ST400 Series Turbine Air Starters are compact, lightweight, high-performance starting solutions for diesel and gas engines where reliable starting in harsh conditions and precise configuration flexibility are required. The ST400 Series is an excellent choice for applications where electric starting is impractical or not recommended, and where a high power-to-weight ratio, fast acceleration and stable operation are essential.

The ST400 Series is based on a turbine motor design, where compressed air (or suitable gas) is directed through a high-speed rotating turbine. This enables strong starting capability with lower mass and a more compact design compared to vane air starters. Turbine technology delivers rapid acceleration, smooth torque output and reduced mechanical wear.

Important: The ST400 Series is not a single fixed model, but a configurable starter platform. Final suitability depends on several parameters, including:

• ARC type (Air Restriction Control)
• Operating pressure
• Gear ratio
• Pinion
• Flange type
• Rotation direction
• Mounting orientation

For this reason, we always recommend selecting the ST400 configuration together with our technical team to ensure perfect engine compatibility and smooth, mechanically safe starting.

ARC (%) – what does it mean?

ARC (Air Restriction Control) defines how much inlet air is used during starting. Different ARC options allow fine-tuning of starter behavior:

• Lower ARC – higher airflow and more aggressive starting
• Higher ARC – more controlled starting and better performance at lower pressure

ST400 Series selection overview (indicative performance)

• ST400 (44% ARC) – higher power capability at higher pressure
• ST455 (55% ARC) – balanced, versatile choice for many industrial engines
• ST499 (99% ARC) – optimized for lower-pressure systems and specific applications

Typical operating pressures and maximum power (indicative):

• ST400 (44% ARC): 6,2 / 8,3 / 10,3 bar → up to 14 / 19 / 25 HP
• ST455 (55% ARC): 4,1 / 6,2 / 8,3 bar → up to 10 / 18 / 23 HP
• ST499 (99% ARC): 2,1 / 4,1 / 6,2 bar → up to 7 / 14 / 26 HP

* Performance values are indicative. Final output depends on selected configuration parameters.

Why choose the ST400 Series turbine air starters?

• Compact and lightweight – easier installation
• Wide configuration flexibility – precise engine matching
• Reliable in harsh environments
• Smooth, mechanically gentle starting

Download the turbine air starter catalogue: