Three Phase Soft Starters

The three phase soft starter connects between the contactor and the motor. Sure-Start3 reduces the starting current and offers a controlled start to limit the damaging start-up and noise in a three phase motor compressor. They are also designed to offer reverse phase protection for motors.

Sure-Start3 soft starter is also designed to learn the motor characteristics of the load. After a few starts, it will have automatically adjusted itself to the load and the electrical supply impedance at the site. Sure-Start3 is designed to function as an auto-start device. Our range of models do not require any auxiliary control input. This makes them much easier to install and are readily compatable with different installations. Contact us if you're interested in purchasing our products or need more information.

Sure-Start soft starters are ETL, CE and RoHS compliant.


Features & Benefits

  • Reduces locked rotor amperage (LRA)/inrush current by up to 40% at startup
  • Reduces Start-up Torque by up to 70% to the motor
  • Voltage protection from brownout and intermittant power failures
  • Automatic optimization of motor current
  • Reduces light flicker
  • Extends life by reducing stress and heating of compressor/motor
  • Allows systems to meet certain utility requirements
  • Auto-Start on power up with no requirement for auxiliary control power
  • Easy installation with minimal wiring required

Motor Protection Functions

  • Low voltage / high voltage shutdown
  • Provides phase reversal protection
  • Delay function limits number of motor starts per hour
  • Internal timing prevents rapid cycling faults
  • Provides brownout protection
  • Prevents fatigue failure of motor bearings, piping and motor foundation structure

Models

  • SS5A04-27SN (460V, 60Hz, 04-27 FLA)
  • SS4A04-34SN (415V, 50Hz, 04-34 FLA)
  • SS3A04-27SN (380V, 50/60Hz, 04-27 FLA)
  • SS2A04-28SN (208-230V, 50/60Hz, 04-28 FLA)

Literature

Video

Specifications

Voltage Ratings (ac) 208-230, 380, 415, or 460 volts
Frequency Models available for 60Hz or 50Hz
Motor Power Ratings (208/230V, 50/60Hz) 2-10 hp
Motor Power Ratings (380V, 50/60Hz) 2-15 hp
Motor Power Ratings (415V 50Hz, 460V 60Hz) 2-20 hp
Starting torque reduction Up to 70% of full load torque
Operating Temperature-4°F to 122°F (-20°C to 50°C)
IP Rating207
Dimensions5.30" x 2.94" x 1.96" (132mm x 72mm x 59mm)
MaterialABS flameproof (UL-94V0)
Software Fault Delay180 seconds
Software OptimizationAuto - Compensates for motor size and supply impedance
Reversal Phase ProtectionYes
Allowable duty cycle20 starts/hr
Initial Power on Delay1 second
Shutdown on Low Voltage (#SS3-A)Less than 195 volts to neutral
Shutdown on Low Voltage (#SS3S/SS3G)Less than 85% of nominal line voltage
Shutdown on High Voltage (#SS3S/SS3G)Above 111%of nominal line voltage
Power Loss Reset100ms detection
EMC ComplianceN2002

Dimensions

Over 250,000 Sure-Starts in use worldwide!