Rotary screw compressors with belt drive


Compact design with impressive performance

Kaeser's line of small rotary screw air compressors is suitable for machine shops, auto repair and collision work, and anyone needing an efficient and reliable compressed air system.

Kaeser SX, SM, SK, and AS series of rotary screw compressors with V-belt drive provide outstanding efficiency and reliability. They feature the energy-saving SIGMA profile rotor and integrated SIGMA CONTROL 2 controller. 

  • 3 to 30 hp
  • Pressure: 125, 160, or 217 psig
  • Flow rate: 9 – 143 cfm

Options include:

  • T-Models: Integrated refrigerated dryer for high compressed air quality;
  • SFC Models: Variable speed drive (VSD) to efficiently meet varying demand (SM, SK and AS series).

Not sure which model you need? We're happy to help you determine the right solution. Contact us to get started.

Your advantages

  • Highly-efficient power transmission:
    The quality drive belt with automatic tensioning device ensures consistent transmission efficiency over the life of the unit and reduces maintenance costs.
  • Easy maintenance:
    Maintenance is quick thanks to the removable service panels and easy component access.
  • Exceptionally quiet:
    The soundproofed housing keeps noise levels at a minimum so there's no need to install it in a separate room. In fact, you can have a conversation right next to the compressor.
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.

 

Take a closer look at our belt drive rotary screw compressors

Series comparison
Standard Drive Power range hp Flow rate cfm Pressure psig
SX Multi-ribbed belt 3 - 7.5 9 – 28 125/160/217
SM Multi-ribbed belt 7.5 - 15 19 - 57 125/160/217
SK Multi-ribbed belt 15 – 20 46 - 88 125/160/217
AS Multi- ribbed belt 20 – 30 64 – 141 125/160/217

Find the right compressor

Save money and reduce energy costs by selecting a compressor with just the right amount of power to suit your needs. Ask us – we're happy to help you select the right unit.

SX Series Rotary Screw Compressors – Equipment

Complete unit

SX rotary screw compressor – open
  • Ready-to-run
  • Fully automatic
  • Super silenced
  • Vibration-dampened
  • All panels powder-coated
  • For ambient temperatures up to +115 °F
  • Easy access to all service points thanks to removable left cover

Electric motor

  • IE3 premium efficiency motor
  • Quality German manufacture
  • IP 54

Rotary screw airend

SIGMA PROFILE rotors require approximately 10 to 20 percent less energy than conventional rotors of the same air delivery capacity.

Efficient cooling

  • Dual flow fan and separate air flow channels for cooling of the motor, the fluid/compressed air cooler and the control cabinet
  • Fluid and air flow: 'Honeycomb' air intake filter, pneumatic inlet and venting valves, cooling fluid separator tank with triple separation system
  • Pressure relief valve
  • Minimum pressure check valve
  • Thermostatic valve and fluid filter in coolant circuit
  • Fluid / compressed air combination cooler

Refrigerated dryer (with T version)

  • With electronically-controlled condensate drain
  • Refrigerant compressor with energy-saving, cycling shut-down feature
  • Linked to operational status of the compressor when inactive
  • Alternatively, continuous operation can be selected on site
  • Contains fluorinated greenhouse gas R-513A

Electrical components

  • Control cabinet to IP 54
  • Control cabinet ventilation
  • Automatic star-delta starter
  • Overload relays
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • 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
SM Series Rotary Screw Compressors – Equipment

Complete unit

SM rotary screw compressor – open
  • Ready-to-run
  • Fully automatic
  • Super silenced
  • Vibration-dampened
  • All panels powder-coated
  • For ambient temperatures up to +115 °F

Rotary screw airend

  • Single stage with cooling fluid injection for optimal rotor cooling
  • Genuine KAESER screw compressor airend with the SIGMA PROFILE

Electric motor

  • Premium Efficiency IE3 or IE4
  • Quality German manufacture
  • IP 54

Efficient cooling

  • Dual flow fan and separate air flow channels for cooling of the motor, the fluid/compressed air cooler and the control cabinet
  • Fluid and air flow: 'Honeycomb' air intake filter, pneumatic inlet and venting valves, cooling fluid separator tank with triple separation system
  • Pressure relief valve
  • Minimum pressure check valve
  • Thermostatic valve and fluid filter in coolant circuit
  • Fluid / compressed air combination cooler

