Carlo Gavazzi 3rd Gen RSBS Soft Starter AC Motor Controllers

Carlo Gavazzi 3rd Generation RSBS Soft Starter AC Motor Controllers are intended to be used with single-phase scroll compressors or phase compressors. Upon applying the control signal, soft starting is achieved within a 600ms interval. At the end of the soft-start function, semiconductors are bypassed by the electromechanical relays. A bi-color LED indicates the full ON state (green) and alarm indication/alarm type in a red user-friendly flashing sequence. The delay between starts and/or from stop-to-start is indicated via an orange LED.


  • Improved thermal design
  • Enclosed solution
  • Integrated current limit
  • Rated operational voltage of 230VACrms, 50/60Hz
  • Rated operational current of up to 32A, AC-53b
  • Integral bypassing of semiconductors
  • Built-in transient overvoltage protection
  • Undervoltage protection after ramp-up
  • DIN rail or panel mount
  • Robust switching algorithm
  • Optional auxiliary alarm relay output
  • Relay Protection
  • UL, cUL listed, and EMC Compliant
  • Optimized algorithm for high-pressure starts
  • Integrated protection against short-cycling
  • Voltage dips and interruptions detection
  • Bi-colour LED for indication of delay between starts and/or alarm


  • Scroll compressors
    • HVAC
      • Heat pumps
    • Marine
      • Air-conditioning
  • Piston compressors
    • Refrigeration
      • Display cabinets
    • Recreational vehicles
      • Air-conditioning


  • Temperature ranges
    • -20°C to +65°C (-4°F to +149°F) operating
    • -30°C to +70°C (-22°F to +158°F) storage
  • IP20 degree of protection
  • <95% relative humidity (non-condensing) at +40°C
  • 1000m altitude
  • Polyamide material
  • 3mA to 6mA input current
  • 15mA current at no load
  • 50/60Hz±5Hz rated AC frequency
  • <200ms response time, input-to-output
  • Voltage
    • 90VAC pick-up
    • 25VAC drop-out
    • 250VACrms rated insulation
    • 230VAC±15% rated operational
  • Green LED supply indication
  • Red LED alarm indication, aux. relay output


Published: 2020-11-03 | Updated: 2022-03-11