ASD series

ASD Series Rotary Screw Compressors (25 to 40 HP)

High-efficiency direct drive, continuous 24/7 reliability, and low sound levels for demanding industrial manufacturing.

The Kaeser ASD Series delivers continuous-duty compressed air for facilities requiring 105 to 1952 cfm at working pressures from 80 to 217 psig. Built with a 1:1 direct drive coupling, premium IE4-class efficiency motors, and power-saving SIGMA PROFILE® airends, the ASD Series delivers maximum volumetric output with minimal power consumption..


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

 
 

Why Choose the Kaeser ASD Series?

Intelligent Automation & System Control

why choose ASD compressors
  • 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.
  • SIGMA PROFILE® Airend: Precision-machined, single-stage flooded rotary screw airends match optimum rotor speed with specific air volume demand for lower energy consumption.
  • Premium Efficiency IE4 Drive Motors: Totally Enclosed Fan Cooled (TEFC) motors with Class F insulation protect internal components against dust and heat while maximizing electrical-to-mechanical conversion efficiency. 
  • Reduced Voltage Wye-Delta Starter: Softens in-rush electrical current spikes during startup for smooth motor acceleration.

Maintenance-Friendly Industrial Design

  • 1:1 Direct Drive Coupling: Connects the drive motor directly to the airend, eliminating belt maintenance, gear transmission losses, and periodic alignment adjustments.
  • External Cooler Placement: Oil and air coolers are mounted on the exterior of the unit, allowing routine cleaning and dust removal without cabinet disassembly. 
  • Two-Stage 1-Micron Air Intake Filtration: Protects internal airend surfaces and fluid pathways from airborne particulates, extending overall fluid and bearing service life.

Acoustic Engineering & Heat Recovery

  • Dual-Zone Radial Airflow: Dedicated radial fans draw ambient intake air separately across cooling coils and drive motors, ensuring optimal operating temperatures while reducing noise down to 66–69 dB(A). 
  • Heat Recovery Ready: Compressing air converts nearly all electrical energy into heat. ASD compressors can be equipped with optional plate-type heat exchangers to recover up to 76% of input energy through cooling fluid (producing hot water up to 160°F), with up to 96% recoverable when combined with ducted exhaust air.

Available Configurations & Package Options

ASD 25T - 25 hp screw compressor
  • Standard ASD Models (ASD 25, ASD 30, ASD 40S, ASD 40): Standalone direct-drive compressor units designed for connection to central plant air distribution. 
  • Integrated Dryer "T" Models (ASD 25T, ASD 30T, ASD 40ST, ASD 40T): Includes an energy-saving refrigerated air dryer housed in a dedicated, thermally isolated cabinet compartment. Equipped with a zero-loss ECO-DRAIN and eco-friendly R-513A refrigerant with low global warming potential.
  • 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.]
ASD 25/25T 25 hp 80 – 125 psig 111 - 113 cfm 66 dB(A) 57 1/2" x 35 3/8" x 60 1/4" 1345 lb.
ASD 30/30T 30 hp 80 – 175 psig 109 - 133 cfm 67 dB(A) 1369 lb.
ASD 40S/40ST 40 hp 80 – 217 psig 105 - 166 cfm 67 dB(A) 1537 lb.
ASD 40/40T 40 hp 80 – 217 psig 122 - 195 cfm 69 dB(A) 1570 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 ASD Series

  • Precision CNC Machining & Job Shops: Supplies steady air for continuous spindle cooling, pneumatic tool clamping, and debris blow-off without pressure drops that cause machining errors. 
  • Automated Assembly & Packaging: Compact enough for localized work cells, providing clean, oil-separated air (under 2 ppm fluid carryover) that protects delicate pneumatic valves, actuators, and packaging machinery. 
  • Commercial Printing & Paper Finishing: Continuous-duty delivery for feed mechanisms, folding equipment, and bindery lines requiring dependable air across extended multi-hour production runs.

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 is the difference between an ASD 40 and an ASD 40S?

Both models feature 40 HP motors. The ASD 40 features a larger airend producing up to 192 cfm at 125 psig, while the ASD 40S delivers 163 cfm at 125 psig with lower unit weight and identical cabinet dimensions.

What are the energy savings of the ASD direct-drive system?

The ASD 1:1 direct coupling connects the motor shaft directly to the airend without intermediate belts or gears, eliminating power transmission losses and extending maintenance intervals.

Can ASD compressors support thermal heat recovery?

Yes. Optional factory-installed plate-type heat exchangers allow up to 76% of electrical input energy to be recovered through cooling fluid to provide water up to 160°F for process or facility heating, with up to 96% recoverable total energy.

Request a Quote for a Kaeser Compressor

Fill out the form below to receive pricing, availability, and configuration options tailored to your facility. Your request will be routed directly to your nearest authorized Kaeser representative.

Fields denoted with an asterisk (*) below are required.

Your information
City / State / ZIP *
Security question
Print page