Refrigerated dryer (with T version)

  • With electronically-controlled condensate drain
  • Refrigerant compressor with energy-saving, cycling shut-down feature
  • Linked to operational status of the compressor when inactive
  • Alternatively, continuous operation can be selected on site
  • Contains fluorinated greenhouse gas R-513A

Electrical components

  • Control cabinet to IP 54
  • Control cabinet ventilation
  • Automatic star-delta starter
  • Overload relays
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • 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
SK Series Rotary Screw Compressors – Equipment

Complete unit

AIRCENTER SK – removable enclosure cover
  • Ready-to-run
  • Fully automatic
  • Super soundproofing
  • Vibration dampening
  • Powder-coated panels
  • For ambient temperatures up to +115 °F
  • Easy access to all service points

Rotary screw airend

  • Single stage with cooling fluid injection for optimal rotor cooling
  • Genuine KAESER screw compressor airend with the SIGMA PROFILE
  • Multi-ribbed, single belt drive

Electric motor

  • IE3 premium efficiency motor
  • Quality German manufacture
  • IP 54

Efficient cooling

  • Dual flow fan and separate air flow channels for cooling of the motor, the fluid/compressed air cooler and the control cabinet
  • Fluid and air flow: 'Honeycomb' air intake filter, pneumatic inlet and venting valves, cooling fluid separator tank with triple separation system
  • Pressure relief valve
  • Minimum pressure check valve
  • Thermostatic valve and fluid filter in coolant circuit
  • Fluid / compressed air combination cooler

Refrigerated dryer (with T version)

  • With electronically-controlled condensate drain
  • Refrigerant compressor with energy-saving, cycling shut-down feature
  • Linked to operational status of the compressor when inactive
  • Alternatively, continuous operation can be selected on site
  • Contains fluorinated greenhouse gas R-513A

Electrical components

  • Control cabinet to IP 54
  • Control cabinet ventilation
  • Automatic star-delta starter
  • Overload relays
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • 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
AS Series Rotary Screw Compressors – Equipment

Complete unit

  • Ready for operation
  • Fully automatic
  • Super silenced
  • Vibration-dampened
  • All panels powder-coated
  • For ambient temperatures up to +115 °F

Sound insulation

Panels lined with laminated mineral wool

Vibration dampening

  • Anti-vibration mounts
  • Dual anti-vibration mount

Airend

  • Single stage with cooling fluid injection for optimal rotor cooling
  • Genuine KAESER screw compressor airend with the SIGMA PROFILE

Drive

  • V-belt drive with automatic belt tensioning

Electric motor

  • IE3 premium efficiency motor
  • Premium quality German-made motor
  • IP 55
  • Insulation class F for greater power reserve

Electrical components

  • Control cabinet to IP 54
  • Control transformer
  • Siemens frequency converter
  • Volt-free contacts for ventilation control

Fluid and air flow

  • Dry air filter
  • Pneumatic inlet and venting valves
  • Cooling fluid reservoir with three-stage separator system
  • Pressure relief valve
  • Minimum pressure/check valve
  • Thermostatic valve and micro-filter in coolant circuit
  • All fully piped
  • Flexible couplings

Cooling

ASK series details: Energy-saving radial fan
  • Air-cooled
  • Separate aluminum coolers for compressed air and fluid
  • Radial fan meets the high requirements on fan efficiency demanded by the EU Directive 327/2011

Refrigerated dryers

ASK series details: Refrigeration dryer with ECO-DRAIN
  • CFC-free
  • Contains fluorinated greenhouse gas R-513A
  • Fully insulated
  • Hermetically sealed refrigerant circuit
  • Rotary refrigerant compressor with energy-saving, cycling shut-down feature
  • Hot gas bypass control
  • Electronic condensate drain

Heat recovery (HR)

  • Optionally available with integrated heat recovery system (plate-type heat exchanger)

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • 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
Technical specifications SX

Standard version

ModelSX 3 SX 4 SX 5
Working pressure psi 125 160 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 12 9 16 13 9 21 17 13
Max. positive pressure psi 125 160 125 160 217 125 160 217
Nominal motor output hp 3 4 5
Dimensions
W x D x H in 		23 x 25 x 38 23 x 25 x 38 23 x 25 x 38
Compressed air connection¾ NPT ¾ NPT ¾ NPT
Sound pressure level dB(A) 61 62 63
Weight lb 309 309 320

