XG400 - Natural Gas

Select Units


This new rental package delivers optimal performance, produces fewer greenhouse gasses, and provides the features and flexibility to fully meet the needs of the Rental and Petroleum markets.


  • Rating 400 ekW (500 kVA) Continuous 400 ekW (500 kVA) Continuous
  • Frequency 60Hz 60Hz
  • Voltage 208 - 600 V 208 - 600 V


  • Engine CAT CG137-12 TA Gas Engine CAT CG137-12 TA Gas Engine
  • Fuel Natural Gas Natural Gas


  • Width - With Trailer 96.0 in 2438.0 mm
  • Height - With Trailer 162.0 in 4115.0 mm
  • Weight - With Trailer, Lube, Oil and Coolant 39500.0 lb 17917.0 kg


  • Length - With Trailer 9144.0 ml 360.0 in

Fuel/Emissions Strategy

U.S. EPA Tier 2 for Large Non-road Spark-ignition Engines

CAT® CG137-12 TA Gas Engine

  • Robust high speed diesel block design provides prolonged life and lower owning and operating costs.
  • Engine ratings developed to accept low-quality gas down to Cat MN 30

CAT EMCP 4.4 Control Panel

Fully featured power metering, protective relaying, and engine/generator control and monitoring.

Cat Generator

  • Cat SR4B 593 frame generator designed to match performance and output characteristics of the Cat gas engine.
  • Segregated AC/DC, low voltage accessory box provides single point access to accessory connections

CAT Integrated Voltage Regulator (IVR)

Three-phase generator voltage sensing with adjustable volts-per-hertz regulation.


  • 30' ISO high cube container.
  • Sound attenuated air intake louvers
  • Three lockable personnel doors with panic release.
  • Meets 75 dB(A) at 7 meters sound performance per SAE J1074

Distribution Panel

600/346V, 480/277V, 240/139V, 208/120V, 3-phase.

Side Customer Access

Side buss bar access door, external access load connection buss bars.

Internal Lighting

Three internal DC lights with one timer installed at the container door.

Rental Ready Features

  • Anti-condensation heater 110-120 VAC.
  • Coolant heater 110-120 VAC.
  • UL Listed battery charger.

Cooling System

Provides 40 ºC (122 ºF) ambient capability with 0.5 g/bhp-hr NOx per NSPS 2010 at 100% continuous rating.

XG400 - Natural Gas Standard Equipment

20 Amp battery charger

  • UL/CSA listed 120V


  • Single electric starting motor


  • CG137-12 TA

canister-type air cleaner with service indicator

  • Single element

external access load connection buss bars

  • Side buss bar access door

integral oil cooler

  • Pump


  • SR4B 593 frame

Control Panel

  • EMCP 4.4 genset mounted controller

Cooling System

  • Package-mounted radiator with vertical air discharge provides 40ºC ambient capability


    • Sound attenuated 75 dB(A) @ 7 m.
    • 30' ISO high cube container.

Exhaust System

    • Catalyst w/spark arresting muffler
    • Crankcase fumes disposal system

Fuel System

    • Gas pressure regulator.
    • Low pressure fuel system.
    • Methane detection.

Mounting System

  • Generator set soft mounted to container floor


  • Factory testing of standard generator set

News & Events

View the latest company and product news, events and customer stories.


View the latest offers available on a range of Cat® equipment and genuine parts.

Social Media

Connect with us to learn more about our company, products, services and customers.

Branch Locations

With branches across the UK & Ireland, you can be sure that we’re never far away.


Effectively manage your equipment to reduce operating costs and improve efficiency.


Integrated technology can help you understand your equipment's output and help extend its lifespan.


Quick and easy financing with customised payment plans through Cat Financial.