AS series

AS Series Rotary Screw Compressors (20 to 30 HP)

Industrial-duty efficiency, quiet performance, and low operating costs for medium to large manufacturing demands.

The Kaeser AS Series delivers dependable compressed air for plant applications requiring 67 to 156 cfm at working pressures from 80 to 217 psig. Engineered around Kaeser's energy-saving SIGMA PROFILE® airend and an automatic belt tensioning system, the AS Series provides continuous, 24/7 output with minimal energy input and low maintenance overhead.


Request a Quote | Find a Local Distributor | Download AS Series Specifications (PDF)

 
 

Why Choose the Kaeser AS Series?

Intelligent Control & High-Efficiency Performance

  • SIGMA CONTROL Automation: The SIGMA CONTROL continuously tracks operating metrics, predicts maintenance needs, and integrates with factory management systems or the SIGMA AIR MANAGER 4.0 master controller.
    Standard Anybus Interface: It connects to your PLC or SCADA network via interchangeable communication modules.
    Supported Protocols: Modbus TCP, PROFIBUS DP, PROFINET IO, EtherNet/IP, BACnet/IP, and OPC UA.
  • Power-Saving SIGMA PROFILE® Airend: Precision-machined rotors deliver up to 30% energy savings compared to conventional rotary screw designs.
  • TEFC Motors & Wye-Delta Starter: Totally enclosed fan-cooled (TEFC) motors with Class F insulation come standard with wye-delta reduced-voltage starters to minimize electrical current spikes at startup.

Maintenance-Friendly Drive Transmission

  • Automatic Belt Tensioning Device: Maintains precise belt tension automatically. This eliminates power loss from slippage, extends belt and bearing service life, and lets maintenance personnel inspect belt condition through a side cabinet window.
  • 3-Stage Fluid Separation System: Centrifugal separation combined with dual coalescing filter elements keeps fluid carryover under 2 ppm, protecting downstream air treatment equipment and reducing lubricant consumption.

Space-Saving Cabinet & Low Sound Output

  • Heavy-Gauge Acoustic Enclosure: Sound insulation paneling keeps operating noise between 67 dB(A) and 71 dB(A), allowing installation closer to active production lines.
  • Dual-Flow Fan System: Separate air paths draw cool ambient air for the motor and heat exchangers independently, lowering internal cabinet temperatures and extending fluid and motor life.
  • Single-Panel Access: Key maintenance components—including spin-on fluid filters, air intake cartridges, and oil separator cartridges—are positioned behind a wide door for fast routine servicing.

Integrated Configurations & Package Options

AS 30T - 30 hp screw compressor with dryer

The AS Series offers flexible configurations to meet your specific air quality standards and floor space limitations:

  • Standard AS Models (AS 20, AS 25, AS 30): Base rotary screw compressor unit designed for connection to standalone air treatment and storage equipment.
  • Integrated Dryer "T" Models (AS 20T, AS 25T, AS 30T):Features a built-in refrigerated air dryer housed in a thermally isolated compartment. Includes cycling dryer controls, a zero-loss ECO-DRAIN condensate drain, and eco-friendly R-513A refrigerant.
  • Variable Speed (SFC) Drive Option: Available as an SFC configuration to match fluctuating plant air demand. Learn more on our Variable Speed Drive (SFC) Page.

Technical Specifications

Model Rated Motor Power  [hp] Operating Pressure Range [psig] Capacity Range [cfm] Sound Level [dB(A)] Dimensions W x D x H [in.] Base Unit Weight [lb.]
AS 20/20T 20 hp 80 – 217 psig 67.1 - 109.9 cfm 67 dB(A) 31 1/2" x 43 7/8" x 60 1/4" 1070 lb.
AS 25/25T 25 hp 80 – 217 psig 85.2 - 134.4 cfm 69 dB(A) 1114 lb.
AS 30/30T 30 hp 80 – 217 psig 101.6 - 156.3 cfm 71 dB(A) 1158 lb.
Note: Integrated dryer ("T") configurations alter overall cabinet dimensions and total package weight. Consult the full product brochure for detailed specifications on all configurations. Specifications subject to change without notice.

Typical Applications & Operating Environments for the AS Series

  • Multi-Bay Fabrication & Welding Facilities: Sustains continuous line pressure for shops operating multiple automated welding stations, sandblasting cabinets, and heavy-duty air tools simultaneously. 
  • High-Throughput Packaging & Bottling Lines: Built for two-shift or continuous manufacturing, providing reliable air for case packers, palletizers, and pneumatic sorting lines. 
  • Granite & Stone Fabrication Shops: Delivers dependable power to CNC bridge saws, edge polishers, and water-treatment pneumatic systems in wet, dust-heavy environments.

Browse rotary screw compressors by rated horsepower (HP)

horsepower icon

Our 3-30 hp compressors use a space-savings v-belt drive design and many are available as complete compressed air systems with receiver tanks and integrated dryers. On larger units we use only true direct drive, providing maximum power transfer and efficiency from motor to airend. Options include integrated refrigerated dryers and variable speed drive.

Frequently Asked Questions

What horsepower ratings are available in the Kaeser AS Series?

The AS Series includes 20 HP, 25 HP, and 30 HP models (AS 20, AS 25, and AS 30).

What is the advantage of an AS Series unit with an integrated dryer (T model)?

Integrated dryer ("T") models house a refrigerated air dryer inside the compressor cabinet. The dryer uses a separate thermal compartment to prevent heat transfer from the compressor, delivering dry air while saving floor space and installation costs.

How does the SIGMA CONTROL integrate into factory automation networks?

SIGMA CONTROL 3 uses an Anybus interface to connect directly to industrial control systems. It supports Modbus TCP, PROFIBUS DP, PROFINET IO, EtherNet/IP, BACnet/IP, and OPC UA protocols.

Request a Quote for a Kaeser Compressor

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