Screw blowers up to 5650 cfm

More air for your money

Kaeser screw blowers use up to 35 percent less energy than conventional rotary blowers and even achieve significant energy savings compared to currently available screw blowers. The combination of a blower airend with high efficiency SIGMA Profile rotors, flow-optimized components, efficient power transmission and drive components ensures exceptional performance, guaranteed by Kaeser in accordance with the stringent requirements of ISO 1217.

  • High-efficiency and low-maintenance blower systems – dual shaft SIGMA blower blocks
  • Optionally available with wye-delta starter (STC) or frequency converter (SFC)
  • Plug-and-play complete package with power supply, SIGMA CONTROL 2 controller, and factory-adjusted belt drive; pre-filled with oil.

Municipal and industrial wastewater, flotation, and fluidization applications stand to benefit from using Kaeser screw blowers. Since these applications require blowers to run constantly, energy efficiency is a key consideration.

Your advantages

  • Maximum package efficiency:
    The combination of SIGMA Profile rotors, optimal motor-to-blower power transmission, and minimal pressure losses for all components ensures exceptional all-round efficiency.
  • Minimal pulsation in the connected process piping:
    Special silencers covering a wide frequency range significantly reduce machine and piping sound.
  • Reduced downtime:
    Highly durable components ensure reliable operation. The smart design eliminates the need for auxiliary devices (e.g. for sealing or cooling). Numerous sensors allow remote monitoring of operating status.
Economical – thanks to low life cycle costs
Life-cycle costs

Our comprehensive approach to life cycle cost management: Superior efficiency, easy operation, service-friendliness, and the latest in technology to keep performance high well into the future.


Product details



These turnkey blowers come complete with sensors, STC/SFC, SIGMA CONTROL 2, an emergency stop switch, are pre-filled with oil, and fully certified.

Blower airend

High-efficiency blower block with SIGMA profile
  • High-efficiency blower airend with SIGMA PROFILE rotors, ensures maximum air delivery with minimal power use

Bearings and seals

  • Heavy-duty roller bearings for 100% absorption of radial forces
  • Time-tested, maintenance-free mechanical drive shaft seal on the screw blower block

IE3 motor

  • Siemens motor
  • IE3 premium efficiency motor
  • Three PTC thermistors as standard
  • Available with SFC frequency controller for variable speed systems
  • Easily accessible, central lubrication port for motors with regreasable bearings for fast and reliable maintenance

Belt drive (EBS/FBS screw blowers)

  • Automatic belt drive with tension indicator
  • Optimum transmission efficiency at all times
  • Reduced maintenance costs
  • Standard V-belt guard with additional belt cooling effect

Direct drive (DBS screw blowers)

  • Integrated gear transmission with near 100% power transmission efficiency
  • Selection of available transmission ratios
  • Premium quality electric motors
  • Exceptional bearing durability thanks to optimized power distribution in the transmission

Pulsation dampeners

  • Efficient inlet and discharge absorption silencers with a wide frequency range to dampen process air pulsations
  • Minimal sound transfer to downstream piping


SIGMA CONTROL 2 – SD card slot
  • Traffic-light LEDs for at-a-glance operational status
  • Easy-to-read display
  • 30 selectable languages
  • Soft-touch icon buttons
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario and Continuous control modes available as standard
  • Interfaces: Ethernet
  • Additional optional communication modules for: EtherNet/IP, Profibus DP, Modbus, Profinet and DeviceNet
  • SD card slot for data logging and updates
  • RFID reader
  • Web server
  • KAESER CONNECT user interface
  • Visual representation of analogue and digital input values
  • Warning and fault messages
  • Graphical display of pressure, temperature and speed trends


  • Web browser
  • Input SC2 IP address and password
  • Access blower control via integrated web server

The user interface shows machine status in real-time, the signals at the analogue and digital inputs, lists warning and fault messages, and graphically displays pressure, temperature and speed trends.


Just plug it in, switch it on and it's ready to go.

 Turnkey blowers: Just plug in and switch on

The turnkey blowers come complete with a frequency converter or Y/D starter, SIGMA CONTROL 2 and emergency stop switch. This significantly reduces the work, costs and risks required for planning, installation, certification, documentation and commissioning.



The version with integrated Y-Δ-starter for constant speed operation is equipped with a premium contactor, overload protection cut-out, and phase loss monitoring. Rounding off the package: the SIGMA CONTROL 2 controller and a reliable emergency stop system.



Using variable speed control, the SFC frequency converter adjusts the flow to match application air demand. Everything is ready for immediate operation, since all programming and parameterization is performed at the factory.

Technical specifications

Standard version

ModelCBS 120 L CBS 120 M DBS 220 L
Max. pressure differential – Gauge pressure psi 9.4 15 9.4
Max. usable flow rate cfm 448 442 812
Max. rated motor power hp 20 30 40
Max. pressure differential – Underpressure psi - 8 -
Max intake volume cfm - 434 -
Max. rated motor power hp - 20 -
Connection diameter DN 80 80 100
Dimensions with control cabinet and sound enclosure W x D x H in 43.7 x 53.8 x 65.7 43.7 x 53.8 x 65.7 43.7 x 58.3 x 65.7
Max. mass lb 1,610 1,653 1,808

ModelDBS 220 M EBS 380 L EBS 380 M
Max. pressure differential – Gauge pressure psi 15 9.4 15
Max. usable flow rate cfm 777 1,342 1,307
Max. rated motor power hp 50 60 100
Max. pressure differential – Underpressure psi 8 - 8
Max intake volume cfm 777 - 1,342
Max. rated motor power hp 30 - 50
Connection diameter DN 100 150 150
Dimensions with control cabinet and sound enclosure W x D x H in 43.7 x 58.3 x 65.7 76.4 x 63 x 66.9 76.4 x 63 x 66.9
Max. mass lb 1,874 3,086 3,527

ModelFBS 660 L FBS 660 M
Max. pressure differential – Gauge pressure psi 9.4 15
Max. usable flow rate cfm 2,366 2,331
Max. rated motor power hp 150 150
Max. pressure differential – Underpressure psi - 8
Max intake volume cfm - 2,260
Max. rated motor power hp - 100
Connection diameter DN 200 200
Dimensions with control cabinet and sound enclosure W x D x H in 88.6 x 76.8 x 74.8 88.6 x 76.8 x 74.8
Max. mass lb 4,079 4,850

Wastewater treatment plant in the town of Kitzingen
Reduce energy consumption and boost air volume!

Reduce energy consumption by more than 20 percent through air system modernisation? You can find out how it's done in the reference story.

Kitzingen reference project