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
TWD14,364.00
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
TWD23,787.00
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
TWD12,870.00
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. 746-4940
Mfr. Part No.3RW4026-1BB04
BrandSiemens
TWD12,575.00
Each
units
3 - 25 A 400 V 24 V ac/dc 11 kW IP20 154mm 45mm 125mm - - - 3RW40
RS Stock No. 420-524
Mfr. Part No.3RW4038-1BB14
BrandSiemens
TWD27,653.00
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
New
RS Stock No. 200-3974
Mfr. Part No.3RW5073-6TB15
BrandSiemens
TWD83,581.00
Each
units
3 110 → 250 V 250 A 400 → 600 V 110 → 250 V 160 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-4030
Mfr. Part No.3RW5077-2AB15
BrandSiemens
TWD113,973.45
Each
units
3 110 → 250 V 570 A 400 → 600 V 110 → 250 V 355 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3975
Mfr. Part No.3RW5074-2AB04
BrandSiemens
TWD82,821.00
Each
units
3 24 V 315 A 200 → 480 V 24 V 200 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3932
Mfr. Part No.3RW5056-6AB05
BrandSiemens
TWD68,384.00
Each
units
3 24 V 171 A 400 → 600 V 24 V 110 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3984
Mfr. Part No.3RW5074-6AB05
BrandSiemens
TWD91,179.00
Each
units
3 24 V 315 A 400 → 600 V 24 V 200 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9735
Mfr. Part No.3RW5247-6TC04
BrandSiemens
TWD190,135.00
Each
units
3 200 → 480 V 470 A 480 V 24 V ac/dc 400 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9691
Mfr. Part No.3RW5234-6AC04
BrandSiemens
TWD62,159.00
Each
units
3 200 → 480 V 133 A 480 V 24 V ac/dc 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9731
Mfr. Part No.3RW5247-6AC04
BrandSiemens
TWD190,135.00
Each
units
3 200 → 480 V 470 A 480 V 24 V ac/dc 400 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
New
RS Stock No. 200-3958
Mfr. Part No.3RW5073-2AB05
BrandSiemens
TWD83,581.00
Each
units
3 24 V 250 A 400 → 600 V 24 V 160 kW IP00 - - - - - - 3RW50
RS Stock No. 420-491
Mfr. Part No.3RW4024-1BB14
BrandSiemens
TWD10,265.00
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
New
RS Stock No. 200-3935
Mfr. Part No.3RW5056-6TB04
BrandSiemens
TWD61,926.00
Each
units
3 24 V 171 A 200 → 480 V 24 V 110 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9710
Mfr. Part No.3RW5243-6AC14
BrandSiemens
TWD99,942.00
Each
units
3 200 → 480 V 210 A 480 V 110 → 250 V ac 200 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9656
Mfr. Part No.3RW5215-1TC14
BrandSiemens
TWD28,845.00
Each
units
3 200 → 480 V 25 A 480 V 110 → 250 V ac 18.5 kW IP20 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 185-9708
Mfr. Part No.3RW5243-6AC04
BrandSiemens
TWD99,942.00
Each
units
3 200 → 480 V 210 A 480 V 24 V ac/dc 200 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
New
RS Stock No. 200-3933
Mfr. Part No.3RW5056-6AB14
BrandSiemens
TWD61,926.00
Each
units
3 110 → 250 V 171 A 200 → 480 V 110 → 250 V 110 kW IP00 - - - - - - 3RW50