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. 420-479
Mfr. Part No.3RW4047-1BB14
BrandSiemens
$2,608.84
Each
units
3 200 → 480 V ac 106 A 480 V ac 110 → 230 V ac/dc 55 kW IP00 188mm 70mm 170mm -25°C +60°C - 3RW40
RS Stock No. 746-4965
Mfr. Part No.3RW4055-6BB44
BrandSiemens
$1,612.21
Each
units
3 - 134 A 400 V 230 V ac 75 kW IP00 250mm 120mm 198mm - - - 3RW40
RS Stock No. 420-502
Mfr. Part No.3RW4026-1BB14
BrandSiemens
$728.45
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. 746-4912
Mfr. Part No.3RW3018-1BB04
BrandSiemens
$555.85
Each
units
3 - 17.6 A 400 V 24 V ac/dc 7.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 746-4975
Mfr. Part No.3RW4074-6BB44
BrandSiemens
$4,059.12
Each
units
3 - 280 A 400 V 230 V ac 160 kW IP00 278mm 160mm 230mm - - - 3RW40
RS Stock No. 420-514
Mfr. Part No.3RW4037-1BB14
BrandSiemens
$1,461.33
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. 420-495
Mfr. Part No.3RW4028-1BB14
BrandSiemens
$1,033.39
Each
units
3 200 → 480 V ac 38 A 480 V ac 110 → 230 V ac/dc 18.5 kW IP20 125mm 45mm 154mm -25°C +60°C - 3RW40
RS Stock No. 746-4903
Mfr. Part No.3RW3014-1BB14
BrandSiemens
$347.39
Each
units
3 - 6.5 A 400 V 110 → 230 V ac/dc 3 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 746-4915
Mfr. Part No.3RW3018-1BB14
BrandSiemens
$486.81
Each
units
3 - 17.6 A 400 V 110 → 230 V ac/dc 7.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 746-4971
Mfr. Part No.3RW4073-6BB44
BrandSiemens
$3,720.54
Each
units
3 - 230 A 400 V 230 V ac 132 kW IP00 278mm 160mm 230mm - - - 3RW40
RS Stock No. 746-4906
Mfr. Part No.3RW3013-1BB14
BrandSiemens
$324.10
Each
units
3 - 3.6 A 400 V 110 → 230 V ac/dc 1.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 420-508
Mfr. Part No.3RW4027-1BB14
BrandSiemens
$1,245.70
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. 746-4940
Mfr. Part No.3RW4026-1BB04
BrandSiemens
$633.50
Each
units
3 - 25 A 400 V 24 V ac/dc 11 kW IP20 154mm 45mm 125mm - - - 3RW40
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. 746-4928
Mfr. Part No.3RW3026-1BB14
BrandSiemens
$567.41
Each
units
3 - 25 A 400 V 110 → 230 V ac/dc 11 kW IP20 151mm 45mm 125mm - - - 3RW30
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. 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. 746-4896
Mfr. Part No.3RW3013-1BB04
BrandSiemens
$302.62
Each
units
3 - 3.6 A 400 V 24 V ac/dc 1.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 746-4931
Mfr. Part No.3RW4024-1BB04
BrandSiemens
$617.76
Each
units
3 - 12.5 A 400 V 24 V ac/dc 5.5 kW IP20 154mm 45mm 125mm - - - 3RW40