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. 200-3919
Mfr. Part No.3RW5055-6TB05
BrandSiemens
TWD60,785.84
Each
units
3 24 V 143 A 400 → 600 V 24 V 90 kW IP00 - - - - - - 3RW50
RS Stock No. 325-457
Mfr. Part No.1SFA896103R7000
BrandABB
TWD5,241.00
Each
units
3 208 → 600 V 3.9 A 600 V 100 → 240 V ac 1.5 kW IP20 113.5mm 45mm 140mm -25°C +60°C - PSR
RS Stock No. 852-3609
Mfr. Part No.1SFA898112R7000
BrandABB
TWD136,656.00
Each
units
3 100 → 250 V 210 (Inline) A, 360 (Inside Delta) A 208 → 600 V - 110 kW IP00, IP20 258mm 276mm 470mm -20°C +60°C - PSTX
RS Stock No. 185-9676
Mfr. Part No.3RW5224-1TC04
BrandSiemens
TWD40,627.00
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. 135-9715
BrandRS PRO
TWD5,728.00
Each
units
2 24 V dc 3.5 A 400 V ac 24 V dc 1.5 kW IP20 45mm 110mm 121mm 0°C +45°C DIN Rail, Snap-On -
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
RS Stock No. 152-772
Mfr. Part No.1SFA896109R7000
BrandABB
TWD11,363.00
Each
units
3 208 → 600 V 30 A 600 V 100 → 240 V ac 15 kW IP20 128mm 45mm 160mm -25°C +60°C - PSR
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
RS Stock No. 852-3592
Mfr. Part No.1SFA898109R7000
BrandABB
TWD96,203.00
Each
units
3 100 → 250 V 106 (Inline) A, 181 (Inside Delta) A 208 → 600 V - 55 kW IP10, IP20 150mm 194mm 314mm -20°C +60°C - PSTX
RS Stock No. 478-4774
Mfr. Part No.ATS01N212LU
TWD9,443.00
Each
units
3 200 → 240 V 12 A 240 V 24 V dc, 110 → 240 V ac 3 kW IP20 130.7mm 45mm 145mm -10°C +40°C - ATS01
RS Stock No. 746-4978
Mfr. Part No.3RW4056-6BB44
BrandSiemens
TWD48,002.00
Each
units
3 - 162 A 400 V 230 V ac 90 kW IP00 250mm 120mm 198mm - - - 3RW40
RS Stock No. 746-4915
Mfr. Part No.3RW3018-1BB14
BrandSiemens
TWD8,288.00
Each
units
3 - 17.6 A 400 V 110 → 230 V ac/dc 7.5 kW IP20 151mm 45mm 95mm - - - 3RW30
RS Stock No. 375-3791
Mfr. Part No.BL9025 3AC200-480V 50/60Hz 11kW
BrandDold
TWD15,261.00
Each
units
3 200 → 480 V ac 25 A 480 V ac 24 → 480 V ac/dc 15 kW IP20, IP40 121mm 90mm 85mm 0°C +40°C - BL9025
RS Stock No. 185-9721
Mfr. Part No.3RW5245-6AC04
BrandSiemens
TWD138,132.00
Each
units
3 200 → 480 V 315 A 480 V 24 V ac/dc 315 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
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
RS Stock No. 123-9761
Mfr. Part No.3PH MS3 22kW
BrandTele
TWD18,753.00
Each
units
3 - 140 A 400 V ac - 22 kW IP40 51mm 179mm 224mm -20°C +50°C DIN Rail MS3
RS Stock No. 185-9715
Mfr. Part No.3RW5244-6AC04
BrandSiemens
TWD116,600.00
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
New
RS Stock No. 200-3940
Mfr. Part No.3RW5072-2AB04
BrandSiemens
TWD68,763.98
Each
units
3 24 V 210 A 200 → 480 V 24 V 132 kW IP00 - - - - - - 3RW50
RS Stock No. 420-479
Mfr. Part No.3RW4047-1BB14
BrandSiemens
TWD34,638.00
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. 505-5819
Mfr. Part No.ATS01N109FT
TWD7,150.00
Each
units
3 110 → 480 V 9 A 480 V 24 V dc, 110 → 240 V ac 4 kW IP20 130.7mm 45mm 145mm -10°C +40°C - ATS01