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
New
RS Stock No. 200-4036
Mfr. Part No.3RW5077-6AB04
BrandSiemens
$5,670.24
Each
units
3 24 V 570 A 200 → 480 V 24 V 355 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3961
Mfr. Part No.3RW5073-2TB04
BrandSiemens
$4,169.29
Each
units
3 24 V 250 A 200 → 480 V 24 V 160 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3975
Mfr. Part No.3RW5074-2AB04
BrandSiemens
$4,544.52
Each
units
3 24 V 315 A 200 → 480 V 24 V 200 kW IP00 - - - - - - 3RW50
RS Stock No. 291-3245
Mfr. Part No.BA9018 3AC50/60Hz 400V 1.5kW 12S
BrandDold
$568.08
Each
units
2 400 V ac 3.5 A 400 V 10 → 42 V dc 1.5 kW IP20, IP40 121mm 45mm 74mm 0°C +55°C - BA9018
RS Stock No. 505-5904
Mfr. Part No.ATSU01N212LT
$431.08
Each
units
3 200 → 480 V 12 A 480 V 24 V dc 5.5 kW IP20 113mm 45mm 154mm -10°C +40°C - ATSU01
New
RS Stock No. 200-4024
Mfr. Part No.3RW5076-6TB05
BrandSiemens
$5,837.02
Each
units
3 24 V 470 A 400 → 600 V 24 V 315 kW IP00 - - - - - - 3RW50
RS Stock No. 785-0767
Mfr. Part No.RSGD4025F0VD20
$602.29
Each
units
3 - 25 A 400 V ac 24 V ac/dc 5.5 kW IP20 125mm 45mm 109.8mm -20°C +60°C - RSGD
RS Stock No. 185-9730
Mfr. Part No.3RW5246-6TC14
BrandSiemens
$8,470.68
Each
units
3 200 → 480 V 370 A 480 V 110 → 250 V ac 355 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
New
RS Stock No. 200-4021
Mfr. Part No.3RW5076-6AB14
BrandSiemens
$5,295.00
Each
units
3 110 → 250 V 470 A 200 → 480 V 110 → 250 V 315 kW IP00 - - - - - - 3RW50
RS Stock No. 136-3709
Mfr. Part No.PFE-16
BrandFairford
$888.62
Each
units
3 230 → 460 V ac 14 A @ 460 V ac, 15.5 A @ 400 V ac 460 V ac 0 → 24 V dc 7.5 kW @ 400 V ac IP20 55mm 120mm 165mm 0°C +40°C DIN Rail -
RS Stock No. 710-6405
Mfr. Part No.ATS22D75Q
$1,399.26
Each
units
3 230 → 440 V 75 A 440 V 220 → 230 V 37 kW IP20 247mm 145mm 295mm -10°C +40°C - ATS22
RS Stock No. 746-4953
Mfr. Part No.3RW4038-1BB04
BrandSiemens
$2,439.13
Each
units
3 - 72 A 400 V 24 V ac/dc 37 kW IP00 170mm 55mm 170mm - - - 3RW40
RS Stock No. 181-9090
Mfr. Part No.CHRISTIAN P-4.0/RL/OL
BrandTele
$308.96
Each
units
3 200 → 480 V ac 1.6 → 9 A 200 → 480 V ac 24 V dc 4 kW @ 400 V ac IP20, IP40 - - - 0°C +60°C DIN Rail -
New
RS Stock No. 200-4008
Mfr. Part No.3RW5075-6TB14
BrandSiemens
$4,919.77
Each
units
3 110 → 250 V 370 A 200 → 480 V 110 → 250 V 250 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9693
Mfr. Part No.3RW5234-6TC04
BrandSiemens
$3,256.31
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. 766-2541
Mfr. Part No.DS7-342SX016N0-N
BrandEaton
$675.93
Each
units
3 230 → 460 V ac 16 A 460 V ac 110 → 230 V ac 7.5 kW IP20 45mm 118mm 150mm 0°C +40°C - DS7
New
RS Stock No. 200-3983
Mfr. Part No.3RW5074-6AB04
BrandSiemens
$4,544.52
Each
units
3 24 V 315 A 200 → 480 V 24 V 200 kW IP00 - - - - - - 3RW50
RS Stock No. 785-0754
Mfr. Part No.RSGD4016F0VD20
$410.70
Each
units
3 - 16 A 400 V ac 24 V ac/dc 4 kW IP20 125mm 45mm 109.8mm -20°C +60°C - RSGD
RS Stock No. 746-4912
Mfr. Part No.3RW3018-1BB04
BrandSiemens
$611.44
Each
units
3 - 17.6 A 400 V 24 V ac/dc 7.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 185-9743
Mfr. Part No.3RW5248-6TC14
BrandSiemens
$11,216.22
Each
units
3 200 → 480 V 570 A 480 V 110 → 250 V ac 560 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
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