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. 135-9718
BrandRS PRO
TWD9,392.00
Each
units
2 10 → 24 V dc 25 A 400 V ac 24 V dc 11 kW IP20 45mm 173mm 158mm 0°C +45°C Snap-On -
RS Stock No. 710-6363
Mfr. Part No.ATS22D17Q
TWD17,403.00
Each
units
3 230 → 440 V 17 A 440 V 220 → 230 V 7.5 kW IP20 209mm 130mm 265mm -10°C +40°C - ATS22
RS Stock No. 185-9685
Mfr. Part No.3RW5226-1TC14
BrandSiemens
TWD49,972.00
Each
units
3 200 → 480 V 77 A 480 V 110 → 250 V ac 75 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 732-8336
Mfr. Part No.1SFA897101R7000
BrandABB
TWD19,967.00
Each
units
3 - 18 A 600 V 100 → 250 V 5.5 kW IP00, IP20 245mm 90mm 185.5mm -25°C +60°C - PSE
RS Stock No. 185-9717
Mfr. Part No.3RW5244-6TC04
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. 847-3973
Mfr. Part No.134939 | DS7-342SX135N0-N
BrandEaton
TWD41,748.00
Each
units
3 230 → 460 V ac 135 A 400 V 110 → 230 V ac 55 kW IP20 108mm 215mm 195mm 0°C +40°C - DS7
RS Stock No. 608-7097
Mfr. Part No.ATS48D47Q
TWD48,096.00
Each
units
3 230 → 415 V 47 A 415 V 220 → 415 V 22 kW IP20 190mm 160mm 275mm -10°C +40°C - ATS48
RS Stock No. 656-6578
Mfr. Part No.1SFA896111R7000
BrandABB
TWD18,916.00
Each
units
3 208 → 600 V 45 A 600 V 100 → 240 V ac 22 kW IP10, IP20 153mm 54mm 187mm -25°C +60°C - PSR
RS Stock No. 851-7626
Mfr. Part No.1SFA896105R1100
BrandABB
TWD6,867.00
Each
units
3 600 V 9 A 208 → 600 V ac 24 V ac/dc 4 kW IP20 45mm 114mm 140mm -20°C +60°C - PSR
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. 185-9694
Mfr. Part No.3RW5234-6TC14
BrandSiemens
TWD62,159.00
Each
units
3 200 → 480 V 133 A 480 V 110 → 250 V ac 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
RS Stock No. 822-6014
Mfr. Part No.ATS22C17S6
TWD87,056.00
Each
units
3 208 → 600 V 170 A 600 V 230 V 110 kW IP54 150mm 356mm 269.5mm -10°C +40°C - ATS22
RS Stock No. 746-4937
Mfr. Part No.3RW3047-1BB04
BrandSiemens
TWD31,477.00
Each
units
3 - 106 A 400 V 24 V ac/dc 55 kW IP20 186mm 70mm 160mm - - - 3RW30
RS Stock No. 375-3791
Mfr. Part No.BL9025 3AC200-480V 50/60Hz 11kW
BrandDold
TWD15,190.00
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. 766-2529
Mfr. Part No.DS7-340SX024N0-N
BrandEaton
TWD14,931.00
Each
units
3 230 → 460 V ac 24 A 460 V ac 24 V ac/dc 11 kW IP20 45mm 118mm 150mm 0°C +40°C - DS7
RS Stock No. 455-5475
Mfr. Part No.3RW3003-2CB54
BrandSiemens
TWD6,722.00
Each
units
3 200 → 400 V ac 3 A 400 V ac 24 → 230 V ac/dc 1.1 kW IP20 120mm 22.5mm 101.6mm -25°C +60°C - 3RW30
RS Stock No. 212-8683
BrandRS PRO
TWD7,898.00
Each
units
3 380 → 460 V ac 5.5 A 460 V ac - 2.2 kW - 120mm 45mm 75mm 0°C +40°C DIN Rail -
RS Stock No. 185-9661
Mfr. Part No.3RW5216-1TC04
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. 185-9688
Mfr. Part No.3RW5227-1TC04
BrandSiemens
TWD54,847.00
Each
units
3 200 → 480 V 93 A 480 V 24 V ac/dc 90 kW IP00 185mm 203mm 305.6mm -25°C +60°C Screw Fixing 3RW52
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 -