ModelSX 7.5
Working pressure psi 125 160 217
Flow rate complete system at working pressure acfm 28 24 19
Max. positive pressure psi 125 160 217
Nominal motor output hp 7.5
Dimensions
W x D x H in 		23 x 25 x 38
Compressed air connection¾ NPT
Sound pressure level dB(A) 66
Weight lb 342

T version

ModelSX 3 T SX 4 T SX 5 T
Working pressure psi 125 160 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 12 9 16 13 9 21 17 13
Max. positive pressure psi 125 160 125 160 217 125 160 217
Nominal motor output hp 3 4 5
Refrigerated dryerABT 4 ABT 4 ABT 8
Dimensions
W x D x H in 		23 x 36 x 38 23 x 36 x 38 23 x 36 x 38
Compressed air connection¾ NPT ¾ NPT ¾ NPT
Sound pressure level dB(A) 61 62 63
Weight lb 408 408 419

ModelSX 7.5 T
Working pressure psi 125 160 217
Flow rate complete system at working pressure acfm 28 24 19
Max. positive pressure psi 125 160 217
Nominal motor output hp 7.5
Refrigerated dryerABT 8
Dimensions
W x D x H in 		23 x 36 x 38
Compressed air connection¾ NPT
Sound pressure level dB(A) 66
Weight lb 441

Add-on refrigerated dryer

ModelABT 4 ABT 8
Power consumption0.3 0.5
Pressure dew point °F 37 37
RefrigerantR-513A R-513A
Global warming potential — 631 631
Refrigerant volume lb 0.38 0.44
Refrigerant mass as CO2 equivalent t 0.1 0.1
Hermetic refrigeration circuit● ●

Technical specifications SM

Standard version

ModelSM 7.5 SM 10 SM 15
Working pressure psi 125 160 217 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 32 26 19 46 37 28 55 46 36
Max. positive pressure psi 125 160 217 125 160 217 125 160 217
Nominal motor output hp 7.5 10 15
Dimensions
W x D x H in 		25 x 31 x 43 25 x 31 x 43 25 x 31 x 43
Compressed air connection¾ NPT ¾ NPT ¾ NPT
Sound pressure level dB(A) 65 67 68
Weight lb 485 529 529

T version

ModelSM 7.5 T SM 10 T SM 15 T
Working pressure psi 125 160 217 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 32 26 19 46 37 28 55 46 36
Max. positive pressure psi 125 160 217 125 160 217 125 160 217
Nominal motor output hp 7.5 10 15
Refrigerated dryerABT 15 ABT 15 ABT 15
Dimensions
W x D x H in 		25 x 43 x 43 25 x 43 x 43 25 x 43 x 43
Compressed air connection¾ NPT ¾ NPT ¾ NPT
Sound pressure level dB(A) 65 67 68
Weight lb 650 694 694

Add-on refrigerated dryer

ModelABT 15
Power consumption0.5
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 0.77
Refrigerant mass as CO2 equivalent t 0.2
Hermetic refrigeration circuit●

Technical specifications SFC

SFC version

ModelSFC 8
Working pressure psi 125 160 217
Flow rate complete system at working pressure acfm 12 - 48 12 - 41 13 - 31
Max. positive pressure psi 125 160 217
Nominal motor output hp 10
Dimensions
W x D x H in 		25 x 31 x 43
Compressed air connection¾ NPT
Sound pressure level dB(A) 68
Weight lb 551

T-SFC version

ModelSFC 8 T
Working pressure psi 125 160 217
Flow rate complete system at working pressure acfm 12 - 48 12 - 41 13 - 31
Max. positive pressure psi 125 160 217
Nominal motor output hp 10
Refrigerated dryerABT 15
Dimensions
W x D x H in 		25 x 43 x 43
Compressed air connection¾ NPT
Sound pressure level dB(A) 68
Weight lb 717

Add-on refrigerated dryer

ModelABT 15
Power consumption0.5
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 0.77
Refrigerant mass as CO2 equivalent t 0.2
Hermetic refrigeration circuit●

