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. 185-9659
Mfr. Part No.3RW5216-1AC04
BrandSiemens
TWD32,095.00
Each
units
3 200 → 480 V 32 A 480 V 24 V ac/dc 22 kW IP00 170mm 152mm 274.8mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 785-0751
Mfr. Part No.RSGD4016E0VD20
TWD8,574.00
Each
units
3 - 16 A 400 V ac 110 → 400 V ac 4 kW IP20 125mm 45mm 109.8mm -20°C +60°C - RSGD
RS Stock No. 851-7663
Mfr. Part No.1SFA896115R1100
BrandABB
TWD31,419.00
Each
units
3 600 V 105 A 208 → 600 V ac 24 V ac/dc 55 kW IP10 70mm 180mm 220mm -20°C +60°C - PSR
RS Stock No. 209-6356
BrandRS PRO
TWD5,125.00
Each
units
3 380 → 460 V ac 5.5 A 460 V ac - 2.2 kW IP20 120mm 45mm 75mm 0°C +40°C DIN Rail -
RS Stock No. 330-5358
Mfr. Part No.SSC-25
TWD1,851.00
Each
units
1 230 V ac 25 A 230 V - - - - - - -20°C +85°C - -
RS Stock No. 608-7126
Mfr. Part No.ATS48D88Q
TWD68,194.00
Each
units
3 230 → 415 V 88 A 415 V 220 → 415 V 45 kW IP20 235mm 190mm 290mm -10°C +40°C - ATS48
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
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
RS Stock No. 822-6005
Mfr. Part No.ATS22C11S6
TWD56,433.00
Each
units
3 208 → 600 V 110 A 600 V 230 V 75 kW IP54 150mm 356mm 269.5mm -10°C +40°C - ATS22
RS Stock No. 746-4956
Mfr. Part No.3RW4036-1BB04
BrandSiemens
TWD21,314.00
Each
units
3 - 45 A 400 V 24 V ac/dc 22 kW IP00 170mm 55mm 170mm - - - 3RW40
RS Stock No. 185-9690
Mfr. Part No.3RW5227-1TC14
BrandSiemens
TWD54,847.00
Each
units
3 200 → 480 V 93 A 480 V 110 → 250 V ac 90 kW IP00 185mm 203mm 305.6mm -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
RS Stock No. 185-9704
Mfr. Part No.3RW5236-6AC14
BrandSiemens
TWD85,723.00
Each
units
3 200 → 480 V 171 A 480 V 110 → 250 V ac 160 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 746-4975
Mfr. Part No.3RW4074-6BB44
BrandSiemens
TWD59,711.00
Each
units
3 - 280 A 400 V 230 V ac 160 kW IP00 278mm 160mm 230mm - - - 3RW40
RS Stock No. 820-0700
Mfr. Part No.ATS01N232LU
TWD13,086.00
Each
units
3 200 → 240 V ac 32 A 230 V ac 120 V ac 7.5 kW IP20 45mm 154mm 135mm -10°C +40 (Without Derating) °C, +50 (With Derating) °C - ATS01
RS Stock No. 505-5881
Mfr. Part No.ATSU01N206LT
TWD6,790.00
Each
units
3 200 → 480 V 6 A 480 V 24 V dc 3 kW IP20 113mm 45mm 154mm -10°C +40°C - ATSU01
RS Stock No. 185-9724
Mfr. Part No.3RW5245-6TC14
BrandSiemens
TWD138,132.00
Each
units
3 200 → 480 V 315 A 480 V 110 → 250 V ac 315 kW IP00 210mm 202.5mm 388mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 852-3598
Mfr. Part No.1SFA898108R7000
BrandABB
TWD85,322.00
Each
units
3 100 → 250 V 85 (Inline) A, 147 (Inside Delta) A 208 → 600 V - 45 kW IP10, IP20 150mm 194mm 314mm -20°C +60°C - PSTX
RS Stock No. 185-9730
Mfr. Part No.3RW5246-6TC14
BrandSiemens
TWD161,696.00
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
RS Stock No. 185-9743
Mfr. Part No.3RW5248-6TC14
BrandSiemens
TWD214,105.00
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