E. Dold & Söhne GmbH & Co. KG

Tel.: +49 7723 654-0
E-Mail: dold-relays@dold.com

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PF 9029

Softstarter for heating pumps

PF 9029


Auxiliary voltage

Load voltage

Nominal current


  • 0065815
  • PF9029.11 3AC400V UH=AC230V 5-25A
The PF 9029 from the MINISTART-family is a robust electronic control unit for soft starting of... more

Product description

The PF 9029 from the MINISTART-family is a robust electronic control unit for soft starting of compressor motors with integrated monitoring functions. After successful starting the semicon-ductors are bridged by relays to minimize the power dissipation of the units.

Technical specifications

Widths: 67,5 mm
Load voltage up to: 3AC 460 V
For three-phase motors, 400 V up to: 18,5 kW
Auxiliary voltage required: Yes
Signalling output: Yes
Extra functions: Temperature monitoring, Mains monitoring
Type: PF 9029


  • For starting current limitation in heat pumps to provide stable mains conditions
  • Only one small device 67.5 mm for softstart, motor protection, voltage- and phase sequence monitoring
  • Soft start and minimized staring current
  • Extended service life of AC - motors and mechanical drive system
  • Motor power up to 18,5 kW
  • Short ramp up time
    25 A: < 200 ms
    36 A: < 300 ms
  • Energy saving by bridging of the semiconductors after softstart
  • Symmetrical staring current


  • According to IEC/EN 60947-4-2
  • 3-phase controlled with integrated bypass relays
  • Phase sequence monitoring
  • Undervoltage monitoring
  • Overvoltage monitoring
  • Blocked motor monitoring in bypass mode
  • Integrated motor protection to class 10 acc. to IEC/EN 60947-4-2
  • Starting current limitation
  • Thyristor monitoring
  • Detection of missing load
  • Automatic frequency detection of supply voltage
  • Temperature monitoring of power semiconductors