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. 766-2501
Mfr. Part No.DS7-340SX004N0-N
BrandEaton
TWD8,698.00
Each
units
3 230 → 460 V ac 4 A 460 V ac 24 V ac/dc 1.5 kW IP20 45mm 95mm 130mm 0°C +40°C - DS7
New
RS Stock No. 200-3990
Mfr. Part No.3RW5074-6TB14
BrandSiemens
TWD82,820.71
Each
units
3 110 → 250 V 315 A 200 → 480 V 110 → 250 V 200 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3991
Mfr. Part No.3RW5074-6TB15
BrandSiemens
TWD91,178.76
Each
units
3 110 → 250 V 315 A 400 → 600 V 110 → 250 V 200 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3993
Mfr. Part No.3RW5075-2AB05
BrandSiemens
TWD98,776.99
Each
units
3 24 V 370 A 400 → 600 V 24 V 250 kW IP00 - - - - - - 3RW50
RS Stock No. 746-4906
Mfr. Part No.3RW3013-1BB14
BrandSiemens
TWD5,107.00
Each
units
3 - 3.6 A 400 V 110 → 230 V ac/dc 1.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 135-9717
BrandRS PRO
TWD6,712.00
Each
units
2 24 V dc 12 A 400 V ac 24 V dc 5.5 kW IP20 45mm 110mm 121mm 0°C +45°C DIN Rail, Snap-On -
New
RS Stock No. 200-4034
Mfr. Part No.3RW5077-2TB14
BrandSiemens
TWD103,335.93
Each
units
3 110 → 250 V 570 A 200 → 480 V 110 → 250 V 355 kW IP00 - - - - - - 3RW50
RS Stock No. 418-6883
Mfr. Part No.150-C3NBR
TWD10,792.00
Each
units
3 200 → 460 V ac 3 A 460 V ac 24 V ac/dc 1.1 kW IP2X 100mm 44.8mm 139.7mm -5°C +50°C - SMC-3
RS Stock No. 185-9648
Mfr. Part No.3RW5214-1AC14
BrandSiemens
TWD26,001.00
Each
units
3 200 → 480 V 18 A 480 V 110 → 250 V ac 15 kW IP20 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
New
RS Stock No. 200-3921
Mfr. Part No.3RW5055-6TB15
BrandSiemens
TWD60,785.84
Each
units
3 110 → 250 V 143 A 400 → 600 V 110 → 250 V 90 kW IP00 - - - - - - 3RW50
RS Stock No. 136-3705
Mfr. Part No.PFE-10
BrandFairford
TWD7,232.00
Each
units
3 230 → 460 V ac 7.6 A @ 460 V ac, 8.5 A @ 400 V ac 460 V ac 0 → 24 V dc 4 kW @ 400 V ac IP20 55mm 120mm 165mm 0°C +40°C DIN Rail -
RS Stock No. 608-7081
Mfr. Part No.ATS48D38Q
TWD35,659.00
Each
units
3 230 → 415 V 38 A 415 V 220 → 415 V 18.5 kW IP20 190mm 160mm 275mm -10°C +40°C - ATS48
New
RS Stock No. 200-4043
Mfr. Part No.3RW5077-6TB15
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. 200-3948
Mfr. Part No.3RW5072-2TB15
BrandSiemens
TWD75,982.00
Each
units
3 110 → 250 V 210 A 400 → 600 V 110 → 250 V 132 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9655
Mfr. Part No.3RW5215-1TC04
BrandSiemens
TWD28,845.00
Each
units
3 200 → 480 V 25 A 480 V 24 V ac/dc 18.5 kW IP20 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 851-7648
Mfr. Part No.1SFA896111R1100
BrandABB
TWD18,843.00
Each
units
3 600 V 45 A 208 → 600 V ac 24 V ac/dc 22 kW IP10 54mm 153mm 187mm -20°C +60°C - PSR
RS Stock No. 185-9697
Mfr. Part No.3RW5235-6AC14
BrandSiemens
TWD73,942.00
Each
units
3 200 → 480 V 143 A 480 V 110 → 250 V ac 132 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 746-4909
Mfr. Part No.3RW3014-1BB04
BrandSiemens
TWD5,773.00
Each
units
3 - 6.5 A 400 V 24 V ac/dc 3 kW IP20 151mm 45mm 95mm - - - 3RW30
New
RS Stock No. 200-4018
Mfr. Part No.3RW5076-2TB15
BrandSiemens
TWD106,375.22
Each
units
3 110 → 250 V 470 A 400 → 600 V 110 → 250 V 315 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3956
Mfr. Part No.3RW5072-6TB15
BrandSiemens
TWD75,982.00
Each
units
3 110 → 250 V 210 A 400 → 600 V 110 → 250 V 132 kW IP00 - - - - - - 3RW50