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. 420-502
Mfr. Part No.3RW4026-1BB14
BrandSiemens
HK$3,221.65
Each
units
3 200 → 480 V ac 25 A 480 V ac 110 → 230 V ac/dc 11 kW IP20 154mm 45mm 125mm -25°C +60°C - 3RW40
RS Stock No. 746-4969
Mfr. Part No.3RW4056-6BB34
BrandSiemens
HK$12,172.96
Each
units
3 - 162 A 400 V 115 V ac 90 kW IP00 250mm 120mm 198mm - - - 3RW40
New
RS Stock No. 200-4013
Mfr. Part No.3RW5076-2AB14
BrandSiemens
HK$25,836.77
Each
units
3 110 → 250 V 470 A 200 → 480 V 110 → 250 V 315 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9743
Mfr. Part No.3RW5248-6TC14
BrandSiemens
HK$54,729.07
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
New
RS Stock No. 200-3953
Mfr. Part No.3RW5072-6TB04
BrandSiemens
HK$18,411.22
Each
units
3 24 V 210 A 200 → 480 V 24 V 132 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-4014
Mfr. Part No.3RW5076-2AB15
BrandSiemens
HK$28,481.50
Each
units
3 110 → 250 V 470 A 400 → 600 V 110 → 250 V 315 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9671
Mfr. Part No.3RW5224-1AC04
BrandSiemens
HK$10,384.99
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. 420-495
Mfr. Part No.3RW4028-1BB14
BrandSiemens
HK$4,398.64
Each
units
3 200 → 480 V ac 38 A 480 V ac 110 → 230 V ac/dc 18.5 kW IP20 125mm 45mm 154mm -25°C +60°C - 3RW40
New
RS Stock No. 200-3940
Mfr. Part No.3RW5072-2AB04
BrandSiemens
HK$18,411.22
Each
units
3 24 V 210 A 200 → 480 V 24 V 132 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3905
Mfr. Part No.3RW5055-2AB04
BrandSiemens
HK$14,749.37
Each
units
3 24 V 143 A 200 → 480 V 24 V 90 kW IP00 - - - - - - 3RW50
RS Stock No. 746-4975
Mfr. Part No.3RW4074-6BB44
BrandSiemens
HK$15,191.06
Each
units
3 - 280 A 400 V 230 V ac 160 kW IP00 278mm 160mm 230mm - - - 3RW40
New
RS Stock No. 200-3908
Mfr. Part No.3RW5055-2AB15
BrandSiemens
HK$16,275.12
Each
units
3 110 → 250 V 143 A 400 → 600 V 110 → 250 V 90 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9717
Mfr. Part No.3RW5244-6TC04
BrandSiemens
HK$29,805.06
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. 200-3965
Mfr. Part No.3RW5073-6AB04
BrandSiemens
HK$20,343.88
Each
units
3 24 V 250 A 200 → 480 V 24 V 160 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-4015
Mfr. Part No.3RW5076-2TB04
BrandSiemens
HK$25,836.77
Each
units
3 24 V 470 A 200 → 480 V 24 V 315 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-4027
Mfr. Part No.3RW5077-2AB04
BrandSiemens
HK$27,667.70
Each
units
3 24 V 570 A 200 → 480 V 24 V 355 kW IP00 - - - - - - 3RW50
New
RS Stock No. 200-3927
Mfr. Part No.3RW5056-2TB04
BrandSiemens
HK$16,580.30
Each
units
3 24 V 171 A 200 → 480 V 24 V 110 kW IP00 - - - - - - 3RW50
RS Stock No. 185-9690
Mfr. Part No.3RW5227-1TC14
BrandSiemens
HK$14,019.71
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. 185-9687
Mfr. Part No.3RW5227-1AC14
BrandSiemens
HK$14,019.71
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
New
RS Stock No. 200-3906
Mfr. Part No.3RW5055-2AB05
BrandSiemens
HK$16,275.12
Each
units
3 24 V 143 A 400 → 600 V 24 V 90 kW IP00 - - - - - - 3RW50