;
V – thermistor protection (B – without protection, C – with thermistor protection);
VI – special function (B – bypass/bypass contactor);
VII – управляющее напряжение Uc:0 – 24 В AC /DC, 1 – 110 – 230 В AC /DC, 3 – 115 В AC, 4 – 230 В AC ;
VIII – operating voltage Ue: 4 – 200...480 V, 5 – 400...600 V.
Nominal characteristics of Siemens soft starter devices of the Sirius 3RW40 series
Operating voltage 200...480V, control voltage 24V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 230V) | Pn, kW (at 400V) | In, And |
3RW4024-1BB04 | 3RW4024-2BB04 | 3,0 | 5,5 | 12,5 |
3RW4026-1BB04 | 3RW4026-2BB04 | 5,5 | 11 | 25 |
3RW4027-1BB04 | 3RW4027-2BB04 | 7,5 | 15 | 32 |
3RW4028-1BB04 | 3RW4028-2BB04 | 11 | 18,5 | 38 |
3RW4036-1BB04 | 3RW4036-2BB04 | 11 | 22 | 45 |
3RW4037-1BB04 | 3RW4037-2BB04 | 18,5 | 30 | 63 |
3RW4038-1BB04 | 3RW4038-2BB04 | 22 | 37 | 72 |
3RW4046-1BB04 | 3RW4046-2BB04 | 22 | 45 | 80 |
3RW4047-1BB04 | 3RW4047-2BB04 | 30 | 55 | 106 |
Operating voltage 200...480V, control voltage 110... 230V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 230V) | Pn, kW (at 400V) | In, And |
3RW4024-1BB14 | 3RW4024-2BB14 | 3,0 | 5,5 | 12,5 |
3RW4026-1BB14 | 3RW4026-2BB14 | 5,5 | 11 | 25 |
3RW4027-1BB14 | 3RW4027-2BB14 | 7,5 | 15 | 32 |
3RW4028-1BB14 | 3RW4028-2BB14 | 11 | 18,5 | 38 |
3RW4036-1BB14 | 3RW4036-2BB14 | 11 | 22 | 45 |
3RW4037-1BB14 | 3RW4037-2BB14 | 18,5 | 30 | 63 |
3RW4038-1BB14 | 3RW4038-2BB14 | 22 | 37 | 72 |
3RW4046-1BB14 | 3RW4046-2BB14 | 22 | 45 | 80 |
3RW4047-1BB14 | 3RW4047-2BB14 | 30 | 55 | 106 |
Operating voltage 400...600V, control voltage 24V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 400V) | Pn, kW (at 500V) | In, And |
3RW4024-1BB05 | 3RW4024-2BB05 | 5,5 | 7,5 | 12,5 |
3RW4026-1BB05 | 3RW4026-2BB05 | 11 | 15 | 25 |
3RW4027-1BB05 | 3RW4027-2BB05 | 15 | 18,5 | 32 |
3RW4028-1BB05 | 3RW4028-2BB05 | 18,5 | 22 | 38 |
3RW4036-1BB05 | 3RW4036-2BB05 | 22 | 30 | 45 |
3RW4037-1BB05 | 3RW4037-2BB05 | 30 | 37 | 63 |
3RW4038-1BB05 | 3RW4038-2BB05 | 37 | 45 | 72 |
3RW4046-1BB05 | 3RW4046-2BB05 | 45 | 55 | 80 |
3RW4047-1BB05 | 3RW4047-2BB05 | 55 | 75 | 106 |
Operating voltage 400...600V, control voltage 110... 230V AC/DC, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 400V) | Pn, kW (at 500V) | In, And |
3RW4024-1BB15 | 3RW4024-2BB15 | 5,5 | 7,5 | 12,5 |
3RW4026-1BB15 | 3RW4026-2BB15 | 11 | 15 | 25 |
3RW4027-1BB15 | 3RW4027-2BB15 | 15 | 18,5 | 32 |
3RW4028-1BB15 | 3RW4028-2BB15 | 18,5 | 22 | 38 |
3RW4036-1BB15 | 3RW4036-2BB15 | 22 | 30 | 45 |
3RW4037-1BB15 | 3RW4037-2BB15 | 30 | 37 | 63 |
3RW4038-1BB15 | 3RW4038-2BB15 | 37 | 45 | 72 |
3RW4046-1BB15 | 3RW4046-2BB15 | 45 | 55 | 80 |
3RW4047-1BB15 | 3RW4047-2BB15 | 55 | 75 | 106 |
Operating voltage 200...480V, control voltage 24V AC/DC, thermistor, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 230V) | Pn, kW (at 400V) | In, And |
3RW4024-1TB04 | 3RW4024-2TB04 | 3,0 | 5,5 | 12,5 |
3RW4026-1TB04 | 3RW4026-2TB04 | 5,5 | 11 | 25 |
3RW4027-1TB04 | 3RW4027-2TB04 | 7,5 | 15 | 32 |
3RW4028-1TB04 | 3RW4028-2TB04 | 11 | 18,5 | 38 |
3RW4036-1TB04 | 3RW4036-2TB04 | 11 | 22 | 45 |
3RW4037-1TB04 | 3RW4037-2TB04 | 18,5 | 30 | 63 |
3RW4038-1TB04 | 3RW4038-2TB04 | 22 | 37 | 72 |
3RW4046-1TB04 | 3RW4046-2TB04 | 22 | 45 | 80 |
3RW4047-1TB04 | 3RW4047-2TB04 | 30 | 55 | 106 |
Operating voltage 400...600V, control voltage 24V AC/DC, thermistor, normal start-up, line connection
Order No. (screw.) | order No. (springs) | Pn, kW (at 400V) | Pn, kW (at 500V) | In, And |
3RW4024-1TB05 | 3RW4024-2TB05 | 5,5 | 7,5 | 12,5 | <
