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Screw compressors with superior efficiency

Kaeser's direct drive rotary screw compressors range from 25 hp - 650 hp and deliver outstanding performance. Kaeser uses oversized airends specifically selected to produce the required output in flow and pressure. Compared to compressors using small, high speed, gear-driven airends, the one-to-one drive provides significant savings. With Kaeser's one-to-one drive, the airend is directly connected to the motor via a maintenance-free coupling that eliminates transmission losses.
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FSD Series Rotary Screw Air Compressors

FSD 350 Model 350 Horsepower (hp) Nominal Motor Output Standard Version Rotary Screw Air Compressor
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FSD Series Rotary Screw Air Compressors

FSD 450 Model 450 Horsepower (hp) Nominal Motor Output Standard Version Rotary Screw Air Compressor
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Description N/A Screw compressors with superior efficiency

Kaeser's direct drive rotary screw compressors range from 25 hp - 650 hp and deliver outstanding performance. Kaeser uses oversized airends specifically selected to produce the required output in flow and pressure. Compared to compressors using small, high speed, gear-driven airends, the one-to-one drive provides significant savings. With Kaeser's one-to-one drive, the airend is directly connected to the motor via a maintenance-free coupling that eliminates transmission losses.
Brands N/A Kaeser Compressors
Model N/A FSD 350 N/A FSD 450
Working Pressure N/A 125 psi145 psi175 psi N/A 125 psi145 psi175 psi217 psi
Complete System Flow Rate at 125 Pound Per Square Inch (psi) Working Pressure N/A 1596 acfm N/A 2030 acfm
Complete System Flow Rate at 145 Pound Per Square Inch (psi) Working Pressure N/A 1276 acfm N/A 1584 acfm
Complete System Flow Rate at 175 Pound Per Square Inch (psi) Working Pressure N/A 1264 acfm N/A 1567 acfm
Complete System Flow Rate at 217 Pound Per Square Inch (psi) Working Pressure N/A N/A 1243 acfm
Maximum Positive Pressure at 125 Pound Per Square Inch (psi) Working Pressure N/A 125 psi
Maximum Positive Pressure at 145 Pound Per Square Inch (psi) Working Pressure N/A 175 psi
Maximum Positive Pressure at 175 Pound Per Square Inch (psi) Working Pressure N/A 175 psi
Maximum Positive Pressure at 217 Pound Per Square Inch (psi) Working Pressure N/A N/A 217 psi
Nominal Motor Output N/A 350 hp N/A 450 hp
Width N/A 138 in
Depth N/A 85 in
Height N/A 93 in
Compressed Air Connection Thread Size N/A 6 in
Compressed Air Connection Thread Type N/A American National Standards Institute (ANSI) Class 150
Sound Pressure Level N/A 79 dBA N/A 80 dBA
Weight at 125 Pound Per Square Inch (psi) Maximum Positive Pressure N/A 13735 lb N/A 14551 lb
Weight at 175 Pound Per Square Inch (psi) Maximum Positive Pressure N/A 13448 lb N/A 13779 lb
Weight at 217 Pound Per Square Inch (psi) Maximum Positive Pressure N/A N/A 13492 lb
Ambient Temperature N/A Up to +115 ºF
Additional Information N/A Our fluid-injected rotary screw compressors are the perfect choice for industrial compressed air applications. Not sure which model you need? We're happy to help you determine the right solution.
Advantages N/A
  • Exceptional efficiency - IE3 and IE4 motors with premium efficiency performance provide additional energy savings.
  • Longer service life - Electronic thermal management dynamically controls the fluid temperature of our ASD - HSD series for increased energy efficiency. The ETM prevents internal condensation build up, eliminating a common cause of lubricant degradation.
Low Life Cycle Costs N/A Our comprehensive approach to life cycle cost management: Superior efficiency, easy operation, service-friendliness, and a global service and consulting network with fast response times.
Complete Unit N/A
  • Ready to run
  • Fully automatic
  • Super soundproofing
  • Vibration-dampening
  • Powder-coated panels
  • Service-friendly design: External lubrication for fan motor and drive motor bearings
  • Easy access to all service points
Airend N/A
  • Single stage with cooling fluid injection for optimal rotor cooling
  • Genuine KAESER rotary screw airend with energy-saving SIGMA profile
  • 1:1 Direct drive
Drive N/A
  • Directly coupled without gears
  • High-flex, maintenance-free coupling
Cooling Fluid and Air Circuit N/A
  • Dry air intake filter with pre-filtration
  • Inlet silencer
  • Pneumatic inlet and venting valves
  • Cooling fluid separator tank with three-stage separation system
  • Safety relief valve
  • Minimum pressure check valve
Heat Recovery (HR) (Option) N/A
  • Optionally available with integrated fluid/water plate-type heat exchanger and additional fluid thermostatic valve
  • External connections
Electric Motor N/A
  • IE4 super premium efficiency motor
  • IP 55
  • Totally enclosed fan-cooled motor (TEFC)
  • Class F insulation for greater power reserve
  • Pt100 winding temperature transducer for motor monitoring
  • External bearing lubrication
Electrical Components N/A
  • Control cabinet to IP 54
  • Control cabinet ventilation
  • Automatic wye-delta starter
  • Overload relays
  • Control transformer
  • Frequency converter for fan motor
  • Siemens frequency converter (SFC models)
Sigma Control 2 N/A
  • "Traffic-light" LED indicators show operational status at a glance
  • Easy to read display
  • 30 selectable languages
  • Soft-touch keys with icons
  • Fully automated monitoring and control
  • Dual, Quadro, Vario, Dynamic, and Continuous control modes included as standard
  • Interfaces: Ethernet
  • Additional optional communication modules for: Profibus DP, Modbus, Profinet, DeviceNet, and EtherNet/IP
  • SD card slot for data logging and updates
  • RFID reader
  • Web server
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