DOL & Star Delta Starters

A DOL Starter is a Direct-On-line motor starter. Sometimes known as an ’across the line’ starter, this type of motor controller is used as a simple starter for larger electric motors, providing full line voltage to the motor terminals.

At their simplest, DOL Starters act as a stop / start switch for a motor, but DOL starters are often fitted with overload protection devices to prevent short circuits or the motor overheating.



Uses for DOL Starters



DOL Starters are used in a variety of applications where motor driving is required, such as running workshop machinery, large fans or water pumps.



Reversible DOL Starters



The RS Range includes reversible DOL Starters that can run a motor either forwards or backwards. These three-button starters are particularly useful for conveyor based machinery, where reversing the direction is sometimes necessary.



Ingress Protection



DOL Starters typically have a moulded plastic body designed to protect the motor starter electrical components from workplace environmental factors. The RS Range includes many DOL starter models that are suitable for the harshest work environments, which is essential when running machinery that results in a dusty environment, such as machine woodworking. There are even ATEX rated DOL starters for environments with explosive risks.



Further Security



Some DOL starters are equipped with securing functions such as key locked buttons. These optional extras are highly useful in preventing accidental or unauthorised activation of a motor, and are available in the RS Range.



What is the difference between dol and star delta starters?



Both devices are used to start induction motors however, where partial voltage is applied to each winding of a star delta starter, a DOL has 100% voltage applied. This also applies to the current, a star delta uses one-third of the starting current that a DOL does. Direct on line starters are the most common and simplest starting method, within a motor start-up they also provide the lowest temperature rise. Star delta starters allow for starting the motor at a lower voltage, making them suitable for high inertias.


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Description Price Power Rating Motor Starter Type Range Voltage Rating IP Rating Current Rating Phase Number of Poles Motor Starter Functionality Reversibility Additional Features Overall Length Enclosure Overall Width
RS Stock No. 665-6261
Mfr. Part No.3RK4353-3LR58-0BA0
BrandSiemens
£277.08
Each
Units
2.2 kW DOL - 400 V ac IP54 - 3 3P Manual - Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 866-6061
Mfr. Part No.3RA6120-1BB32
BrandSiemens
£195.56
Each
Units
0.37 kW DOL - 24 V dc IP20 - 3 3P Automatic, Manual No Highly Efficient Power Wiring And Simplified Motor Connection Infeed System, Integrated Functionalities For Fewer Variants and Maximum System Availability, Time and Space Saving Installation In The Control Cabinet 45mm Yes 170mm
RS Stock No. 665-6252
Mfr. Part No.3RK4353-3HR58-1BA0
BrandSiemens
£327.54
Each
Units
1.1 kW DOL - 400 V ac IP54 - 3 - Manual Yes Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 866-5936
Mfr. Part No.3RA6250-1BB32
BrandSiemens
£334.77
Each
Units
0.37 kW DOL - 24 V dc IP20 - 3 3P Automatic, Manual Yes Highly Efficient Power Wiring And Simplified Motor Connection Infeed System, Integrated Functionalities For Fewer Variants and Maximum System Availability, Time and Space Saving Installation In The Control Cabinet 90mm Yes 170mm
RS Stock No. 665-6258
Mfr. Part No.3RK4353-3HR58-0BA0
BrandSiemens
£277.08
Each
Units
1.1 kW DOL - 400 V ac IP54 - 3 3P Manual Yes Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 665-6268
Mfr. Part No.3RK4353-3PR58-0BA0
BrandSiemens
£289.06
Each
Units
5.5 kW DOL - 400 V ac IP54 - 3 3P Manual - Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 866-5911
Mfr. Part No.3RA6120-1AB32
BrandSiemens
£187.88
Each
Units
0.09 kW DOL - 24 V dc IP20 - 3 3P Automatic, Manual No Highly Efficient Power Wiring And Simplified Motor Connection Infeed System, Integrated Functionalities For Fewer Variants and Maximum System Availability, Time and Space Saving Installation In The Control Cabinet 45mm Yes 170mm
RS Stock No. 665-6264
Mfr. Part No.3RK4353-3LR58-1BA0
BrandSiemens
£327.54
Each
Units
2.2 kW DOL - 400 V ac IP54 - 3 3P Manual Yes Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 665-6277
Mfr. Part No.3RK4353-3PR58-1BA0
BrandSiemens
£356.74
Each
Units
5.5 kW DOL - 400 V ac IP54 - 3 3P Manual Yes Circuit Breaker Included 220mm Yes 182mm
RS Stock No. 177-8918
Mfr. Part No.3RA6120-2DB32
BrandSiemens
£221.19
Each
Units
7.5 kW DOL SIRIUS 690 V IP20 12 A 3 3 - - - 45mm - 165mm
RS Stock No. 184-7090
Mfr. Part No.3RK1308-0CC00-0CP0
BrandSiemens
£231.76
Each
Units
1.1 kW - Simatic 48 → 500 V ac IP20 3 A - 3 - - - 30mm - 166.9mm
RS Stock No. 177-8919
Mfr. Part No.3RA6120-2CB32
BrandSiemens
£211.79
Each
Units
3 kW DOL SIRIUS 690 V IP20 4 A 3 3 - - - 45mm - 165mm
RS Stock No. 177-0977
Mfr. Part No.3RA2110-1AH15-1AP0
BrandSiemens
£102.73
Each
Units
550 W DOL SIRIUS 400 V ac IP20 1.1 1.6 A 3 3 - - - 45mm - 154.9mm
RS Stock No. 184-7091
Mfr. Part No.3RK1308-0CD00-0CP0
BrandSiemens
£242.02
Each
Units
4 kW - Simatic 48 → 500 V ac IP20 9 A - 3 - - - 30mm - 166.9mm
RS Stock No. 177-8920
Mfr. Part No.3RA6120-2EB32
BrandSiemens
£331.36
Each
Units
15 kW DOL SIRIUS 690 V IP20 32 A 3 3 - - - 45mm - 165mm
RS Stock No. 177-0978
Mfr. Part No.3RA2110-1AH15-1BB4
BrandSiemens
£106.71
Each
Units
550 W DOL SIRIUS 400 V ac IP20 1.1 1.6 A 3 3 - - - 45mm - 154.9mm
RS Stock No. 184-7092
Mfr. Part No.3RK1308-0CE00-0CP0
BrandSiemens
£300.18
Each
Units
5.5 kW - Simatic 48 → 500 V ac IP20 12 A - 3 - - - 30mm - 166.9mm
RS Stock No. 177-8921
Mfr. Part No.3RA6120-2CB33
BrandSiemens
£201.55
Each
Units
3 kW DOL SIRIUS 690 V IP20 4 A 3 3 - - - 45mm - 165mm
RS Stock No. 177-8938
Mfr. Part No.3RA6500-2CB43
BrandSiemens
£421.88
Each
Units
3 kW - SIRIUS 690 V IP20 4 A 3 3 - Yes - 90mm - 165mm
RS Stock No. 184-7093
Mfr. Part No.3RK1308-0DB00-0CP0
BrandSiemens
£287.56
Each
Units
0.25 kW Reversing Simatic 48 → 500 V ac IP20 1 A 3 3 - Yes Electronic Overload Protection 30mm - 166.9mm