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. 420-508
Mfr. Part No.3RW4027-1BB14
BrandSiemens
TWD14,497.00
Each
units
3 200 → 480 V ac 32 A 480 V ac 110 → 230 V ac/dc 15 kW IP20 154mm 45mm 125mm -25°C +60°C - 3RW40
RS Stock No. 420-514
Mfr. Part No.3RW4037-1BB14
BrandSiemens
TWD23,124.00
Each
units
3 200 480 V ac 63 A 480 V ac 110 230 V ac/dc 30 kW IP00 170mm 55mm 170mm -25°C +60°C - 3RW40
RS Stock No. 420-502
Mfr. Part No.3RW4026-1BB14
BrandSiemens
TWD12,250.00
Each
units
3 200 480 V ac 25 A 480 V ac 110 230 V ac/dc 11 kW IP20 154mm 45mm 125mm -25°C +60°C - 3RW40
RS Stock No. 420-524
Mfr. Part No.3RW4038-1BB14
BrandSiemens
TWD27,047.00
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. 746-4940
Mfr. Part No.3RW4026-1BB04
BrandSiemens
TWD12,005.00
Each
units
3 - 25 A 400 V 24 V ac/dc 11 kW IP20 154mm 45mm 125mm - - - 3RW40
RS Stock No. 185-9684
Mfr. Part No.3RW5226-1TC04
BrandSiemens
TWD50,146.00
Each
units
3 200 480 V 77 A 480 V 24 V ac/dc 75 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9685
Mfr. Part No.3RW5226-1TC14
BrandSiemens
TWD50,146.00
Each
units
3 200 480 V 77 A 480 V 110 250 V ac 75 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 746-4928
Mfr. Part No.3RW3026-1BB14
BrandSiemens
TWD9,174.00
Each
units
3 - 25 A 400 V 110 → 230 V ac/dc 11 kW IP20 151mm 45mm 125mm - - - 3RW30
RS Stock No. 185-9678
Mfr. Part No.3RW5225-1AC04
BrandSiemens
TWD45,662.00
Each
units
3 200 480 V 63 A 480 V 24 V ac/dc 55 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9715
Mfr. Part No.3RW5244-6AC04
BrandSiemens
TWD117,008.00
Each
units
3 200 480 V 250 A 480 V 24 V ac/dc 250 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9682
Mfr. Part No.3RW5226-1AC04
BrandSiemens
TWD50,146.00
Each
units
3 200 480 V 77 A 480 V 24 V ac/dc 75 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 420-520
Mfr. Part No.3RW4046-1BB14
BrandSiemens
TWD30,429.00
Each
units
3 200 480 V ac 80 A 480 V ac 110 230 V ac/dc 45 kW IP00 188mm 70mm 170mm -25°C +60°C - 3RW40
RS Stock No. 185-9638
Mfr. Part No.3RW5213-1AC04
BrandSiemens
TWD23,646.00
Each
units
3 200 480 V 13 A 480 V 24 V ac/dc 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9722
Mfr. Part No.3RW5245-6AC14
BrandSiemens
TWD138,615.00
Each
units
3 200 480 V 315 A 480 V 110 250 V ac 315 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9643
Mfr. Part No.3RW5213-1TC14
BrandSiemens
TWD23,646.00
Each
units
3 200 480 V 13 A 480 V 110 250 V ac 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9705
Mfr. Part No.3RW5236-6TC04
BrandSiemens
TWD86,023.00
Each
units
3 200 480 V 171 A 480 V 24 V ac/dc 160 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9676
Mfr. Part No.3RW5224-1TC04
BrandSiemens
TWD40,769.00
Each
units
3 200 480 V 47 A 480 V 24 V ac/dc 45 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 746-4921
Mfr. Part No.3RW3028-1BB04
BrandSiemens
TWD13,213.00
Each
units
3 - 38 A 400 V 24 V ac/dc 18.5 kW IP20 151mm 45mm 125mm - - - 3RW30
RS Stock No. 420-491
Mfr. Part No.3RW4024-1BB14
BrandSiemens
TWD9,800.00
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. 185-9701
Mfr. Part No.3RW5236-6AC04
BrandSiemens
TWD86,023.00
Each
units
3 200 480 V 171 A 480 V 24 V ac/dc 160 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52