Technical specifications SK

Standard version

ModelSK 15 SK 20
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 71 59 46 88 77 63
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 15 20
Dimensions
W x D x H in 		30 x 35 x 50 30 x 35 x 50
Compressed air connection1 NPT 1 NPT
Sound pressure level dB(A) 67 68
Weight lb 686 703

T version

ModelSK 15 T SK 20T
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 71 59 46 88 77 63
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 15 20
Refrigerated dryerABT 25 ABT 25
Dimensions
W x D x H in 		30 x 49 x 50 30 x 49 x 50
Compressed air connection1 NPT 1 NPT
Sound pressure level dB(A) 67 68
Weight lb 851 869

Add-on refrigerated dryer

ModelABT 25
Power consumption0.6
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 1.37
Refrigerant mass as CO2 equivalent t 0.4
Hermetic refrigeration circuit●

Technical specifications SFC

SFC version

ModelSFC 11 SFC 15
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 22 - 72 22 - 62 19 - 48 28 - 95 29 - 83 28 - 68
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 15 20
Dimensions
W x D x H in 		30 x 35 x 50 30 x 35 x 50
Compressed air connection1 NPT 1 NPT
Sound pressure level dB(A) 68 69
Weight lb 723 741

T-SFC version

ModelSFC 11 T SFC 15 T
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 22 - 72 22 - 62 19 - 48 28 - 95 29 - 83 28 - 68
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 15 20
Refrigerated dryerABT 25 ABT 25
Dimensions
W x D x H in 		30 x 49 x 50 30 x 49 x 50
Compressed air connection1 NPT 1 NPT
Sound pressure level dB(A) 68 69
Weight lb 888 906

Add-on refrigerated dryer

ModelABT 25
Power consumption0.6
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 1.37
Refrigerant mass as CO2 equivalent t 0.4
Hermetic refrigeration circuit●

Technical specifications AS

Standard version

ModelAS 20 AS 25 AS 30
Working pressure psi 125 160 217 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 99 85 64 120 102 85 141 122 100
Max. positive pressure psi 125 160 217 125 160 217 125 160 217
Nominal motor output hp 20 25 30
Dimensions
W x D x H in 		32 x 44 x 60 32 x 44 x 60 32 x 44 x 60
Compressed air connection1¼ NPT 1¼ NPT 1¼ NPT
Sound pressure level dB(A) 67 69 71
Weight lb 1,069 1,113 1,157

T version

ModelAS 20 T AS 25 T AS 30 T
Working pressure psi 125 160 217 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 99 85 64 120 102 85 141 122 100
Max. positive pressure psi 125 160 217 125 160 217 125 160 217
Nominal motor output hp 20 25 30
Refrigerated dryerABT 40 ABT 40 ABT 40
Dimensions
W x D x H in 		32 x 58 x 60 32 x 58 x 60 32 x 58 x 60
Compressed air connection1¼ NPT 1¼ NPT 1¼ NPT
Sound pressure level dB(A) 67 69 71
Weight lb 1,279 1,323 1,367

Add-on refrigerated dryer

ModelABT 40
Power consumption0.9
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 1.26
Refrigerant mass as CO2 equivalent t 0.4
Hermetic refrigeration circuit-

Technical specifications SFC

SFC version

ModelSFC 18S SFC 22S
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 33 - 119 27 - 105 29 - 85 33 - 141 27 - 125 29 - 103
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 25 30
Dimensions
W x D x H in 		32 x 44 x 60 32 x 44 x 60
Compressed air connection1¼ NPT 1¼ NPT
Sound pressure level dB(A) 70 72
Weight lb 1,168 1,213

T-SFC version

ModelSFC 18S T SFC 22S T
Working pressure psi 125 160 217 125 160 217
Flow rate complete system at working pressure acfm 33 - 119 27 - 105 29 - 85 33 - 141 27 - 125 29 - 103
Max. positive pressure psi 125 160 217 125 160 217
Nominal motor output hp 25 30
Refrigerated dryerABT 40 ABT 40
Dimensions
W x D x H in 		32 x 58 x 60 32 x 58 x 60
Compressed air connection1¼ NPT 1¼ NPT
Sound pressure level dB(A) 70 72
Weight lb 1,378 1,422

Add-on refrigerated dryer

ModelABT 40
Power consumption0.9
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 1.26
Refrigerant mass as CO2 equivalent t 0.4
Hermetic refrigeration circuit-

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