What are the Atlas Copco GA series? Analysis of 7 types of GA series
Choosing the wrong GA model often leads to high energy bills, unstable pressure, or unnecessary maintenance. Many users confuse fixed-speed, VSD, and VSD⁺ models, resulting in poor long-term performance.
The Atlas Copco GA series consists of seven distinct types—GA, GA+, GA VSD, GA VSD⁺, GA VSDˢ, GAFF, and GA FLX—each designed for different load profiles, energy-efficiency targets, and budget levels.
Based on practical selection experience and long-term market use, the following is a clear, structured explanation of each GA type and how they differ.
GA
Fixed-speed, standard industrial screw compressor.
The GA is a traditional fixed-frequency compressor designed for stable, continuous air demand.
This model uses standard cooling and aftercooling, with an Elektronikon sliding-key controller providing basic protection and monitoring. It operates in fixed-speed mode (On/Off or load/unload).
The motor is an IE2 or IE3 asynchronous motor. Energy efficiency is moderate and best suited for applications with stable air consumption.
Key features:
- Simple structure and low maintenance cost
- No frequency converter, fewer failure points
Typical models: GA 15, GA 45, GA 90
局限性: High energy consumption when air demand fluctuates due to unloading losses.
GA+
Enhanced fixed-speed version of the GA.
GA+ improves reliability and cooling but remains a fixed-frequency machine.
It uses an IE4 motor, optimized transmission, and a more efficient compression host with reduced specific power. Cooling is improved to allow cooler operation.
Some older “C” models have been renamed (e.g., GA55C → GA55+). Despite the improvements, GA+ is still not a variable-speed compressor.
Positioning: More reliable and longer-lasting than GA, but not suitable for fluctuating air demand.
Market trend: Gradually phased out as Atlas Copco prioritizes VSD and VSD⁺ platforms.
GA VSD
First-generation variable-speed GA compressor.
GA VSD adjusts motor speed based on real-time air demand to reduce energy waste.
It uses an asynchronous motor with an external frequency converter and Elektronikon® MK4 controller. Pressure stability improves significantly compared to fixed-speed units.
Key advantages:
- 25–35% energy savings vs fixed-speed
- Pressure stability within ±0.1 bar
Typical models: GA 11 VSD, GA 37 VSD
Applications: Packaging, injection molding, and factories with noticeable air demand fluctuations.
GA VSD⁺
New-generation, high-efficiency variable-speed compressor.
GA VSD⁺ represents Atlas Copco’s most advanced GA technology and is the recommended choice for new installations.
It features a permanent magnet synchronous motor (PMSM/IPM) with IE4/IE5 efficiency and the Neos Next intelligent drive system. Both motor and fan are frequency-controlled.
The redesigned compression element reduces specific power by 8–12%. Intelligent temperature control and on-demand condensate discharge further optimize efficiency.
Performance highlights:
- 国际标准化组织 1217 班级 1 energy efficiency
- 到 60% energy savings vs fixed-speed
- 10–15% more efficient than first-generation VSD
- IP54 protection, suitable for dusty environments
Typical models: GA 7 VSD⁺, GA 30 VSD⁺, GA 90 VSD⁺
GA VSDˢ
Intelligent VSD designed for unstable power and wide operating conditions.
GA VSDˢ combines advanced frequency control with strong adaptability to voltage fluctuations.
It uses an optimized asynchronous or permanent magnet motor with a third-generation frequency converter. Elektronikon Touch and SMARTLINK enable remote monitoring and energy analysis.
Key benefits:
- 到 60% energy savings
- Strong adaptability to unstable power grids
- Ideal for developing or emerging markets
GAFF
GA compressor with integrated post-treatment.
GAFF integrates the compressor and dryer into one compact system for clean air output.
Available in fixed-speed or VSD versions, it includes a built-in dryer and FF-grade filtration, delivering air with a 3°C pressure dew point.
Best for: Users who need clean, dry air without installing separate post-treatment equipment.
GA FLX
Two-speed fixed-frequency compressor.
GA FLX balances simplicity and partial energy savings without full VSD complexity.
It operates at two fixed speeds, offering better efficiency than standard fixed-speed models while maintaining mechanical simplicity.
Suitable for: Applications with regular, predictable load changes and limited budgets where fine pressure control is unnecessary.
结论
The Atlas Copco GA series ranges from simple fixed-speed units to advanced VSD⁺ systems. Selecting the right GA type depends on air demand stability, energy cost priorities, power quality, and long-term operating strategy.
