Screw blowers up to 110 kW

Unrivalled energy savings – uncompromising efficiency

The future has arrived in low pressure sector: Kaeser innovations such as the world-renowned SIGMA profile rotors offer efficiency gains of up to 35 percent! These reliable performers, which are built for toughness and continuous, trouble-free operation, also ensure maximum savings when it comes to commissioning, operation and maintenance.

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

The new rotor technology benefits customers in the areas of municipal and industrial waste water treatment as well as flotation and fluidisation, where blowers are in constant operation. This makes energy efficiency a key factor.

Your advantages

  • Maximum efficiency of the entire machine:
    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.
  • Minimised 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 guarantees optimal return on investment: Outstanding energy efficiency and maximum compressed air availability combined with a rapid response global service and support network.


Product details



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

Blower airend

High-efficiency blower block with SIGMA profile

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

Bearings and seals

  • Heavy-duty roller bearings for 100% absorption of radial forces
  • Time-tested, maintenance-free sliding ring seal of rotary transmission lead-through on the screw blower block drive shaft

IE3 motor

  • Siemens brand-name product
  • IE3 premium efficiency motor
  • Three PTC thermistors as standard
  • Calibrated 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 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
  • Use of premium quality electric motors
  • Exceptional bearing durability thanks to optimised power distribution in the transmission

Pulsation dampers

  • 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: 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


  • Opening 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 parametrisation is performed at the factory.

Technical specification DBS

The technical specifications can be found in this brochure:

Technical specifications

Standard version

ModelDBS 220 L DBS 220 M EBS 380 L
Max. pressure differential – Gauge pressure mbar 650 1,100 650
Max. usable flow rate m³/min 23 22 38
Max. rated motor power kW 30 37 45
Max. pressure differential – Underpressure mbar - 550 -
Max intake volume m³/min - 22 -
Max. rated motor power kW - 22 -
Connection diameter DN 100 100 150
Dimensions with control cabinet and sound enclosure W x D x H mm 1,110 x 1,480 x 1,670 1,110 x 1,480 x 1,670 1,940 x 1,600 x 1,700
Max. mass kg 820 850 1,400

ModelEBS 380 M FBS 660 L FBS 660 M
Max. pressure differential – Gauge pressure mbar 1,100 650 1,100
Max. usable flow rate m³/min 37 67 66
Max. rated motor power kW 75 90 110
Max. pressure differential – Underpressure mbar 550 - 550
Max intake volume m³/min 38 - 64
Max. rated motor power kW 37 - 75
Connection diameter DN 150 200 200
Dimensions with control cabinet and sound enclosure W x D x H mm 1,940 x 1,600 x 1,700 2,250 x 1,950 x 1,900 2,250 x 1,950 x 1,900
Max. mass kg 1,600 1,850 2,200

Kaeser blowers at Collie WWTP
We love a challenge.

The more challenging, the better!

From the smallest to the largest application, Kaeser customers can rely on decades of engineering experience in finding the right solution. See for yourself.

Reference projects