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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Part Details Brand Stock 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 Series Standards Met Mounting Type
Tele 1.6 → 9 A Soft Start, IP20, IP40, 4 kW @ 400 V ac, 200 → 480 V ac
  • RS Stock No. 181-9090
  • Brand Tele
  • Mfr. Part No. CHRISTIAN P-4.0/RL/OL
Tele 1 3 200 → 480 V ac 1.6 → 9 A 200 → 480 V ac 24 V dc 4 kW @ 400 V ac IP20, IP40 - - - 0°C +60°C - - DIN Rail
Dold 16 A Soft Starter UH9018 Series, IP20, 1.5 kW, 400 V ac
  • RS Stock No. 181-2800
  • Brand Dold
  • Mfr. Part No. UH9018 3AC400V 50/60Hz 1,5kW
Dold 0 3 400 V ac 16 A 400 V ac 10 → 42 V dc 1.5 kW IP20 45mm 121mm 107mm 0°C +45°C UH9018 - DIN Rail
Dold 16 A Soft Starter UH9018 Series, IP20, 7.5 kW, 400 V ac
  • RS Stock No. 181-2801
  • Brand Dold
  • Mfr. Part No. UH9018/100 3AC400V 50/60Hz 7,5kW
Dold 0 3 400 V ac 16 A 400 V ac 10 → 42 V dc 7.5 kW IP20 45mm 121mm 107mm 0°C +45°C UH9018 - DIN Rail
Dold 9 A Soft Starter UG9019 Series, IP20 (Terminal), IP40 (Housing), 4 kW, 200 → 480 V ac
  • RS Stock No. 181-2802
  • Brand Dold
  • Mfr. Part No. UG9019.11/110/61 3AC200-480V 9A 1-10s UH=DC24V
Dold 0 3 200 → 480 V ac 9 A 480 V ac 24 V dc 4 kW IP20 (Terminal), IP40 (Housing) 22.5mm 120.3mm 105mm 0°C +60°C UG9019 - DIN Rail
Dold 9 A Soft Starter UG9256 Series, IP20 (Housing), IP40 (Terminal), 4 kW, 200 → 480 V ac
  • RS Stock No. 181-2799
  • Brand Dold
  • Mfr. Part No. UG9256.11/001/61
Dold 0 3 200 → 480 V ac 9 A 480 V ac 24 V dc 4 kW IP20 (Housing), IP40 (Terminal) 22.5mm 120.3mm 105mm 0°C +60°C UG9256 CE, cULus Listed DIN Rail
Dold 9 A Soft Starter UG9256 Series, IP20 (Terminal), IP40 (Housing), 4 kW, 200 → 480 V ac
  • RS Stock No. 181-2798
  • Brand Dold
  • Mfr. Part No. UG9256.11/61 3AC200-480V 50/60Hz 9,0A UH=DC24V
Dold 0 3 200 → 480 V ac 9 A 480 V ac 24 V dc 4 kW IP20 (Terminal), IP40 (Housing) 22.5mm 120.3mm 105mm 0°C +60°C UG9256 CE Certified, cULus Listed DIN Rail
Siemens 13 A Soft Starter 3RW52 Series, IP20, 11 kW, 200 → 480 V Siemens 0 3 200 → 480 V 13 A 480 V 24 V ac/dc 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 13 A Soft Starter 3RW52 Series, IP20, 11 kW, 200 → 480 V Siemens 0 3 200 → 480 V 13 A 480 V 110 → 250 V ac 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 13 A Soft Starter 3RW52 Series, IP20, 11 kW, 200 → 480 V Siemens 0 3 200 → 480 V 13 A 480 V 110 → 250 V ac 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 13 A Soft Starter 3RW52 Series, IP20, 11 kW, 200 → 480 V Siemens 0 3 200 → 480 V 13 A 480 V 24 V ac/dc 11 kW IP20 170mm 152mm 274.8mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 133 A Soft Starter 3RW52 Series, IP00, 110 kW, 200 → 480 V Siemens 0 3 200 → 480 V 133 A 480 V 110 → 250 V ac 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 133 A Soft Starter 3RW52 Series, IP00, 110 kW, 200 → 480 V Siemens 0 3 200 → 480 V 133 A 480 V 24 V ac/dc 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 133 A Soft Starter 3RW52 Series, IP00, 110 kW, 200 → 480 V Siemens 0 3 200 → 480 V 133 A 480 V 24 V ac/dc 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 133 A Soft Starter 3RW52 Series, IP00, 110 kW, 200 → 480 V Siemens 0 3 200 → 480 V 133 A 480 V 110 → 250 V ac 110 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 143 A Soft Starter 3RW52 Series, IP00, 132 kW, 200 → 480 V Siemens 0 3 200 → 480 V 143 A 480 V 24 V ac/dc 132 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 143 A Soft Starter 3RW52 Series, IP00, 132 kW, 200 → 480 V Siemens 0 3 200 → 480 V 143 A 480 V 110 → 250 V ac 132 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 143 A Soft Starter 3RW52 Series, IP00, 132 kW, 200 → 480 V Siemens 0 3 200 → 480 V 143 A 480 V 24 V ac/dc 132 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 143 A Soft Starter 3RW52 Series, IP00, 132 kW, 200 → 480 V Siemens 0 3 200 → 480 V 143 A 480 V 110 → 250 V ac 132 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 171 A Soft Starter 3RW52 Series, IP00, 160 kW, 200 → 480 V Siemens 0 3 200 → 480 V 171 A 480 V 110 → 250 V ac 160 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
Siemens 171 A Soft Starter 3RW52 Series, IP00, 160 kW, 200 → 480 V Siemens 0 3 200 → 480 V 171 A 480 V 110 → 250 V ac 160 kW IP00 185mm 203mm 305.6mm -25°C +60°C 3RW52 - Screw Fixing
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