Atlas Copco QAS 25 ID T4F NB Mobile Diesel Generator

The Atlas Copco QAS 25 ID T4F is a 25 kVA Tier 4 Final mobile diesel generator built for rental, telecom, construction, and prime-power applications. Powered by an Isuzu 4LE2T diesel with Tier 4 Final DOC-only after-treatment, integrated fuel containment, and the DeepSea 4520 controller for full diagnostic monitoring. NB = No Brake trailer configuration.

Key Features

• 25 kVA / 20 kW prime power — Tier 4 Final compliant
• Engine: Isuzu 4LE2T diesel with DOC-only after-treatment
• DeepSea 4520 controller — full monitoring & diagnostics
• 110% spill-free fluid containment, 75-gallon polyethylene fuel tank
• Single-axle trailer, no brakes (NB) configuration
• Powder-coated galvannealed steel enclosure, 1400+ hours salt-spray tested
• Long fuel autonomy at 75% load

Ideal Applications

• Rental fleet prime power
• Telecom and broadcast back-up
• Construction site power
• Oil & gas wellhead service
• Event power and emergency standby

Specifications

About the QAS 25 ID T4F NB

The Atlas Copco QAS 25 ID T4F NB supplies mobile diesel power for construction, rental and temporary site work. Multi-voltage output lets you match the generator's electrical configuration to the connected equipment, while the no-brake trailer carries the unit between locations. The sound-attenuated enclosure is rated at 67 dB(A) at 23 ft (7 m) and 75% load. A DeepSea controller provides monitoring and diagnostics, and the service points can be reached from one side when the machine needs maintenance.

How the QAS 25 ID T4F NB compares

The QAS 25 supplies 20 kW / 25 kVA of prime power at 480V three-phase, while the QAS 45 ID T4F NB raises that rating to 36 kW / 45 kVA. Both carry a 75 gal tank, but their published fuel autonomy is 48.2 hours and 31.4 hours respectively. These figures use each machine's own 75% load and 90% of tank volume, so they describe different electrical loads. Match your equipment's power demand to the models in the generator range.

Questions about the QAS 25 ID T4F NB

Is this a 25 kW generator?

It is a 20 kW / 25 kVA prime generator at 480V three-phase, rather than a 25 kW unit. Use the kW rating when adding up the power your equipment needs.

What does T4F mean?

T4F refers to Tier 4 Final engine emissions. This model uses an Isuzu 4LE2T diesel engine and requires ultra-low sulfur diesel.

Is the NB version on a trailer?

The NB version is mounted on a no-brake trailer. It measures 129 x 54 x 66 inches and weighs 2,565 lb wet, ready to operate.

Why Buy From A1 Compressor Warehouse

• Authorized Atlas Copco dealer — full factory warranty support.
• Free application sizing — call (803) 526-5797 or email sales@a1compressorwarehouse.com before you order.
• Same-day quotes on requests received before 3 PM ET. Next-business-day order processing.
• Direct-to-consumer pricing — no middleman markup.