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. 852-3611
Mfr. Part No.1SFA898114R7000
BrandABB
$6,333.58
Each
units
3 100 → 250 V 300 (Inline) A, 515 (Inside Delta) A 208 → 600 V - 160 kW IP00, IP20 258mm 276mm 470mm -20°C +60°C - PSTX
New
RS Stock No. 185-9687
Mfr. Part No.3RW5227-1AC14
BrandSiemens
$2,336.54
Each
units
3 200 → 480 V 93 A 480 V 110 → 250 V ac 90 kW IP00 185mm 203mm 305.6mm -25°C +60 Screw Fixing 3RW52
New
RS Stock No. 185-9665
Mfr. Part No.3RW5217-1AC04
BrandSiemens
$1,523.08
Each
units
3 200 → 480 V 38 A 480 V 24 V ac/dc 30 kW IP00 170mm 152mm 274.8mm -25°C +60 Screw Fixing 3RW52
RS Stock No. 746-4921
Mfr. Part No.3RW3028-1BB04
BrandSiemens
$870.36
Each
units
3 - 38 A 400 V 24 V ac/dc 18.5 kW IP20 151mm 45mm 125mm - - - 3RW30
RS Stock No. 820-0716
Mfr. Part No.ATS01N212RT
$284.01
Each
units
3 440 → 480 V ac 12 A 460 V ac 120 V ac - IP20 45mm 154mm 135mm -10°C +40 (Without Derating) °C, +50 (With Derating) °C - ATS01
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Range of PFE soft starters from Fairford. These ...
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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 ...
Range of PFE soft starters from Fairford. These ...
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 ...