Soft Starts

A Soft start motor is a device used typically with electrical AC motors.

How do they work?

They work by helping reduce the torque and load in the power up and electrical current surges that are typical with motors during their start-up phase. The soft start only does this temporary however as it is only needed primarily during start-up

Features and benefits:
•Can control multiple phases of power up


•Control of starting toque in machinery


•Motor power ratings ranging up to 700 kW and above


•Inline contactors are not necessary if the machine it is used on is electrically isolated


•Control starting times of the soft start


•Voltage boost functions available to control over toque


•Can be mounted to DIN, panels or simply snap on capabilities





Where might I use one?
•Smaller size cranes


•Automatic doors/gates


•Fans or pumps


•Conveyor belts


•Compressors

...
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Description Price Phase Supply Voltage Current Rating Voltage Rating Control Voltage Power Rating IP Rating Overall Length Overall Width Overall Depth Minimum Operating Temperature Maximum Operating Temperature Mounting Type Series
RS Stock No. 766-2523
Mfr. Part No.DS7-340SX032N0-N
BrandEaton
$708.32
Each
units
3 230 → 460 V ac 32 A 460 V ac 24 V ac/dc 15 kW IP20 45mm 118mm 150mm 0°C +40°C - DS7
RS Stock No. 851-7663
Mfr. Part No.1SFA896115R1100
BrandABB
$1,526.17
Each
units
3 600 V 105 A 208 → 600 V ac 24 V ac/dc 55 kW IP10 70mm 180mm 220mm -20°C +60°C - PSR
RS Stock No. 123-9758
Mfr. Part No.3PH MS3 11kW
BrandTele
$656.93
Each
units
3 - 70 A 400 V ac - 11 kW IP40 51mm 181mm 141mm -20°C +50°C DIN Rail MS3
RS Stock No. 746-4943
Mfr. Part No.3RW4027-1BB04
BrandSiemens
$1,140.74
Each
units
3 - 32 A 400 V 24 V ac/dc 15 kW IP20 154mm 45mm 125mm - - - 3RW40
RS Stock No. 851-7638
Mfr. Part No.1SFA896107R1100
BrandABB
$396.39
Each
units
3 600 V 16 A 208 → 600 V ac 24 V ac/dc 7.5 kW IP20 45mm 114mm 140mm -20°C +60°C - PSR
RS Stock No. 851-7650
Mfr. Part No.1SFA896113R1100
BrandABB
$985.31
Each
units
3 600 V 72 A 208 → 600 V ac 24 V ac/dc 37 kW IP10 70mm 180mm 220mm -20°C +60°C - PSR
RS Stock No. 766-2548
Mfr. Part No.DS7-342SX012N0-N
BrandEaton
$372.67
Each
units
3 230 → 460 V ac 12 A 460 V ac 110 → 230 V ac 5.5 kW IP20 45mm 95mm 130mm 0°C +40°C - DS7
RS Stock No. 746-4919
Mfr. Part No.3RW3026-1BB04
BrandSiemens
$629.79
Each
units
3 - 25 A 400 V 24 V ac/dc 11 kW IP20 151mm 45mm 125mm - - - 3RW30
RS Stock No. 703-5123
Mfr. Part No.1SFA896113R7000
BrandABB
$1,203.56
Each
units
3 208 → 600 V 72 A 600 V 100 → 240 V ac 37 kW IP10, IP20 180mm 70mm 220mm -25°C +60°C - PSR
RS Stock No. 505-5910
Mfr. Part No.ATSU01N222LT
$357.51
Each
units
3 200 → 480 V 22 A 480 V 24 V dc 11 kW IP20 113mm 45mm 154mm -10°C +40°C - ATSU01
RS Stock No. 420-491
Mfr. Part No.3RW4024-1BB14
BrandSiemens
$478.21
Each
units
3 200 → 480 V ac 12.5 A 480 V ac 110 → 230 V ac/dc 5.5 kW IP20 154mm 45mm 125mm -25°C +60°C - 3RW40
RS Stock No. 420-524
Mfr. Part No.3RW4038-1BB14
BrandSiemens
$1,315.86
Each
units
3 200 → 480 V ac 72 A 480 V ac 110 → 230 V ac/dc 37 kW IP00 170mm 55mm 170mm -25°C +60°C - 3RW40
RS Stock No. 212-8699
BrandRS PRO
$408.92
Each
units
3 380 → 460 V ac 12 A 460 V ac - 5.5 kW - - - - - - DIN Rail -
RS Stock No. 746-4896
Mfr. Part No.3RW3013-1BB04
BrandSiemens
$296.69
Each
units
3 - 3.6 A 400 V 24 V ac/dc 1.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 478-4718
Mfr. Part No.ATS01N112FT
$248.12
Each
units
3 110 → 480 V 12 A 480 V 24 V dc, 110 → 240 V ac 5.5 kW IP20 130.7mm 45mm 145mm -10°C +40°C - ATS01
RS Stock No. 375-3791
Mfr. Part No.BL9025 3AC200-480V 50/60Hz 11kW
BrandDold
$546.08
Each
units
3 200 → 480 V ac 25 A 480 V ac 24 → 480 V ac/dc 15 kW IP20, IP40 121mm 90mm 85mm 0°C +40°C - BL9025
RS Stock No. 851-7641
Mfr. Part No.1SFA896109R1100
BrandABB
$452.13
Each
units
3 600 V 30 A 208 → 600 V ac 24 V ac/dc 15 kW IP20 45mm 128mm 160mm -20°C +60°C - PSR
RS Stock No. 732-8330
Mfr. Part No.1SFA897102R7000
BrandABB
$741.59
Each
units
3 - 25 A 600 V 100 → 250 V 7.5 kW IP00, IP20 245mm 90mm 185.5mm -25°C +60°C - PSE
RS Stock No. 608-7110
Mfr. Part No.ATS48D75Q
$4,143.24
Each
units
3 230 → 415 V 75 A 415 V 220 → 415 V 37 kW IP20 235mm 190mm 290mm -10°C +40°C - ATS48
RS Stock No. 732-8358
Mfr. Part No.1SFA897107R7000
BrandABB
$1,780.87
Each
units
3 - 72 A 600 V 100 → 250 V 30 kW IP00, IP20 245mm 90mm 185.5mm -25°C +60°C - PSE
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Range of PFE soft starters from Fairford. These soft starters are available with ratings from 2.2 kW to 22 kW and are ideally placed to support smaller AC induction motors but can support most AC induction motors. With easy DIN ...
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Description:
Range of PFE soft starters from Fairford. These soft starters are available with ratings from 2.2 kW to 22 kW and are ideally placed to support smaller AC induction motors but can support most AC induction motors. With easy DIN ...
Designed to reduce starting torque for three phase ...
Description:
Designed to reduce starting torque for three phase motors. These units use the principle of controlling one phase of the supply, the others being connected directly to the motor. This has the effect of increased currents in the two non-controlled ...